Callstack. Company profile.

UI engineer passionate about building mobile and web experiences, high quality JS tooling and Open Source. Core Jest & React Native Community contributor. Space exploration enthusiast.

Jakub Kłobus

Engineering Manager

Software developer working at Callstack since the very beginning. After mastering web, he moved to React Native where he focuses on making Reason React Native next big thing. A fan of leadership as partnership.

Łukasz Chludziński

React Native Expert

RN developer with mobile background, highly skilled in performance optimization. Mentor in the field of Community and Trainings at Callstack. Podcast host at The React Native Show Podcast and DevSpresso: JS News.

Tech stack

React Native

React

Node.js

JavaScript

TypeScript

Next.js

Take a closer look

How it all started?

The company was founded in 2016 by Mike Grabowski and Anna Lankauf. We grew very fast during the last few years, and now we are a team of over 100 highly skilled individuals that can help you with your React and React Native project.

What is unique about Callstack?

At Callstack You can develop your ideas in our R&D program. If you want to bring your visions to life in Open Source - Callstack will support you. Also we provide self- development budget. With our help you can upgrade your soft and managing skills to become a Mentor in the future.

Blog & Podcasts

Also, there are plenty of possibilities to show your expertise: become a speaker on a conference, be featured in our blog, or podcast!

Open Source Leadres

During our journey we became the main contributors in Open Source, launching libraries like React Native Paper, Linaria, RN Testing Library etc.

React Universe Conf

Since 2017, Callstack has organized the biggest React Native-related conference on our planet! Formerly known as React Native EU, it has evolved into React Universe Conf, for better alignment with our current focus on all things React and React Native. It is a unique place for developers to share their expertise and learn from the top industry talents. By joining us, you can become the co-creator of next year’s event and a part of this amazing community.