Senior React Native Developer

Salary: 21 000 - 35 000 PLN net + VAT (B2B) or 18 000 - 29 000 PLN gross (UoP)

Callstack was founded in 2016 by Mike Grabowski and Anna Lankauf . Our company provides top cross-platform consultancy &development in React.js and React Native. We co-create the technology and collaborate with the Meta team on shaping the technology as core contributors and innovators.

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

We don’t follow best practices. We set them!

Callstack also organizes React Universe Conf - the only community- driven and fully dedicated to React ecosystem conference in Europe.

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

As a Senior React Native Developer, you will:

Act as a technology consultant for our clients and help them build great products for multiple platforms

Drive the development process by providing expertise in cross-platform technologies and solving the most complex programming issues

Use AI-assisted development tools as a standard part of your engineering workflow to improve productivity, code quality, debugging, and technical decision-making

Collaborate with development teams, CTOs, Project Managers, and Product Owners from all around the world

Have multiple possibilities to contribute to the Open Source community by working on projects led by our CTO, React Native Core Contributors, and our Senior Developers

Be one step ahead, exploring technologies of tomorrow, and being a part of our R&D activities

Simply have fun!

Requirements

You are the right candidate if you have:

A JavaScript expertise with extensive knowledge of modern frameworks and libraries

Experience in React.js and React Native

Strong commercial experience in mobile app development (above 3 years), experience in web development is a plus

AI-native mindset and practical familiarity with modern AI coding tools such as Codex, Claude Code, or Cursor, with the ability to use them effectively in daily software development work

Strong drive towards learning new technologies and knowledge-sharing initiatives

Ability to quickly gain new technical expertise

Fluency in English (min. B2+)

Passion about the open source mission (documented contributions to any open source project would be a huge plus)

Great communication skills and being a team player

Proactive and self-driven approach to work

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