Senior React Native Developer

Salary: 21 000 - 35 000 PLN net + VAT (B2B)

Callstack is a cross-platform and AI-native technology company working with some of the world’s leading brands to build better digital products and services.

We’re deeply rooted in the React and React Native ecosystem - as core contributors, Open Source creators, and co-founders of the React Foundation. We work at the edge of what’s possible, collaborating with industry leaders and helping shape the technology we use every day.

We also bring the community together through React Universe Conf, Agent Conf, meetups around the world, and talks at international conferences.

Our main goal is to drive and accelerate software development innovation. When the way software is built changes, we help companies adopt it. To achieve that, we follow our major rule:

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

Come build, experiment, and push the boundaries of cross-platform and AI-native engineering with us!

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!

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

• 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 Wellbeing & Development Budget

• Monthly lunch allowance

• Accounting costs refund

• Flexible working hours and fully remote work possibility

• Cool office in Wrocław city center

• Magnificent team events and activities

• Company-wide workation and team building workshops

• Top-notch hardware - Apple devices