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Top JavaScript Developers

JavaScript powers everything from interactive websites to complex enterprise applications. Partnering with an experienced JavaScript development agency ensures your product is fast, secure, and ready to scale. Clutch makes it easy to find trusted providers by publishing in-depth, verified client reviews and transparent performance data. Use our filters to sort agencies by budget, location, framework expertise, and more. Looking for regional specialists? Browse firms in the United States, United Kingdom, or Canada to compare portfolios and pricing in your market. Start exploring today and shortlist partners that align with your goals.
Ratings Updated: December 28, 2025
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15 Leaders 15 Contenders

21,457 Companies

Programming & Scripting: JavaScript

List of the Top JavaScript Development Companies

  • Featured

    What are Featured Providers?

    Digis, a Fiverr company (NYSE: FVRR) Logotype

    Digis, a Fiverr company (NYSE: FVRR)

    4.9 87 reviews
    Premier Verified
    $5,000+
    $25 - $49 / hr
    50 - 249
    London, England

    Services provided

    50% Web Development
    50% Custom Software Development

    Focus Areas

    10% JavaScript
    10% ASP.NET
    10% C# +7
    10% Java
    10% PHP
    10% Python
    10% Rust
    10% SQL
    10% Scala
    10% Swift

    Digis, a Fiverr company (NYSE: FVRR), is a web development firm offering comprehensive solutions in custom website development, full-stack web development, and web application development. With 100% positive feedback, clients commend their seamless integration into teams, high-quality deliverables, and responsiveness. Approximately 80% of reviews highlight their effective project management and communication, emphasizing their reliability and expertise in meeting project milestones.

    See all 87 projects

    Reviews mention High-quality work

    The overall sentiment regarding the high-quality work delivered by Digis is overwhelmingly positive. Clients consistently praised the exceptional quality of the work, with one noting their 'excellent communication and timely deliverables.' Another client highlighted the 'unique blend of creativity and technical excellence' that set Digis apart. Many reviews emphasized the impressive outcomes achieved, such as increased user engagement and satisfaction, with one stating, 'the quality of their work is of the highest level.' Overall, clients expressed strong satisfaction and confidence in Digis' capabilities.
    • IT Staff Aug & Software Dev for EdTech Company
      5.0 Apr 19, 2024

      We are incredibly impressed with the quality of work and have really appreciated how proactive Digis is. Their work quality, communication skills, and straightforward approach make them an incredibly dependable company you can count on.

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    • Custom Software Development for Digital Marketing Agency
      5.0 Apr 19, 2024

      Their performance throughout the project was exemplary, and they met our expectations at every turn. Their professional approach and the quality of their work were consistently above par, and we look forward to continuing this partnership.

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    • IT Staff Augmentation for Software Dev Company
      5.0 Dec 31, 2023

      We appreciated how DIGIS consistently met deadlines with high-quality work. Overall, they offer excellent value for the price, making them a standout choice.

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    • UI/UX Design, Mobile App & Web Dev for Sports Equipment Co
      5.0 Apr 26, 2023

      All our developers are based in Ukraine, and their work quality is excellent. Digis’ developers have hit every milestone and goal we’ve required, and they’ve done it during the Russian Invasion of Ukraine, which is really impressive.

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    • Mobile App Dev & UI/UX Design for FinTech Startup
      5.0 Jul 24, 2020

      I’m impressed with the quality of their work to date. It’s a very positive experience compared to what I’ve experienced with other technical teams regarding communication, collaboration, and timelines.

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    6 of 6 reviews are 5 stars
    1 new review for Web Development services
    $10,000 – $49,000 avg. project cost

    Reviewed 6 times in the past 6 months

    Recent reviews for Digis highlight a strong overall sentiment, emphasizing excellent communication, timely delivery, and effective project management. Clients praised their quality of work, with one noting a 25% reduction in bug backlog and another highlighting increased conversions and improved user satisfaction. Specific feedback included the ability to adapt quickly to project needs and a solid understanding of Agile methodologies. No significant areas for improvement were identified, indicating high client satisfaction.
    Read 6 Recent Reviews

    Average Project Cost Breakdown

    $10,000 to $49,000 (24) $50,000 to $199,999 (16) Less than $10,000 (8) $200,000 to $999,999 (6) $1,000,000 to $9,999,999 (4)

    What Clients Have Said

    Clients consistently praised Digis for their competitive pricing and strong value for money. Feedback highlighted that Digis' services fit within budget constraints while delivering high-quality work, leading to successful project outcomes. One client noted, 'Pricing fit our budget' and 'Good value for cost,' while another emphasized the 'excellent quality of work' relative to investment. Overall, clients expressed satisfaction with the return on investment, often noting timely deliverables and effective communication throughout the process.
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    United States (27) Germany (7) Ukraine (7) England (4) France (4) Israel (3) South Africa (2) Canada (2) Italy (2) Sweden (2) Spain (2) Ireland (1) Netherlands (1) New Zealand (1) Poland (1) Romania (1) Russia (1) Lithuania (1) Latvia (1) Japan (1) Australia (1) Georgia (1) Scotland (1) Estonia (1)
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  • Rabitech Technologies Pvt Ltd Logotype

    Not yet reviewed

    $1,000+
    < $25 / hr
    10 - 49
    Kochi, India

    Services provided

    25% Web Development
    25% CRM Consulting and SI
    25% E-Commerce Development +1
    25% Mobile App Development

    Focus Areas

    10% JavaScript
    25% PHP
    25% Python +2
    20% AJAX
    20% SQL

    Rabitech Technologies Pvt Ltd is a small CRM consulting and SI company. Founded in 2014, the team offers CRM consulting and SI and E-Commerce Development.

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  • Design Direct UK Logotype

    Not yet reviewed

    $1,000+
    $25 - $49 / hr
    10 - 49
    London, England

    Services provided

    15% Web Development
    15% E-Commerce Development
    15% Mobile App Development +6
    10% CRM Consulting and SI
    10% Custom Software Development
    10% Pay Per Click
    10% Social Media Marketing
    10% UX/UI Design
    5% Search Engine Optimization

    Focus Areas

    10% JavaScript
    20% PHP
    15% ASP.NET +6
    15% SQL
    10% Java
    10% Python
    10% Ruby
    5% AJAX
    5% Other programming & scripting languages

    Launched in 2006, Design Direct UK, a small web development firm, is headquartered in London, England. Their services include Web Development and Mobile App Development.

