Kolosek

Quality code which will be presented
through excellent UX

Our competence in custom software development has helped launch
multiple successful startup companies around the world

11 years

30 employes

8+ years longevity
of support

1-2 products/year gets
to Series A funding

Creative software solutions that work

Together we can create a winning product that will transform it's users’ day-to-day live for the good
Or simplify your business processes & reduce expenses

Web Development

Our developers and designers are there to find the best and the most creative solutions for you and help you end up with a reliable product and user experience

Custom Mobile Apps

Mobile apps are timeless. With their number constantly rising, we make sure to deliver an amazing experience combined with high performance across multiple platforms

User Experience

A good user experience should speak to the end user's emotions. Why? Because it's your user's perception of the product that is going to set you apart from all the other apps out there and your competition

Round-the-clock care for your products

We always know what is ongoing and have a good advice

In-house projects

We are continuously creating new solutions that transform the way you work

Ruby.ci

Best CI platform for your Rails application

2-min setup with no extra code, tools & UI built for your Ruby on Rails Application

Most complex code for best user experience Combining Elixir, Ruby and React

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Sniffler

The most attentive code reviewer

When a GitHub pull request is opened or updated Sniffler simply integrates with your workflow

Sniffler scans and reports errors with your code and helps you fix them whenever possible

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GitPuller

Pull request manager

Get the complete transparency in your product development process without risking access to Intelectual Property

GitPuller does not require actual access to the code on Github

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Featured

We have handpicked a few projects to showcase our multifaceted expertise

The Next Closet

Marketplace

The largest marketplace for second hand designer brands in Netherlands

Building and maintaining web and mobile app with millions of visitors per month

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O.school

Educational platform

Judgment-free, science-based sexual wellness platform · Initial product planning and execution · A virtual classroom app, based on live streaming technology and moderated chat · Featured on Techcrunch

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MoviePilot

Your guide to films & cinemas

Alternative of IMDB for Germany speaking market with huge number of visitors

We are sole technology partner using Ruby on Rails and React for several years

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Boardspan

Governance application

One of the leaders in data analytics, board governance and recruiting to help boards do their best work

Being only technology partner for 5+ years and in charge of whole tech stack including API and cross-platform solution

Maintaining good quality with ~95% test coverage
Raised angel and 2 rounds of VC funding

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WRAP

Mobile engagement technology

Tell your story, provide service, or sell products right in the messaging feed. All with no programming, no waiting, and no apps to download

The Wrap was a big startup that raised Series B funding. At the time we were working together, Kolosek team had a chance to partner up with around 100 people from the San Francisco office

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