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Senior Fullstack Dev Teams | No Vendor Lock-in

For over ten years Selleo has delivered professional services on more than 150+ software development projects for clients from Europe, the US, Canada, and Australia, designing and building a number of applications throughout a wide spectrum of business domains, industries, and technologies (React, Node, React Native, Python, Ruby on Rails, EmberJS, Elixir).

Extend your in-house team

  • Min project size
    $10,000+
  • Hourly rate
    $25 - $49 / hr
  • Employees
    50 - 249
  • Locations
    Bielsko-Biała, Poland
  • Year founded
    Founded 2005
  • Languages
  • Timezones

1 Language that we service

  • English

1 Timezone that we service

CET
Central European Time (CET)

2 Locations

  • Bielsko-Biała , Poland
  • Bielsko-Biała , Poland

No have been added yet...

    Pricing Snapshot

    Min. project size $10,000+
    Avg. hourly rate $25 - $49 /hr
    Rating for cost 4.5 /5

    What Clients Have Said

    Selleo offers competitive pricing with clients noting strong value for cost. Projects ranged from $20,000 to over $600,000, depending on scope and duration. Clients praised their quality and responsiveness, indicating a good return on investment.

    This summary is based on verified Clutch reviews.

    Most Common Project Size

    $50,000 - $199,999 based on 24 reviews
    < $49,999 $50,000 - $199,999 $200,000 - $999,999 > $1,000,000

    Select a service to see pricing information

    Selleo Review Insights

    Overall Review Rating

    4.8
    • Quality 4.6
    • Schedule 4.5
    • Cost 4.5
    • Willing to Refer 4.8

    Top Mentions

    Review Highlights

    • Proactive in Offering Constructive Feedback

      Selleo is proactive in providing constructive feedback and suggestions, which clients find valuable for improving project outcomes and overall development processes.

    • Positive Client Feedback and Successful Outcomes

      Clients report successful project outcomes, such as increased user engagement, streamlined operations, and enhanced product functionality. Selleo's work often leads to positive feedback from end-users and stakeholders.

    • Strong Cultural Fit and Team Collaboration

      Clients often note Selleo's cultural compatibility and seamless integration with in-house teams. Their collaborative approach and dedication to client success are highlighted as key strengths, making them feel like an extension of the client's team.

    • Proficient in Custom Software Development

      Selleo is praised for its ability to develop custom software solutions across various industries including SaaS, fintech, healthcare, and education. Their work spans from MVPs to full-fledged platforms, consistently meeting client specifications and enhancing business operations.

    • High-Quality UX/UI Design

      Selleo is recognized for its high-quality UX/UI design. Clients appreciate the aesthetic and functional design solutions that enhance user experience, with some projects receiving high ratings and positive user feedback.

    • Challenges with Meeting Deadlines and Quality

      While generally praised, some clients have reported issues with Selleo's ability to meet deadlines and maintain quality standards consistently, leading to project delays and subpar deliverables.

    Selleo Reviews

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    UX/UI Design for Support & Enablement Platform

    • Custom Software Development UX/UI Design Web Design
    • $50,000 to $199,999
    • May 2025 - Apr. 2026
    5.0
    Quality
    4.0
    Schedule
    4.0
    Cost
    4.0
    Willing to Refer
    5.0

    "What stood out was how well they translated business needs into a product that feels coherent and polished."

    Apr 24, 2026
    CEO, Smarketing
    Linda Jensen
    Verified
    • Information technology
    • Norway
    • 1-10 Employees
    • Online Review
    • Verified

    Selleo designed and developed an MVP for a sales support and enablement platform. The solution included a content library, a manager dashboard, and in-app notifications.

    Event Mgmt Platform's Web & Mobile App Dev for Software Co

    • Custom Software Development Mobile App Development UX/UI Design
    • Confidential
    • Nov. 2024 - Mar. 2025
    4.5
    Quality
    4.5
    Schedule
    4.0
    Cost
    4.0
    Willing to Refer
    4.5

    "Overall, I highly value them as a long-term partner."

    Feb 19, 2025
    Manager, Articulate Entertainment
    Anonymous
    Verified
    • Arts, entertainment & music
    • Boston, Massachusetts
    • 1-10 Employees
    • Online Review
    • Verified

    Selleo has built a live event management platform for a software company. The team has designed and developed a web app and an iOS app to streamline event scheduling and artist and venue management.

    Custom Software Development for Engineering Company

    • Custom Software Development IT Staff Augmentation Web Development
    • Confidential
    • Jan. 2024 - Ongoing
    5.0
    Quality
    5.0
    Schedule
    4.0
    Cost
    5.0
    Willing to Refer
    5.0

    "They are responsive to our needs, making necessary adjustments promptly to accommodate changing requirements."

    Sep 27, 2024
    Senior Machine Learning Engineer, PhysicsX
    Matthew Brennan
    Verified
    • Other industries
    • City of London, England
    • 51-200 Employees
    • Online Review
    • Verified

    A software engineering company has hired Selleo to implement a web platform. The team has integrated navigation features, secure authorization protocols for user management, and dynamic tables.