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  • SureLab Logotype

    Not yet reviewed

    Undisclosed
    Undisclosed
    10 - 49
    Ostrava, Czech Republic

    Services provided

    20% Web Development
    60% Custom Software Development
    10% Mobile App Development +1
    10% Web Design

    Focus Areas

    30% JavaScript
    40% Typescript
    20% Redux +1
    10% PHP

    Founded in 2020, SureLab is a custom software development firm. The small team offers Custom Software Development and Web Development.

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  • Kushagra Infotech Services Logotype

    Not yet reviewed

    $1,000+
    < $25 / hr
    10 - 49
    Lucknow, India

    Services provided

    20% Web Development
    25% Microservices Architecture Services
    20% Mobile App Development +4
    15% Custom Software Development
    10% Web Design
    5% AI Development
    5% Generative AI

    Focus Areas

    30% JavaScript
    25% Kotlin
    25% Swift +3
    10% Redux
    5% Java
    5% Typescript

    Kushagra Infotech Services is a Microservices Architecture Services company. They offer Microservices Architecture Services and Web Development and were established in 2019.

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  • VFMSolution Logotype

    Not yet reviewed

    Undisclosed
    Undisclosed
    50 - 249
    Canton, MI

    Services provided

    20% Web Development
    20% Content Marketing
    20% Graphic Design +2
    20% Search Engine Optimization
    20% Social Media Marketing

    Focus Areas

    20% JavaScript
    30% PHP
    30% jquery +2
    10% AJAX
    10% Python

    VFMSolution is a social media marketing firm. Their midsize team of employees is located in Canton, Michigan. Their team focuses on Social Media Marketing and Content Marketing.

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  • Syllable IT Logotype

    5.0 1 review
    $10,000+
    $25 - $49 / hr
    10 - 49
    Armenia, Colombia

    Services provided

    10% Web Development
    40% IT Staff Augmentation
    10% HR Outsourcing +4
    10% IT Strategy Consulting
    10% Mobile App Development
    10% Robotics Process Automation
    10% Staffing

    Focus Areas

    30% JavaScript
    20% PHP
    10% AJAX +4
    10% HTML5
    10% Python
    10% SQL
    10% Typescript

    Syllable IT provides cloud migration and user interface development services. Reviews highlight their commitment, responsiveness, and ability to meet deadlines. Customers appreciate the high value for cost and the team's dedication to going the extra mile. Overall, Syllable IT is recognized for their effective project management and quality deliverables.

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  • wefixit Logotype

    Not yet reviewed

    $1,000+
    $25 - $49 / hr
    2 - 9
    Patra, Greece

    Services provided

    30% Web Development
    20% Social Media Marketing
    15% Web Design +5
    10% Conversion Optimization
    10% Pay Per Click
    5% Digital Strategy
    5% E-Commerce Development
    5% UX/UI Design

    Focus Areas

    30% JavaScript
    50% PHP
    10% Redux +1
    10% SQL

    In Patra, Greece, wefixit is a website development company. They offer Web Development and Social Media Marketing.

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  • Kapsloc Logotype

    Not yet reviewed

    $5,000+
    $25 - $49 / hr
    2 - 9
    Bordeaux, France

    Services provided

    10% Web Development
    20% Cloud Consulting & SI
    20% Custom Software Development +4
    20% Mobile App Development
    10% AR/VR Development
    10% IoT Development
    10% Web Design

    Focus Areas

    35% JavaScript
    15% C#
    15% C++ +3
    15% UnrealScript
    10% Python
    10% Typescript

    Custom software development firm Kapsloc offers Custom Software Development and Mobile App Development. They were founded in 2023.

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  • YENA Software GmbH Logotype

    YENA Software GmbH

    Not yet reviewed

    $1,000+
    $25 - $49 / hr
    10 - 49

    Services provided

    20% Web Development
    20% Application Management & Support
    20% Branding +2
    20% Marketing Strategy
    20% Mobile App Development

    Focus Areas

    10% JavaScript
    15% C#
    15% Java +5
    15% Objective C
    15% Swift
    10% C
    10% C++
    10% Other programming & scripting languages

    Branding firm YENA Software GmbH is based in VIenna, Austria. Established in 2014, the team offers Branding and Application Management & Support.

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  • Atomkit Logotype

    Not yet reviewed

    $10,000+
    $50 - $99 / hr
    10 - 49
    Amman, Jordan

    Services provided

    10% Web Development
    30% Mobile App Development
    20% AI Development +3
    20% IT Staff Augmentation
    10% AR/VR Development
    10% UX/UI Design

    Focus Areas

    20% JavaScript
    20% C#
    20% PHP +2
    20% SQL
    20% Swift

    Atomkit is a mobile app development firm. Headquartered in Amman, Jordan, the agency provides Mobile App Development and Artificial Intelligence.

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  • eSeller Technologies Pvt Ltd Logotype

    Not yet reviewed

    $1,000+
    $25 - $49 / hr
    10 - 49
    Kazhakkoottam, India

    Services provided

    10% Web Development
    90% E-Commerce Development

    Focus Areas

    20% JavaScript
    40% PHP
    15% AJAX +2
    15% SQL
    10% Java

    ESeller Technologies Pvt Ltd is an e-commerce development firm. Founded in 2014, the team focuses on E-Commerce Development and Web Development.

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  • Homepage Infotech Solutions LLP Logotype

    Not yet reviewed

    $1,000+
    < $25 / hr
    10 - 49
    Indore, India

    Services provided

    20% Web Development
    40% Custom Software Development
    20% Mobile App Development +2
    10% UX/UI Design
    10% Web Design

    Focus Areas

    10% JavaScript
    20% PHP
    10% AJAX +6
    10% ASP.NET
    10% C#
    10% Java
    10% Objective C
    10% SQL
    10% Swift

    Homepage Infotech Solutions LLP is a custom software development firm headquartered in Indore, India. They specialize in Custom Software Development and Web Development and were founded in 2011.

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  • UltraCodes LLC Logotype

    4.9 5 reviews
    $5,000+
    $25 - $49 / hr
    50 - 249
    Lahore, Pakistan

    Services provided

    20% Web Development
    30% Application Testing
    25% Custom Software Development +2
    15% Mobile App Development
    10% E-Commerce Development

    Focus Areas

    35% JavaScript
    35% Python
    30% Java

    https://ultracodes.io/ specializes in Web Development and Web Design, offering services such as software testing and custom web application development. Reviews highlight their professionalism, timely project delivery, and effective communication, with customers appreciating their innovative problem-solving and ability to align technology with business needs. Overall, clients highly recommend them for their expertise and customer-focused approach.

