State-of-the-art
front-end & back-end systems
Why state-of-the-art? Because every app we create is a unique piece of work
which our team, in cooperation with you, has dedicated its time to
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
Quality code which will be presented
through excellent UX
The Kolosek team consists of development and designer teams which make sure that clients get to fully experience our product development process — from coming up with a project idea, to design and front-end development, all the way to back-end development
..and also
- Product research
- UI UX Design
- Test driven development
- DevOps
- Project management
- Marketing & Sales
Our projects
We are continuously creating new solutions that transform the way you work
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
LiteTracker
The most complete Pivotal Tracker successor
Agile project management platform for teams migrating from Pivotal Tracker
Story management, velocity tracking, and real-time collaboration with integrations for GitHub, Slack, and 50+ tools
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
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
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
Check outPrioritizing privacy & security
We believe in process driven development & privacy of the data
ISO 9001:2013, ISO 27001:2013 USA certification
From the blog
Usually we are writing about what we are interested in doing. Visit our Blog for more
State Management in React Apps - Part I
Previously we have learnt how to properly use JSX, and how React components communicate with each other. Yet, we still didn't cover another very important question: where to store information that our application cares about. Today we're talking about application state management in React. There are a lot of ways to handle application state but first, let's take a look at the simplest one - components' state. React Components' State You might have previously seen this.state. A componen
Media Queries
Reading this post, I take it you know things like internet(daaah), browser, responsiveness and good music (I can only hope). With that in mind I will continue the story... Every presentation made for the browser (web presentation) in today's world, can be seen through millions of different devices (if the presentation is lucky) with different dimensions (in any case). So while the Web presentation is in progress, responsiveness is always in mind. About To make the right experience with fu
Problem Solved: Navigation on Scroll
A challenge we recently faced was that we needed to create a navigation that shows only when scrolling up. How did we solve it? Well, firstly, the HTML for the form was created. Keep in mind that while creating the form, Bootstrap was used. Here we have solved the problem using CSS and jQuery. Some of the useful CSS properties that should be learned are relative font size, columns, relative and absolute positioning. Now, let's move on. Then, we created the static navigation and the navig