    Platform & AI Features Dev for Real Estate FinTech Company

    • AI Development Custom Software Development UX/UI Design
    • $50,000 to $199,999
    • Feb. 2024 - Ongoing
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0
    "Selleo's communication skills, expertise, and excellent language proficiency ensure clear and effective interactions."
    Aug 7, 2024
    Co-Founder, Real Estate FinTech Company
    M K
    Verified
    • Real estate
    • United Arab Emirates
    • 1-10 Employees
    • Online Review
    • Verified

    Selleo has been hired by a real estate fintech company to develop a platform for property-related activities. The team integrates admin-verified listings, oversees agency operations, and implements AI features.

    App Development for Grey Market Detection Platform

    • Application Testing Custom Software Development UX/UI Design
    • Confidential
    • May 2022 - Ongoing
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "The Selleo team is a pleasure to work with."

    Aug 18, 2023
    VP Engineering, GreyScout
    Kenneth Kerrigan
    Verified
    • Other industries
    • Dublin, Ireland
    • 11-50 Employees
    • Online Review
    • Verified

    A grey market detection platform has hired Selleo for application design and development. The team is implementing new features and modern designs; key technologies include React.js and TypeScript.  

    Staff Aug, UI/UX Design & Dev Services for Learning Platform

    • Custom Software Development Graphic Design IT Staff Augmentation UX/UI Design
    • Confidential
    • July 2020 - Ongoing
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    4.0
    Willing to Refer
    5.0

    "The team at Selleo cares about delivering good software, and it shows in all aspects of their work."

    May 25, 2023
    Director of Engineering, Qstream
    Douglas Reynolds
    Verified
    • Other industries
    • Burlington, Massachusetts
    • 51-200 Employees
    • Online Review
    • Verified

    Selleo provides staff augmentation services for a learning platform. Selleo's team supports the client with UI/UX accessibility improvements and custom development using React.js and RESTful API.

    Learning Platform Dev for Educational Services Provider

    • Application Testing Custom Software Development UX/UI Design Web Design Web Development
    • Confidential
    • June 2020 - Ongoing
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "The team is extremely engaged and delivers a full picture of the project status, and this builds extraordinary trust."

    Apr 14, 2023
    CTO, Educational Services Provider
    Rob Eifler
    Verified
    • Education
    • Chicago, Illinois
    • 11-50 Employees
    • Online Review
    • Verified

    Selleo designed and developed a career learning platform for an educational services provider. The team integrated the new platform with the legacy platform.

    Development for Solution Provider Company

    • Web Development
    • $10,000 to $49,999
    • Oct. 2019 - Ongoing
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "Their technical skills and knowledge of new technologies are impressive."

    Apr 13, 2021
    CEO, Kubed AS
    Genevieve Hart
    Verified
    • Other industries
    • Oslo, Norway
    • 1-10 Employees
    • Online Review
    • Verified

    Selleo updates a software solution provider's web application. The team also created additional features to improve the client's management process. 

    UI/UX Design & Audit for Digital Ads Distributor

    • UX/UI Design
    • $10,000 to $49,999
    • May 2020 - Ongoing
    4.5
    Quality
    4.5
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    4.5

    "I highly recommend them as a trustworthy software development partner."

    Sep 8, 2020
    CTO, Guidle AG
    Drazen Nikolic
    Verified
    • Advertising & marketing
    • Baar, Switzerland
    • 11-50 Employees
    • Online Review
    • Verified

    A digital ads distributor hired Selleo to assist in UI/UX design, auditing, and project implementation.

    Showing 1-10 of 37 Reviews

    Our Story

    We are Selleo - a community of self-driven digital experts crafting secure, scalable software across SaaS, EdTech, HRM, fintech, healthcare and e‑commerce. Our team blends Ruby on Rails, React/React Native, Node, Python and mobile expertise with Management 3.0 principles: ownership, proactiveness, respect and teamwork.

    Since our Rails origins we’ve grown into a 100+ strong, community‑engaged firm with ISO certifications and award‑winning culture, delivering dozens of successful projects.

    Clutch verification provides an additional layer of data to help you make the right purchasing decision of business services.

    Learn More
    Verified Client Reviews
    36
    Overall Review Rating
    4.8
    Source
    Clutch
    Last Updated
    April 24, 2026

    Business Entity

    Business Entity Name Selleo Labs Sp. z o.o.
    Source Central Statistical Office of Poland
    Jurisdiction of Formation Poland
    Date of Formation October 13, 2021
    Status Active
    Last Updated July 8, 2025
    ID 0000925982

    Credit Report Results

    International Credit Risk Assessment Low Risk
    Source Creditsafe
    Last Updated July 8, 2025
    Learn More About The Clutch Verification Process

    Locations (2)

    Powstańców Śląskich 3 Bielsko-BiałaPoland 43-300

    50 - 75

    Contact Selleo

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    Smarketing AS

    (1)
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    Linda Jensen

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