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  • Sierratech Logotype

    5.0 1 review
    $5,000+
    $50 - $99 / hr
    50 - 249
    Stockholm, Sweden

    Services provided

    30% Web Development
    20% AI Development
    20% Blockchain +3
    10% AR/VR Development
    10% Custom Software Development
    10% Low/No Code Development

    Focus Areas

    25% JavaScript
    25% C++
    25% PHP +1
    25% Typescript

    Sierratech offers comprehensive services in Website Development, particularly excelling in secure platform development, web design, and web programming for cryptocurrency exchanges. Overall feedback highlights their cutting-edge technological expertise, proactive communication, and exceptional project management, resulting in robust, user-friendly solutions tailored to client needs. Their focus on security and regulatory compliance ensures trust and reliability, making them a strong candidate for web and online development projects.

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  • AditMicrosys Logotype

    AditMicrosys

    Not yet reviewed

    $5,000+
    < $25 / hr
    50 - 249

    Services provided

    30% Web Development
    30% Mobile App Development
    20% Digital Strategy +1
    20% UX/UI Design

    Focus Areas

    25% JavaScript
    30% Java
    18% ASP.NET +2
    15% PHP
    12% ASP

    AditMicrosys is a mobile app development company. Founded in 1994, their team provides Mobile App Development and Web Development.

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  • Whirly Logotype

    Not yet reviewed

    $10,000+
    $50 - $99 / hr
    50 - 249
    Warszawa, Poland

    Services provided

    25% Web Development
    20% AI Development
    15% Call Center Services +3
    15% Custom Software Development
    15% Mobile App Development
    10% IT Managed Services

    Focus Areas

    30% JavaScript
    40% Java
    20% Kotlin +1
    10% Python

    Midsize custom software development company Whirly, is headquartered in Warszawa, Poland. Their services include Custom Software Development and Web Development.

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  • IMRIEL Technology Solutions Pvt Ltd Logotype

    Not yet reviewed

    $75,000+
    $100 - $149 / hr
    50 - 249
    Pune, India

    Services provided

    40% Web Development
    10% Application Management & Support
    10% IT Managed Services +8
    10% IT Staff Augmentation
    5% Application Testing
    5% Enterprise App Modernization
    5% Mobile App Development
    5% Robotics Process Automation
    5% UX/UI Design
    3% Product Design
    2% AR/VR Development

    Focus Areas

    15% JavaScript
    20% Java
    15% SQL +5
    15% Typescript
    10% ASP.NET
    10% C#
    10% Swift
    5% Python

    IMRIEL Technology Solutions Pvt Ltd is a website development company. Headquartered in Vadodara, India and Pune, India, the team focuses on Web Development and IT managed services.

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  • Kruko Logotype

    Not yet reviewed

    $25,000+
    $50 - $99 / hr
    50 - 249
    Rzeszów, Poland

    Services provided

    20% Web Development
    20% DevOps Managed Services
    15% IT Strategy Consulting +5
    10% AI Development
    10% API Development
    10% Custom Software Development
    10% Low/No Code Development
    5% Mobile App Development

    Focus Areas

    35% JavaScript
    30% Python
    15% SQL +3
    10% C#
    5% Go
    5% Ruby

    Kruko is a Rzeszów, Poland-based custom software development firm. They provide Custom Software Development and Web Development and were established in 2020.

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  • Anthill Logotype

    Not yet reviewed

    Undisclosed
    Undisclosed
    50 - 249
    Sofia, Bulgaria

    Services provided

    20% Web Development
    20% Custom Software Development
    20% IT Staff Augmentation +2
    20% Mobile App Development
    20% Product Design

    Focus Areas

    35% JavaScript
    35% PHP
    30% Java

    Anthill is a Product Design company. The Sofia, Bulgaria-based firm was founded in 2019. Their services include Product Design and IT staff augmentation.

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  • Canary Technology Innovations S.R.L. Logotype

    Not yet reviewed

    $10,000+
    $25 - $49 / hr
    10 - 49
    Ploiești, Romania

    Services provided

    25% Web Development
    25% IoT Development
    25% Mobile App Development +2
    15% Custom Software Development
    10% AR/VR Development

    Focus Areas

    44% JavaScript
    44% C#
    12% SQL

    Canary Technology Innovations S.R.L., a web development firm, was established in 2019. They provides Web Development and Mobile App Development.

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  • Adeocode Logotype

    Not yet reviewed

    $5,000+
    Undisclosed
    2 - 9
    Chicago, IL

    Services provided

    25% Web Development
    25% Custom Software Development
    20% Mobile App Development +2
    15% UX/UI Design
    15% Web Design

    Focus Areas

    30% JavaScript
    30% PHP
    30% SQL +1
    10% Redux

    Founded in 2017, Adeocode is a small Chicago, Illinois-based custom software development firm. Their services include Custom Software Development and Web Development.

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  • Zufaa Inc. Logotype

    5.0 1 review
    $1,000+
    $25 - $49 / hr
    10 - 49
    Brooklyn, NY

    Services provided

    15% Web Development
    20% Search Engine Optimization
    20% UX/UI Design +4
    15% Graphic Design
    10% AR/VR Development
    10% Low/No Code Development
    10% Translation

    Focus Areas

    11% JavaScript
    20% AJAX
    16% PHP +6
    16% SQL
    11% C#
    11% HTML5
    5% Objective C
    5% Python
    5% Visual Basic

    Zufaa Inc. provides web design, digital marketing, and online shop maintenance services. The reviews highlight their ability to deliver visually appealing and user-friendly websites on time, significantly enhancing sales for clients. Their professionalism, responsiveness, and attention to detail are consistently praised, establishing Zufaa Inc. as a reliable choice for software development services.

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  • sixa AG Logotype

    Not yet reviewed

    $10,000+
    $150 - $199 / hr
    10 - 49
    Zürich, Switzerland

    Services provided

    25% Web Development
    25% Digital Strategy
    25% E-Commerce Development +1
    25% UX/UI Design

    Focus Areas

    30% JavaScript
    30% HTML5
    30% PHP +2
    5% SQL
    5% jquery

    Digital Strategy company sixa AG is in Zürich, Switzerland. They provide Digital Strategy and UX/UI Design.

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  • Tathastu Technologies Logotype

    Not yet reviewed

    $1,000+
    $25 - $49 / hr
    10 - 49
    Rajkot, India

    Services provided

    10% Web Development
    10% AR/VR Development
    10% Blockchain +10
    10% Custom Software Development
    10% Customer Service Outsourcing
    10% E-Commerce Development
    10% Mobile App Development
    5% Graphic Design
    5% Logo
    5% Other Marketing
    5% Product Design
    5% UX/UI Design
    5% Web Design

    Focus Areas

    11% JavaScript
    11% AJAX
    11% Kotlin +11
    11% Visual Basic
    6% ASP.NET
    6% Apex
    6% Ember.js
    6% Java
    6% PHP
    6% Python
    6% Redux
    6% Scala
    6% Swift
    2% SQL

    Tathastu Technologies is a custom software development company. In Rajkot, India, the firm was established in 2012. Their services include Custom Software Development and Web Development.

