• Get Matched

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.
  • Investments of $800,000.00+ several times
  • Featured on Techcrunch several times
  • https://link.kolosek.com/27c67570 - Raised $800K
  • Bronze Verified
  • $10,000+
  • $50 - $99 / hr
  • 10 - 49
  • Novi Sad, Serbia
  • Founded 2011

1 Language that we service

  • English

4 Timezones that we service

EST
Eastern Standard Time (EST)
PST
Pacific Standard Time (PST)
CET
Central European Time (CET)
ACT
Australia Central Time (ACT)

1 Locations

  • Novi Sad , Serbia
Total Reviews
4
Average Referral Rating
3.9 /5
Most Common Project Size

Focus

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    Kolosek Review Insights

    Overall Review Rating

    3.9
    • Quality 3.9
    • Schedule 3.8
    • Cost 3.8
    • Willing to Refer 3.9

    Top Mentions

    • communicative (1)
    • easy to work with (1)
    • flexible (1)
    • high-quality work (1)
    • proactive (1)
    • timely (1)
    • understands the needs of their clients (1)

    Review Highlights

    • Seamless Workflow and Project Management

      Kolosek's use of tools like Pivotal Tracker ensures seamless workflow and effective project management, allowing clients to track progress and communicate easily.

    • Room for Faster Development

      One client mentioned the desire for faster development speeds, although they understood it depended on various factors and overall were pleased with the relationship.

    • Excellent Web and Mobile App Development

      An HR startup praised Kolosek for developing web, iOS, and Android apps that exceeded expectations. The team is noted for their competence, flexibility, and seamless workflow.

    • Impressive Communication Skills

      Multiple clients appreciated Kolosek's quick and effective communication. The ease of interaction and quick response times were highlighted as key strengths.

    • Effective Bug Fixing and Code Quality

      Kolosek successfully addressed code quality issues for an online luxury fashion marketplace. Their detailed-oriented approach and timely delivery ensured minimal disruption to ongoing business operations.

    • High Level of Support

      Clients noted the CEO's quick response to inquiries and high level of involvement in project success. This personal investment was seen as a major positive aspect.

    All Filters
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    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."

    Feb 12, 2020
    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
    • $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."

    Feb 8, 2019
    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."

    Jan 30, 2019
    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 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."

    Nov 4, 2023
    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.

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

    Learn More
    Verified Client Reviews
    4
    Overall Review Rating
    3.9
    Source
    Clutch
    Last Updated
    November 4, 2023
    Business Entity
    Business Entity Name Kolosek IT Doo Novi Sad
    Source Agency for Economic Registers
    Jurisdiction of Formation Serbia
    Date of Formation April 21, 2016
    Status Active
    Last Updated September 28, 2024
    ID 21189936
    Payment & Legal Filings
    International Credit Risk Assessment Low Risk
    Source Creditsafe
    Last Updated September 28, 2024

    Locations (1)

    16 - 20

    Contact Kolosek

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