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Competitive advantage for startups

We've worked with dozens of clients over the years, form one person startups to large brands and we know secret sauce to success. A small organized team, perfect for nurturing your business needs.

Here are is the proof:

  • Series A round of funding.
  • Series B round of funding.
  • Featured on Techcrunch several times
  • Raised $800K, mutltiple times
  • Min project size
    $10,000+
  • Hourly rate
    $50 - $99 / hr
  • Employees
    10 - 49
  • Locations
    Novi Sad, Serbia
  • Year founded
    Founded 2011

1 Locations

  • Novi Sad , Serbia
No have been added yet...

    Pricing Snapshot

    Min. project size $10,000+
    Avg. hourly rate $50 - $99 /hr
    Rating for cost 4.3 /5

    What Clients Have Said

    Kolosek's pricing is generally seen as competitive, with projects ranging from $20,000 to $30,000. Clients appreciate the good value for cost, particularly for mobile app and web development services, though experiences vary significantly, with some reporting issues with project delivery.

    This summary is based on verified Clutch reviews.

    Most Common Project Size

    $50,000 - $199,999 based on 8 reviews
    < $10,000 $10,000 - $49,999 $50,000 - $199,999 > $200,000
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    Highly Rated Similar Providers

    Kolosek Review Insights

    Overall Review Rating

    4.3
    • Quality 4.3
    • Schedule 4.4
    • Cost 4.3
    • Willing to Refer 4.4

    Top Mentions

    Review Highlights

    • Proficient in Ruby on Rails

      Kolosek is highly skilled in using the Ruby on Rails framework, delivering robust backend solutions and seamless integration with third-party systems. Multiple clients praised their expertise in this area, making them a reliable choice for projects requiring this technology.

    • Flexible and Adaptable Team

      Kolosek's team is recognized for their flexibility and ability to integrate with client teams. They adjust strategies as needed and provide proactive solutions, which is highly valued by clients across various industries.

    • Positive Client Relationships

      Many clients highlight Kolosek's strong cultural fit and alignment with company values, fostering positive and productive relationships. This aspect is often a deciding factor for clients choosing Kolosek over competitors.

    • Mixed Feedback on Code Quality

      While most reviews praise Kolosek's technical work, one client reported subpar code quality and communication issues, leading to a negative experience. This suggests a potential inconsistency in project execution.

    • Effective Project Management

      Clients appreciate Kolosek's project management, noting timely deliveries and effective communication through platforms like Google Meet, Slack, and Trello. Their ability to adapt and meet client needs efficiently is a recurring positive theme.

    • Responsive and Supportive Leadership

      Kolosek's leadership, particularly the CEO, is lauded for quick responsiveness and high-level support, ensuring client success and satisfaction. This leadership approach contributes significantly to the company's positive reputation.

    Kolosek Reviews

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    Mobile App Backend Dev for IT Solutions Outsourcing Company

    • Mobile App Development
    • $10,000 to $49,999
    • Mar. 2020 - Ongoing
    4.5
    Quality
    4.5
    Schedule
    5.0
    Cost
    4.5
    Willing to Refer
    5.0

    “They’ve done a good job, and we’re pretty happy with them.”

    CEO, IT Solutions & Web Dev Outsourcing Company
    Anonymous
    • Software
    • Subotica, Serbia
    • 11-50 Employees
    • Phone Interview 
    • Verified

    Kolosek has built the backend of an iOS mobile app for an IT solutions outsourcing company's end client. The team has set up a Heroku server, built a Ruby on Rails API, and connected it with third parties.

    Web Design for UX Design Agency

    • Mobile App Development UX/UI Design Web Design Web Development
    • $10,000 to $49,999
    • Aug. - Nov. 2024
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "The project management by Kolosek was highly effective."

    CEO, Star Sudio
    Dejan Baric
    • Design
    • Novi Sad, Serbia
    • 1-10 Employees
    • Online Review 
    • Verified

    A UX design agency hired Kolosek to redesign their website. The team also created landing pages and digital campaigns for the client. The goal was to increase the client's web traffic.