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  • LOGICWAVE Logotype

    Not yet reviewed

    $5,000+
    $50 - $99 / hr
    2 - 9
    Athina, Greece

    Services provided

    20% Web Development
    20% Blockchain
    20% Custom Software Development +2
    20% IoT Development
    20% Mobile App Development

    Focus Areas

    20% JavaScript
    35% PHP
    25% Python +1
    20% SQL

    LOGICWAVE is an Athina, Greece-based custom software development firm. They provide Custom Software Development and Web Development and were founded in 2024.

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  • Zepto Systems Ltd Logotype

    Not yet reviewed

    $25,000+
    $25 - $49 / hr
    50 - 249
    Islamabad, Pakistan

    Services provided

    10% Web Development
    20% Application Management & Support
    20% Mobile App Development +5
    10% AI Development
    10% AR/VR Development
    10% Application Testing
    10% Custom Software Development
    10% E-Commerce Development

    Focus Areas

    11% JavaScript
    16% C#
    16% Java +9
    11% PHP
    11% SQL
    5% Go
    5% Kotlin
    5% Python
    5% Redux
    5% Ruby
    5% Swift
    5% Typescript

    Zepto Systems Ltd, an Application Management & Support company, is located in London, England and Islamabad, Pakistan. They offer Application Management & Support and Mobile App Development.

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  • Bhartitech Logotype

    Not yet reviewed

    $1,000+
    < $25 / hr
    250 - 999
    Chandigarh, India

    Services provided

    10% Web Development
    20% Conversion Optimization
    20% Search Engine Optimization +4
    20% Web Design
    10% Application Testing
    10% Email Marketing
    10% Pay Per Click

    Focus Areas

    20% JavaScript
    15% PHP
    15% Python +4
    15% Ruby
    15% SQL
    10% HTML5
    10% Java

    Bhartitech is a Conversion Optimization company established in 2015. Their team offers Conversion Optimization and Search Engine Optimization.

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  • OPTIALL sp. z o.o. Logotype

    OPTIALL sp. z o.o.

    Not yet reviewed

    Undisclosed
    $50 - $99 / hr
    2 - 9

    Services provided

    15% Web Development
    20% IT Strategy Consulting
    15% Custom Software Development +5
    10% API Development
    10% Application Management & Support
    10% Low/No Code Development
    10% UX/UI Design
    10% Web Design

    Focus Areas

    15% JavaScript
    20% Python
    15% Redux +8
    10% AJAX
    10% HTML5
    5% Java
    5% PHP
    5% Perl
    5% SQL
    5% Typescript
    5% XML

    OPTIALL sp. Z o.o. Is a software development firm launched in 2019. Their team offers Custom Software Development and IT strategy consulting.

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  • Devforia Logotype

    Not yet reviewed

    $1,000+
    $50 - $99 / hr
    Freelancer
    Austin, TX

    Services provided

    25% Web Development
    25% Custom Software Development
    25% Mobile App Development +1
    25% Web Design

    Focus Areas

    40% JavaScript
    20% Python
    10% C# +3
    10% Other programming & scripting languages
    10% PHP
    10% SQL

    Devforia is a web design agency. In Austin, Texas, the team focuses on Web Design and Custom Software Development.

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  • Hawkeye Design Logotype

    Not yet reviewed

    Undisclosed
    $50 - $99 / hr
    2 - 9
    Earls Barton, England

    Services provided

    30% Web Development
    15% Web Design
    10% Digital Strategy +6
    10% Email Marketing
    10% Low/No Code Development
    10% Search Engine Optimization
    5% Graphic Design
    5% Logo
    5% UX/UI Design

    Focus Areas

    25% JavaScript
    55% PHP
    15% SQL +1
    5% Ember.js

    Hawkeye Design is a website development company. Founded in 2010, the team specializes in Web Development and Web Design. The company is based in Earls Barton, England.

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  • Portox Logotype

    5.0 1 review
    $5,000+
    $100 - $149 / hr
    2 - 9
    Porto, Portugal

    Services provided

    10% Web Development
    30% E-Commerce Development
    20% Digital Strategy +3
    20% Mobile App Development
    10% IT Strategy Consulting
    10% Low/No Code Development

    Focus Areas

    10% JavaScript
    40% Python
    30% Typescript +2
    10% HTML5
    10% SQL

    Portox offers specialized services in Website Development and Web Design, showcasing expertise in crafting MVPs and product strategies. The reviews highlight their proactive project management, impressive product skill set, and the ability to deliver timely results, contributing to successful investment rounds. Their professionals, with backgrounds in leading tech companies, provide valuable expertise in Web Programming and Online Development.

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  • PARALOGIK Logotype

    Not yet reviewed

    $5,000+
    $50 - $99 / hr
    2 - 9
    Marrakech, Morocco

    Services provided

    30% Web Development
    30% Custom Software Development
    15% Search Engine Optimization +2
    15% UX/UI Design
    10% IoT Development

    Focus Areas

    60% JavaScript
    40% PHP

    PARALOGIK, a software development firm, is based in Marrakech, Morocco. Their services include Custom Software Development and Web Development.

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  • Click Media Lab Logotype

    Not yet reviewed

    $1,000+
    $25 - $49 / hr
    50 - 249
    Markham, Canada

    Services provided

    10% Web Development
    10% Content Marketing
    10% Content Writing Services +7
    10% Custom Software Development
    10% Digital Strategy
    10% Email Marketing
    10% Mobile App Development
    10% Pay Per Click
    10% Search Engine Optimization
    10% Social Media Marketing

    Focus Areas

    10% JavaScript
    5% AJAX
    5% Apex +16
    5% C++
    5% Delphi
    5% Ember.js
    5% HTML5
    5% Java
    5% Kotlin
    5% Objective C
    5% Other programming & scripting languages
    5% PHP
    5% Perl
    5% Python
    5% Redux
    5% Rust
    5% SQL
    5% Swift
    5% jquery

    Click Media Lab is a Digital Strategy company headquartered in Markham, Canada and Toronto, Canada. They provide Digital Strategy and Social Media Marketing.

