We're hiring! Visit our Careers page

Creating software solutions
that work

Start your Project

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 products

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

Check out

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

Check out

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

Check out

Featured projects

Here are a few recent works we are proud of. For more check our Portfolio

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

Check out

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

Check out Featured on Techcrunch

Prioritizing privacy & security

We believe in process driven development & privacy of the data
ISO 9001:2013, ISO 27001:2013 USA certification

TRUSTED BY

From the blog

Usually we are writing about what we are interested in doing. Visit our Blog for more

elixir

Elixir - basic api guide

Elixir api guide Elixir represents relatively new programming language for wider audience. His main trait is that adops functional pardigm because it is built on top of Erlang and runs on BEAM(Erlang VM).

20 min read

css

Media Queries

Reading this post, I take 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

3 min read

navigation

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

3 min read

css

Textarea Tag Busted

The textarea is HTML tag mostly used for messages and comments. It is very similar to inputs, but because it provides an option to have more than one line of text, it is not presented as input [type="textarea"].

3 min read

css

Unlocking CSS Box-shadow

The box-shadow property is used to add a shadow effect to an element. This is property is used quite often to give depth to elements on a website, so it is useful to fully understand it.

3 min read

css

CSS Border-image

The CSS border property is pretty familiar. With this property, you can define the color, style and width of an element border. The border-image property, on the other hand, lets you define a gradient or an image for a border.

2 min read