Overview

About Kolosek

Kolosek is a development and design consultancy that brings your digital product ideas to life. We've produced top quality applications for clients across the United States and the rest of the world. Business raises Series A, Series B when they start working with us. Building products that achieve goals.

What clients say

Review Analytics of Kolosek

Every review is verified through Goodfirms before it's published.

5.02 Verified Reviews
Quality5.0
Schedule & Timing5.0
Communication5.0
Overall5.0
Review Summary
Summarized from 2 verified reviews · Updated August 2026
Clients report satisfaction with Kolosek's development services, particularly for cross-platform projects spanning iOS, Android, and web applications. The company's work on complex applications like HR social networking platforms has led to strong client retention, with at least one client indicating they do not plan to seek alternative vendors. The reviews suggest competence in handling multi-platform development requirements.
✦ AI-generated summary. May not reflect every review.
Detailed Reviews of Kolosek
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What reviewers mention most

Jens Nikolaj Aertebjerg
Jens Nikolaj Aertebjerg, Founder at AppPraiseVerified Review
Posted on Feb 8, 2019

iOS & Android & Web App for HR Social Networking

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
App Designing (UI/UX)Mobile App DevelopmentSoftware Development

We choose Kolosek to assist us with creating our App for Human Resource Social Network and a few other things. Upon conducting an extensive search for possible development partners throughout multiple countries, we selected Kolosek to provide us with: - Platform strategy - Architecture - Development specifications - Systems setup - UI/UX Design - Front & Back-end Development - Testing Through out the project we have been extremely satisfied and Kolosek have surpassed our expectations many times and on many areas. Especially their flexibility, their ability to value add, their engagement in our project as if it was their own baby, their many suggestions for improvements and enhancements, and their rock steady hand and management of the project even in the hard times you always experience at times when the code is challenging you or limitations impose themselves on your scope and requirements. They have been amazing and their CEO is a constant source of comfort and trust. I have worked with external development houses in India, Poland, Scandinavia, US, Pakistan, Ukraine, Germany and a few other places, and I would choose Kolosek over again anytime. Our product which is in a soft launch phase with test clients, have become the great App it is, not least because of all the wonderful people at Kolosek. It's been an inspiring and learning process.

Igor Dobrosavljevi
Igor Dobrosavljevi, Founder/CEO at Grand ConsultingVerified Review
Posted on Feb 6, 2019

Won't be looking for another development shop.

Overall rating5.0
Quality5.0
Communication5.0
Schedule & Timing5.0
Web Development

After a couple of years of trying to find a good fit for our development needs and dealing with people that just didn't understand what deadlines are we finally found our home with Kolosek and won't be looking back. After two years of working together with these guys I can say that it'll be hard to top the level of service that they deliver.

Focus

Service Focus of Kolosek

How the team's effort is distributed across services.

50%30%10%

Industries Focus

40%20%20%10%10%

Client Focus

Small Business100%
Selected Work

Client Portfolio of Kolosek

Where their work concentrates - by industry, budget, and timeline.

Project Industry

Startups50%
Gaming25%
Education25%
Major industry focus
Startups

Project Cost

$10001 to $5000075%
$0 to $1000025%
Common project cost
$10001 to $50000

Project Timeline

1 to 25 Weeks50%
26 to 50 Weeks50%
Typical timeline
1 to 25 Weeks

Portfolios: 4

Where we are

Locations (1)

Offices where Kolosek operates.

Headquarter
Serbia

Serbia

Bulevar Oslobodjenja
Novi Sad, Vojvodina 21000