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  • Digital Caterpillars Logotype

    Digital Caterpillars

    5.0 2 reviews
    Undisclosed
    $25 - $49 / hr
    10 - 49

    Services provided

    10% Web Development
    15% Logo
    10% Content Marketing +8
    10% Graphic Design
    10% Low/No Code Development
    10% Search Engine Optimization
    10% Social Media Marketing
    10% Web Design
    5% Branding
    5% Product Design
    5% UX/UI Design

    Focus Areas

    10% JavaScript
    20% SQL
    15% PHP +6
    15% Visual Basic
    10% C++
    10% Java
    10% Ruby
    5% ASP.NET
    5% Objective C

    Digital Caterpillars offers comprehensive Website Development services, focusing on creating customized, user-friendly websites with easy navigation. Reviews highlight their professionalism, transparent project management, and effective communication, with clients like Matt Ward Homes expressing high satisfaction with the tailored outcomes and ongoing website maintenance provided.

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  • TopOfStack Software Ltd. Logotype

    TopOfStack Software Ltd.

    Not yet reviewed

    $1,000+
    $25 - $49 / hr
    10 - 49

    Services provided

    20% Web Development
    70% Mobile App Development
    5% Graphic Design +2
    3% UX/UI Design
    2% Web Design

    Focus Areas

    15% JavaScript
    20% Java
    20% Objective C +6
    20% PHP
    5% AJAX
    5% C
    5% C#
    5% SQL
    5% Swift

    TopOfStack Software Ltd. Is a small Dhaka, Bangladesh-based mobile app development company. The team offers Mobile App Development and Web Development.

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  • Spring Computing Technologies Logotype

    Not yet reviewed

    $10,000+
    < $25 / hr
    250 - 999
    Pune, India

    Services provided

    10% Web Development
    30% Custom Software Development
    15% Application Testing +5
    10% E-Commerce Development
    10% IoT Development
    10% Mobile App Development
    10% UX/UI Design
    5% Wearable App Development

    Focus Areas

    25% JavaScript
    10% ASP.NET
    10% C +8
    10% C#
    10% Java
    10% Typescript
    5% Kotlin
    5% Objective C
    5% PHP
    5% Python
    5% Swift

    Located in Pune, India and Frisco, Texas, Spring Computing Technologies is a custom software development company. Their services include Custom Software Development and Application Testing.

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  • IT SUPPORT AU Managed IT Services Logotype

    IT SUPPORT AU Managed IT Services

    5.0 1 review
    Undisclosed
    Undisclosed
    2 - 9

    Services provided

    10% Web Development
    10% Business Consulting
    10% Cloud Consulting & SI +8
    10% IT Managed Services
    10% IT Strategy Consulting
    10% Pay Per Click
    10% Search Engine Optimization
    10% Social Media Marketing
    10% Web Design
    5% Content Marketing
    5% Video Marketing

    Focus Areas

    50% JavaScript
    50% PHP

    IT SUPPORT AU Managed IT Services offers comprehensive managed IT solutions, including cybersecurity, Microsoft 365, infrastructure management, desktop support, data backup, and high service availability. The reviews reflect a positive overall experience, highlighting the company's reliability and proactive support, though some clients suggest improvements in communication and information sharing.

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  • Dudes Team Logotype

    Dudes Team

    5.0 1 review
    $5,000+
    $25 - $49 / hr
    2 - 9

    Services provided

    35% Web Development
    35% UX/UI Design
    20% Search Engine Optimization +1
    10% Pay Per Click

    Focus Areas

    30% JavaScript
    30% PHP
    20% HTML5 +2
    10% AJAX
    10% jquery

    Dudes passion is to: discover – dive into business and the market to uncover the true value design – find the idea to design and grow develop – digital platforms creation (websites,

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  • Request Logotype

    5.0 1 review
    $5,000+
    $100 - $149 / hr
    2 - 9
    Rīga, Latvia

    Services provided

    15% Web Development
    15% Content Marketing
    15% Social Media Marketing +5
    15% Web Design
    10% AR/VR Development
    10% Branding
    10% Ecommerce Marketing
    10% Low/No Code Development

    Focus Areas

    56% JavaScript
    11% C#
    11% Other programming & scripting languages +2
    11% PHP
    11% XML

    Request offers comprehensive Website Development services, including Web Design, Web Programming, and the creation of a launch strategy. Overall feedback highlights their detail-oriented approach, timely project management, and effective communication, resulting in successful project outcomes and high client satisfaction.

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  • amSoft Logotype

    Not yet reviewed

    Undisclosed
    $25 - $49 / hr
    2 - 9
    Opole, Poland

    Services provided

    25% Web Development
    30% Custom Software Development
    25% E-Commerce Development +2
    10% UX/UI Design
    10% Web Design

    Focus Areas

    30% JavaScript
    40% C#
    20% SQL +1
    10% ASP.NET

    Launched in 2017, amSoft is a custom software development company. The team specializes in Custom Software Development and E-Commerce Development.

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  • Star minimedia Logotype

    Not yet reviewed

    $1,000+
    < $25 / hr
    2 - 9
    Lahore, Pakistan

    Services provided

    40% Web Development
    30% E-Commerce Development
    10% Custom Software Development +4
    5% Graphic Design
    5% IT Managed Services
    5% Logo
    5% Mobile App Development

    Focus Areas

    15% JavaScript
    30% PHP
    20% Java +4
    20% Kotlin
    5% AJAX
    5% Python
    5% SQL

    Star minimedia is a website development firm. Headquartered in Lahore, Pakistan, the agency was established in 2020. Their services include Web Development and E-Commerce Development.

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  • Atlantis Software Logotype

    Not yet reviewed

    $10,000+
    $25 - $49 / hr
    2 - 9
    Beograd, Serbia

    Services provided

    30% Web Development
    20% Custom Software Development
    15% AR/VR Development +7
    10% E-Commerce Development
    10% Mobile App Development
    7% Other Application Development
    5% Enterprise App Modernization
    1% AI Development
    1% IoT Development
    1% Wearable App Development

    Focus Areas

    31% JavaScript
    41% SQL
    10% C# +5
    5% Python
    5% Visual Basic
    3% AJAX
    3% C++
    2% Typescript

    Established in 2017, Atlantis Software, a small website development company, is based in Beograd, Serbia. Their team offers Web Development and Custom Software Development.

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  • WSI Digital Marketing Logotype

    Not yet reviewed

    Undisclosed
    Undisclosed
    2 - 9
    Pointe-Claire, Canada

    Services provided

    35% Web Development
    40% Search Engine Optimization
    10% Pay Per Click +2
    10% Social Media Marketing
    5% Graphic Design

    Focus Areas

    33% JavaScript
    34% HTML5
    33% PHP

    Headquartered in Pointe-Claire, Canada, WSI Digital Marketing is a SEO company. They focus on Search Engine Optimization and Web Development.

