We Build Great Software

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

11 years

30 employes

8+ years longevity
of support

1-2 products/year gets
to Series A funding

Since 2011 we have partnered with more than 30 brands. Mostly from America, Europe & Australia

Meet the team

We are a project development team that consists of bright and witty dog lovers

If Bill Gates was right and technology is just a tool, then we want to use it to create something awesome and help our clients as much as possible. Our biggest advantages are our drive and willingness to learn new things. We have been working in the industry for years and, until this day, we enjoy finding new solutions and technologies that cater to our clients’ demands.

What happens when a new challenge comes up? We face it and overcome it, as a team. Poor leadership is expensive and that's why we make sure there is a proper leadership team development. With transparency, initiative, and proper communication we were able to efficiently complete all of our projects.


Over the years, we have created a number of high-quality apps using Ruby on Rails,
React, Angular, Node, and other technologies

We maintain a high level of engineering culture in the team and constantly integrating latest and most relevant tools to improve workflow

5.0 Clutch rating

70M + records may contain
databases we operate


Kolosek is an open source software company. This means that those services we don’t offer within the company, we develop and share openly. We, too, use open source projects and in most cases, we try to improve their current versions and give back to both contributors and the community.

We also unselfishly help nearby conferentions, ideas and movements as well as students and teaching facilities (e.g. Rails Girls).

Make it happen