    Backend Development for Retail Company

    • Custom Software Development
    • Less than $10,000
    • Dec. 2019 - Jan. 2020
    5.0
    Quality
    5.0
    Schedule
    4.5
    Cost
    4.5
    Willing to Refer
    5.0

    "The ease within which we were able to communicate was impressive."

    CEO, Stylemyle
    Mazen Kurdy
    • Retail
    • Singapore
    • 1-10 Employees
    • Online Review 
    • Verified

    Kolosek was hired to fix bugs in the client's backend. They utilized Ruby on Rails and Spree Commerce to redevelop their e-commerce platform. 

    Mobile & Web App Dev for HR Startup

    • Mobile App Development Web Development
    • $50,000 to $199,999
    • Apr. 2016 - Ongoing
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "I'm impressed by their level of competence and flexibility."

    CEO & Founder, AppPraise
    Jens Nikolaj Aertebjerg
    • Business services
    • Copenhagen, Denmark
    • 1-10 Employees
    • Online Review 
    • Verified

    Kolosek developed web, iOS, and Android apps. They handled architecture, UI/UX design, development, and testing needs. Their services are ongoing.

    Custom Web App Dev for IT Service Provider

    • Custom Software Development
    • $10,000 to $49,999
    • June 2017 - Ongoing
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "Kolosek has met every expectation so far. We’re extremely happy with our collaboration."

    Founder & CEO, Grand Consulting
    Igor Dobrosavljević
    • Business services
    • Des Moines, Iowa
    • 1-10 Employees
    • Online Review 
    • Verified

    Kolosek built a custom web application in Ruby on Rails to capture billable calls for an IT service provider. The solution records the data in custom Linux-run servers. The team now provides support services. 

    Web Design & Development for Architectural Company

    • Web Design Web Development
    • $50,000 to $199,999
    • Jan. 2023 - Oct. 2024
    4.5
    Quality
    4.5
    Schedule
    5.0
    Cost
    4.5
    Willing to Refer
    4.5

    “The best thing about Kolosek is that they put themselves in our shoes.”

    CEO, Architectural Company
    Anonymous
    • Other Industry
    • Zagreb, Croatia
    • 1-10 Employees
    • Phone Interview 

    Kolosek designed and built a web platform for an architectural company. The team used Ruby on Rails for the backend and React for the frontend to create three modules to digitalize the client’s work processes.

    Custom Software Development for Architecture Company

    • Custom Software Development
    • Confidential
    • Jan. 2023 - Oct. 2024
    4.5
    Quality
    4.5
    Schedule
    4.5
    Cost
    5.0
    Willing to Refer
    4.5

    "Their openness and customer support were amazing."

    CEO, Architecture Company
    Filip Zrnčić
    • Construction
    • Zagreb, Croatia
    • 1-10 Employees
    • Online Review 

    Kolosek developed a custom software solution for an architecture company. The software created specifications, integrated bills of quantities, created a tender system, and exported data in PDF and XLS files.

    Staff Aug, API & Mobile App Development for Software Dev Co

    • API Development Mobile App Development Staffing
    • $50,000 to $199,999
    • Apr. 2020 - Apr. 2021
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "They were a proactive part of the team."

    CEO, LambdaWorks
    Bojan Babic
    • Software
    • Novi Sad, Serbia
    • 11-50 Employees
    • Online Review 
    • Verified

    A software development company hired Kolosek to provide development staff augmentation services. The team developed an MVP of a mobile app, its backend, and an API to support it.

    Web Dev for Real Estate Company

    • Web Development
    • $50,000 to $199,999
    • Jan. 2019 - Dec. 2020
    0.5
    Quality
    0.5
    Schedule
    0.5
    Cost
    0.5
    Willing to Refer
    0.5

    "They did not deliver items on time and often did not deliver items at all."

    Business Owner, Real Estate Company
    Anonymous
    • Real estate
    • Austin, Texas
    • 51-200 Employees
    • Online Review 
    • Verified

    A real estate company hired Kolosek to overhaul their brokerage management platform. Kolosek was tasked with adding features to the client's platform, including the optical character recognition functionality.

    Locations (1)

    16 - 20

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