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  • p.Xel Digital Agency Logotype

    p.Xel Digital Agency

    Not yet reviewed

    $1,000+
    $50 - $99 / hr
    2 - 9

    Services provided

    40% Web Development
    40% E-Commerce Development
    10% Digital Strategy +1
    10% IT Strategy Consulting

    Focus Areas

    34% JavaScript
    33% PHP
    33% SQL

    P.Xel Digital Agency, a small e-commerce development firm, is located in Barcelona, Spain. Their services include E-Commerce Development and Web Development.

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  • eCreative Logotype

    Not yet reviewed

    $5,000+
    $25 - $49 / hr
    2 - 9
    Gdańsk, Poland

    Services provided

    70% Web Development
    20% Mobile App Development
    10% Web Design

    Focus Areas

    24% JavaScript
    60% PHP
    10% SQL +2
    5% AJAX
    1% Ember.js

    Headquartered in Gdańsk, Poland, eCreative is a web development company. They specialize in Web Development and Mobile App Development.

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  • Artik Infotech Logotype

    Not yet reviewed

    $1,000+
    $25 - $49 / hr
    10 - 49
    Surat, India

    Services provided

    30% Web Development
    20% Web Design
    15% Custom Software Development +3
    15% Search Engine Optimization
    10% E-Commerce Development
    10% Mobile App Development

    Focus Areas

    20% JavaScript
    20% HTML5
    20% PHP +3
    20% jquery
    15% SQL
    5% Typescript

    Artik Infotech is a website development firm. Launched in 2019, the firm is in Surat, India. Their team focuses on Web Development and Web Design.

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  • Code Fibers Logotype

    Not yet reviewed

    $1,000+
    $25 - $49 / hr
    2 - 9
    Warszawa, Poland

    Services provided

    20% Web Development
    25% Custom Software Development
    20% BI & Big Data Consulting & SI +2
    20% IT Strategy Consulting
    15% Mobile App Development

    Focus Areas

    25% JavaScript
    50% Go
    10% PHP +2
    10% SQL
    5% AJAX

    Code Fibers is a custom software development company. Their team is based in Warszawa, Poland. The agency specializes in Custom Software Development and BI & big data consulting & SI.

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  • 7S Technology Logotype

    7S Technology

    5.0 1 review
    $10,000+
    $25 - $49 / hr
    50 - 249

    Services provided

    20% Web Development
    20% Blockchain
    20% ERP Consulting and SI +3
    20% Mobile App Development
    10% Custom Software Development
    10% Low/No Code Development

    Focus Areas

    10% JavaScript
    30% Java
    30% Other programming & scripting languages +3
    10% Python
    10% Swift
    10% Typescript

    7S Technology specializes in Website Development and Web Design, as evidenced by their successful completion of a comprehensive platform for eCarAid JSC. Reviewers consistently highlight their exceptional skills, rapid and detailed responsiveness, premium code quality, and ability to deliver projects within budget.

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  • Code Enterprises Logotype

    Code Enterprises

    Not yet reviewed

    $75,000+
    $25 - $49 / hr
    10 - 49

    Services provided

    20% Web Development
    20% E-Commerce Development
    20% Mobile App Development +2
    20% UX/UI Design
    20% Web Design

    Focus Areas

    30% JavaScript
    40% PHP
    20% Python +1
    10% SQL

    Located in Islamabad, Pakistan, Code Enterprises is a web design agency. They provide Web Design and UX/UI Design and were founded in 2011.

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  • PatroNet Consulting Logotype

    Not yet reviewed

    Undisclosed
    $50 - $99 / hr
    2 - 9
    Csömör, Hungary

    Services provided

    40% Web Development
    40% Custom Software Development
    5% E-Commerce Development +3
    5% Search Engine Optimization
    5% UX/UI Design
    5% Web Design

    Focus Areas

    15% JavaScript
    40% PHP
    25% SQL +2
    10% AJAX
    10% HTML5

    PatroNet Consulting is a software development firm. They are located in Csömör, Hungary and have small team of experts. Their services include Custom Software Development and Web Development.

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We evaluate service providers using a structured methodology that combines:

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This data powers tools like the Leaders Matrix, which helps you compare agencies directly. Our research team curates rankings by weighing verified reviews most heavily, so the most trusted and experienced providers rise to the top.

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Ability to deliver
Focus
Clutch Leaders Matrix

Rollover to see company insights or click a company below for more details.

1 Brainhub
2 ImageX
3 xfive
4 The Software House
5 ATEAM SOFT SOLUTIONS
6 Airdev
7 Xmartlabs
8 Toptal
9 Softonix
10 INOXOFT
11 Lizard Global
12 PopArt Studio
13 GeekyAnts
14 SpdLoad
15 Techuz InfoWeb Pvt. Ltd.

List of the Top 15 JavaScript Development Companies

  1. Brainhub Logotype

    Brainhub

    $50,000+
    $50 - $99 / hr
    50 - 249
    Gliwice, Poland

    Ability to deliver

    39.9/40.0
    20/20 Reviews
    10/10 Clients & Experience
    9.9/10 Market Presence

    Service focus

    50% Web Development
    70% JavaScript
    50% Other
    View Profile Visit Website
  2. ImageX Logotype

    ImageX

    $75,000+
    $100 - $149 / hr
    50 - 249
    Vancouver, Canada

    Ability to deliver

    39.7/40.0
    20/20 Reviews
    10/10 Clients & Experience
    9.7/10 Market Presence

    Service focus

    90% Web Development
    50% JavaScript
    10% Other
    View Profile Visit Website
  3. xfive Logotype

    xfive

    $25,000+
    $50 - $99 / hr
    50 - 249
    Kraków, Poland

    Ability to deliver

    39.5/40.0
    19.6/20 Reviews
    10/10 Clients & Experience
    9.9/10 Market Presence

    Service focus

    70% Web Development
    50% JavaScript
    30% Other
    View Profile Visit Website
  4. The Software House Logotype

    The Software House

    $10,000+
    $50 - $99 / hr
    50 - 249
    Gliwice, Poland

    Ability to deliver

    39.4/40.0
    19.6/20 Reviews
    10/10 Clients & Experience
    9.8/10 Market Presence

    Service focus

    45% Web Development
    60% JavaScript
    55% Other
    View Profile Visit Website
  5. ATEAM SOFT SOLUTIONS Logotype

