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Callstack provides top cross-platform consultancy & development in React Native and React.js. We co-create and shape the technology as core contributors and innovators. Our main goal is to drive and accelerate software development innovation.

Software HouseInformation Technology100 - 200Wrocław

tech stack

React Native logo

React Native

React logo


Node.js logo


JavaScript logo


TypeScript logo




our team

Michał Pierzchała

Head of Technology

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

Technical Development Lead

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.

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?

1. You will work with the best RN Experts on apps used by millions. Our clients are serious.
2. 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.
3. With our help you can upgrade your soft and managing skills to become a Mentor in the future.
4. You have plenty of possibilities to show your expertise: become a speaker on a conference, be featured in our blog, or podcast.

Our proud partnerships

During our journey we became the main contributors in Open Source, launching libraries like React Native Paper, Linaria, RN Testing Library etc. We are official Meta partners. In 2022 we started cooperating with Vercel in official partnership.

React Native EU conference

We hold events such as conferences, meetups or hackathons. We are proud organizers of the biggest react native conference in the world (and the first conference in Europe) which focuses exclusively on React Native. It’s a unique place for sharing expertise and learning from the top industry leaders.
Since 2017 we bring the React Native community together to discuss technical topics and network with fellow developers.

our office


    Prosta 36

company insight

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job offers

SAFe Scrum Master
SAFe Scrum Master
18 000 - 24 000 PLN
18k - 24k PLN
, Fully RemoteFully Remote
Scrum MasterCommunication SkillsAgile
Senior React Native Developer
Senior React Native Developer
22 000 - 33 000 PLN
1d ago
22k - 33k PLN
, Fully RemoteFully Remote
Lean Six Sigma Lead
Lean Six Sigma Lead
4d ago
Warszawa, +1 location, Fully RemoteFully Remote
EnglishMS Excel
Lean Six Sigma Lead
Lean Six Sigma Lead
4d ago
Wrocław, Fully RemoteFully Remote
EnglishMS Excel