Callstack provides top cross-platform consultancy & development in React.js and React Native. We co-create and shape the technology as core contributors and innovators.

Take a look at our Open Source projects.

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.

Callstack also organizes the only 100% React Native and community- driven conference in Europe - React Native EU.

Our main goal is to drive and accelerate software development innovation. To achieve that, we follow our main rule:

We don’t follow best practices.

We set them!

What is unique about working at Callstack?

• You will work with the best React Native experts on applications used by millions worldwide. Our clients are serious.
• You can develop your own ideas in our R&D program. If you want to bring your visions to life - Callstack will support you.
• You have a possibility to contribute in projects like React Native Paper, Linaria, RN Testing Library etc.
• You can use our dedicated budget to work on Open Source projects.
• There are plenty of possibilities to showcase your expertise: You can speak at our React Native EU conference, be featured in our blog, or The React Native Show podcast episode.
• With our help you can also upgrade your soft skills, managing skills or become a Mentor in the future.

Join us and work with the TOP Silicon Valley and Fortune 500 companies in the USA!

What you will do as a React/React Native expert at Callstack:

• Develop cross-platform software for our clients’ projects.
• Work on applications used by millions of people worldwide.
• Take the opportunity to get involved in our R&D or Open Source activities.
• Arrive at solutions that bring about concrete benefits for the client.
• Share expertise in cross-platform technologies with fellow devs.
• Collaborate with development teams, CTOs, and PMs from all around the world.

You are the right candidate if you are: 

• A JavaScript expert with extensive knowledge and expertise in modern frameworks and libraries.
• Skilled in and enthusiastic about React.js and React Native.
• Experienced in web or mobile apps development (4+ years).
• Driven towards learning new technologies and knowledge-sharing initiatives.
• Able to quickly gain new technical expertise.
• Fluent in English (C1+).
• Passionate about the open source mission (documented contributions to any open source project would be a huge plus).
• A great communicator and team player.
• Proactive and self-driven.
• Fun to work with :)

Why work with us? Because you can:

• Realize your potential in our R&D program.
• Work on software used by millions.
• Take part in our Open Source projects.
• Grow in your unique expert role.
• Code with the top experts and community leaders.
• Showcase your expertise by speaking at our conference, being featured in our blog or podcast episode.
• Co-create and shape core technology.
• Join the React Native community.
• Develop soft skills.

What we offer:

• 24 paid days off & 30 days paid sick leave for B2B contractors
• Fully-covered life insurance
• Private healthcare for you and your family
• Free access to mental health platform - Helping Hand
• Multisport Card or monthly allowance for other sports activities
• Individual self-development budget
• Monthly lunch allowance
• Accounting costs refund for B2B contractors
• Flexible working hours and fully remote work possibility
• Private villa on Mallorca available for every Callstacker to work from
• Cool office in Wrocław city center
• Magnificent team events and activities
• Company-wide workation and team building workshops
• Top-notch hardware - Apple devices
• Free entry and possibility to participate in the biggest RN conference in the whole Europe (React Native EU Conference)