    ATEAM SOFT SOLUTIONS

    $10,000+
    < $25 / hr
    250 - 999
    Thiruvananthapuram, India

    Ability to deliver

    37.7/40.0
    18.4/20 Reviews
    10/10 Clients & Experience
    9.3/10 Market Presence

    Service focus

    50% Web Development
    50% JavaScript
    50% Other
    View Profile Visit Website
  6. Airdev Logotype

    Airdev

    $10,000+
    Undisclosed
    50 - 249
    San Francisco, CA

    Ability to deliver

    38.9/40.0
    19.6/20 Reviews
    9.6/10 Clients & Experience
    9.7/10 Market Presence

    Service focus

    40% Web Development
    50% JavaScript
    60% Other
    View Profile Visit Website
  7. Xmartlabs Logotype

    Xmartlabs

    $10,000+
    $50 - $99 / hr
    50 - 249
    Montevideo, Uruguay

    Ability to deliver

    39.3/40.0
    19.8/20 Reviews
    10/10 Clients & Experience
    9.5/10 Market Presence

    Service focus

    50% Web Development
    35% JavaScript
    50% Other
    View Profile Visit Website
  8. Toptal Logotype

    Toptal

    $50,000+
    $100 - $149 / hr
    1,000 - 9,999
    San Francisco, CA

    Ability to deliver

    39.9/40.0
    20/20 Reviews
    9.9/10 Clients & Experience
    10/10 Market Presence

    Service focus

    15% Web Development
    25% JavaScript
    85% Other
    View Profile Visit Website
  9. Softonix Logotype

    Softonix

    $5,000+
    $25 - $49 / hr
    50 - 249
    L'viv, Ukraine

    Ability to deliver

    36.9/40.0
    18/20 Reviews
    10/10 Clients & Experience
    8.9/10 Market Presence

    Service focus

    70% Web Development
    50% JavaScript
    30% Other
    View Profile Visit Website
  10. INOXOFT Logotype

    INOXOFT

    $25,000+
    $25 - $49 / hr
    50 - 249
    Newark, DE

    Ability to deliver

    40/40.0
    20/20 Reviews
    10/10 Clients & Experience
    10/10 Market Presence

    Service focus

    40% Web Development
    35% JavaScript
    60% Other
    View Profile Visit Website
  11. Lizard Global Logotype

    Lizard Global

    $10,000+
    $50 - $99 / hr
    50 - 249
    Kuala Lumpur, Malaysia

    Ability to deliver

    39.3/40.0
    20/20 Reviews
    10/10 Clients & Experience
    9.3/10 Market Presence

    Service focus

    30% Web Development
    70% JavaScript
    70% Other
    View Profile Visit Website
  12. PopArt Studio Logotype

    PopArt Studio

    $5,000+
    $50 - $99 / hr
    50 - 249
    Chicago, IL

    Ability to deliver

    39.7/40.0
    20/20 Reviews
    10/10 Clients & Experience
    9.7/10 Market Presence

    Service focus

    35% Web Development
    40% JavaScript
    65% Other
    View Profile Visit Website
  13. GeekyAnts Logotype

    GeekyAnts

    $10,000+
    $25 - $49 / hr
    250 - 999
    San Francisco, CA

    Ability to deliver

    39.9/40.0
    20/20 Reviews
    10/10 Clients & Experience
    9.9/10 Market Presence

    Service focus

    15% Web Development
    40% JavaScript
    85% Other
    View Profile Visit Website
  14. SpdLoad Logotype

    SpdLoad

    $50,000+
    $25 - $49 / hr
    50 - 249
    Kharkiv, Ukraine

    Ability to deliver

    36.8/40.0
    17/20 Reviews
    10/10 Clients & Experience
    9.8/10 Market Presence

    Service focus

    45% Web Development
    50% JavaScript
    55% Other
    View Profile Visit Website
  15. Techuz InfoWeb Pvt. Ltd. Logotype

    Techuz InfoWeb Pvt. Ltd.

    $5,000+
    < $25 / hr
    50 - 249
    Ahmedabad, India

    Ability to deliver

    36.8/40.0
    17.2/20 Reviews
    10/10 Clients & Experience
    9.6/10 Market Presence

    Service focus

    60% Web Development
    45% JavaScript
    40% Other
    View Profile Visit Website
  16. HTMLPanda Logotype

    HTMLPanda

    $1,000+
    < $25 / hr
    250 - 999
    Walpole, MA

    Ability to deliver

    35.9/40.0
    16.2/20 Reviews
    10/10 Clients & Experience
    9.7/10 Market Presence

    Service focus

    40% Web Development
    35% JavaScript
    60% Other
    View Profile Visit Website
  17. Sigma Software Group Logotype

    Sigma Software Group

    $50,000+
    $50 - $99 / hr
    1,000 - 9,999
    L'viv, Ukraine

    Ability to deliver

    38.8/40.0
    19/20 Reviews
    10/10 Clients & Experience
    9.8/10 Market Presence

    Service focus

    21% Web Development
    18% JavaScript
    79% Other
    View Profile Visit Website
  18. Incora Logotype

    Incora

    $25,000+
    $25 - $49 / hr
    50 - 249
    L'viv, Ukraine

    Ability to deliver

    37.2/40.0
    18.2/20 Reviews
    10/10 Clients & Experience
    9/10 Market Presence

    Service focus

    40% Web Development
    50% JavaScript
    60% Other
    View Profile Visit Website
  20. Cleveroad Logotype

    Cleveroad

    $10,000+
    $25 - $49 / hr
    250 - 999
    New York, NY

    Ability to deliver

    40/40.0
    20/20 Reviews
    10/10 Clients & Experience
    10/10 Market Presence

    Service focus

    30% Web Development
    15% JavaScript
    70% Other
    View Profile Visit Website
  21. Brainium Information Technologies Logotype

    Brainium Information Technologies

    $10,000+
    < $25 / hr
    250 - 999
    Kolkata, India

    Ability to deliver

    36.3/40.0
    19/20 Reviews
    9/10 Clients & Experience
    8.4/10 Market Presence

    Service focus

    35% Web Development
    30% JavaScript
    65% Other
    View Profile Visit Website
  22. WPWeb Infotech Logotype

    WPWeb Infotech

    $5,000+
    < $25 / hr
    50 - 249
    Ahmedabad, India

    Ability to deliver

    39.7/40.0
    20/20 Reviews
    10/10 Clients & Experience
    9.7/10 Market Presence

    Service focus

    65% Web Development
    20% JavaScript
    35% Other
    View Profile Visit Website
  23. Experion Technologies Logotype

    Experion Technologies

    $10,000+
    $25 - $49 / hr
    1,000 - 9,999
    Plano, TX

    Ability to deliver

    36.9/40.0
    17.2/20 Reviews
    10/10 Clients & Experience
    9.7/10 Market Presence

    Service focus

    20% Web Development
    25% JavaScript
    80% Other
    View Profile Visit Website
  24. Human Made Logotype

    Human Made

    $50,000+
    $150 - $199 / hr
    50 - 249
    Matlock, England

    Ability to deliver

    38.2/40.0
    18.4/20 Reviews
    10/10 Clients & Experience
    9.8/10 Market Presence

    Service focus

    100% Web Development
    30% JavaScript
    View Profile Visit Website
  25. Probey Services Logotype

    Probey Services

    $1,000+
    < $25 / hr
    1,000 - 9,999
    Los Angeles, CA

    Ability to deliver

    36.9/40.0
    19.6/20 Reviews
    9.3/10 Clients & Experience
    8/10 Market Presence

    Service focus

    20% Web Development
    25% JavaScript
    80% Other
    View Profile Visit Website
  26. Blazity Logotype

    Blazity

    $10,000+
    $50 - $99 / hr
    10 - 49
    Warszawa, Poland

    Ability to deliver

    37.8/40.0
    18.6/20 Reviews
    10/10 Clients & Experience
    9.2/10 Market Presence

    Service focus

    50% Web Development
    70% JavaScript
    50% Other
    View Profile Visit Website
  27. XWP Logotype

    XWP

    $50,000+
    $150 - $199 / hr
    50 - 249
    New York, NY

    Ability to deliver

    35.9/40.0
    16.2/20 Reviews
    10/10 Clients & Experience
    9.7/10 Market Presence

    Service focus

    60% Web Development
    45% JavaScript
    40% Other
    View Profile Visit Website
  28. Vincit Logotype

    Vincit

    $50,000+
    $150 - $199 / hr
    250 - 999
    Irvine, CA

    Ability to deliver

    36.4/40.0
    16.4/20 Reviews
    10/10 Clients & Experience
    10/10 Market Presence

    Service focus

    30% Web Development
    30% JavaScript
    70% Other
    View Profile Visit Website
  29. PowerGate Software Logotype

    PowerGate Software

    $10,000+
    < $25 / hr
    250 - 999
    Hanoi, Vietnam

    Ability to deliver

    37.9/40.0
    18.6/20 Reviews
    10/10 Clients & Experience
    9.3/10 Market Presence

    Service focus

    30% Web Development
    21% JavaScript
    70% Other
    View Profile Visit Website
  30. Arcanys Logotype

    Arcanys

    $100,000+
    $25 - $49 / hr
    250 - 999
    Cebu City, Philippines

    Ability to deliver

    38.1/40.0
    19.4/20 Reviews
    10/10 Clients & Experience
    8.7/10 Market Presence

    Service focus

    30% Web Development
    20% JavaScript
    70% Other
    View Profile Visit Website

Top JavaScript Development Agencies

A JavaScript development company designs, builds, and maintains software products that rely on JavaScript across the stack. Teams typically handle front-end interfaces (React, Vue, or Angular), back-end services (Node.js, Express, NestJS), and database integrations. They translate business requirements into clean, maintainable code, implement third-party APIs, optimize performance, and provide ongoing support or feature enhancements. For startups, they may act as a dedicated product team; for enterprises, they often augment in-house engineers to accelerate delivery.

Most agencies bundle multiple offerings so clients can access full product life-cycle support:

  • Discovery workshops & technical consulting
  • UI/UX design and prototyping
  • Front-end SPA or PWA development
  • Server-side development with Node.js or Deno
  • API design, GraphQL, and microservices architecture
  • QA automation & performance testing
  • DevOps, CI/CD, and cloud deployment (AWS, Azure, GCP)
  • Post-launch maintenance and feature sprints

Some firms specialize in niches such as ecommerce storefronts, real-time dashboards, or IoT applications built with JavaScript frameworks like Next.js or Svelte.

Clutch data shows project budgets range widely:

  • MVP or small web app - $15,000–$50,000
  • Mid-size product build - $50,000–$200,000
  • Enterprise-grade platform - $200,000–$1M+ | Hourly rates usually fall between $50–$149 depending on agency location, seniority, and specialization. Expect higher rates for U.S.-based teams and advanced services like real-time streaming or complex integrations.

  • Align expertise: Verify experience with your required stack (e.g., React Native, TypeScript, serverless).
  • Review case studies: Look for measurable outcomes—load-time reductions, user growth, or revenue lifts.
  • Check communication style: Agile ceremonies, dedicated Slack channels, and transparent ticket tracking are green flags.
  • Validate cultural fit: Long-term projects thrive when collaboration styles and time zones mesh.
  • Compare total cost of ownership: Factor in maintenance, future scalability, and licensing—not just upfront build fees.

Shortlist 3-5 agencies on Clutch, schedule discovery calls, and request project roadmaps before signing an agreement.

  • Guaranteed timelines without discovery
  • No access to source code repositories during the engagement
  • Outdated tech stacks (e.g., jQuery-only solutions for modern SPAs)
  • Low developer retention or high turnover
  • Vague pricing models or hidden fees

If an agency dismisses code reviews, ignores testing, or refuses to provide client references, proceed with caution

  • Which JavaScript frameworks do you specialize in, and why?
  • Can you walk me through a recent project with similar complexity?
  • How do you ensure code quality—linting, peer reviews, automated tests?
  • What is your approach to scalability and performance optimization?
  • How will we communicate and track progress (tools, meeting cadence)?
  • Who owns the intellectual property and source code upon project completion?

Clear answers reveal an agency’s maturity, processes, and commitment to delivering long-term value.

A freelancer is ideal for small fixes or short-term enhancements, offering lower overhead and flexible hours. Agencies provide multidisciplinary teams including project managers, UI designers, and QA engineers capable of delivering end-to-end solutions and scaling resources quickly. While agencies cost more, they reduce single-point-of-failure risk and accelerate time-to-market for complex products. How do JavaScript firms measure ROI? Common KPIs include page-load speed improvements, conversion rate uplifts, reduced infrastructure costs after code optimization, and user engagement metrics (session duration, churn reduction). Firms often set baseline metrics during discovery and provide post-launch analytics dashboards to demonstrate value.

Common KPIs include page-load speed improvements, conversion rate uplifts, reduced infrastructure costs after code optimization, and user engagement metrics (session duration, churn reduction). Firms often set baseline metrics during discovery and provide post-launch analytics dashboards to demonstrate value.

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