Senior React Native Developer

We are a team of technology enthusiasts who create cutting-edge mobile applications with global reach. We work on projects that have a real impact on users - from fintech, to e-commerce, to social media applications.

Due to the growth of our team, we are looking for a Senior React Native Developer who will bring not only technical knowledge to the project, but also initiative, good communication and willingness to mentor other team members.

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to treating everyone equally and fairly, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Your tasks

• Creation and development of mobile applications in React Native (iOS + Android)
• Design and implementation of application architecture
• Integration with REST / GraphQL API
• Optimizing the application for performance and UX
• Conducting code review and technical support for the team
• Collaborating with the backend team, UI/UX and Product Owner
  
  

Requirements

• Minimum of 4 years of experience in mobile application development, including 3 years of experience with React Native
• Proficiency in JavaScript / TypeScript
• Familiarity with Redux / Zustand / React Query or other libraries for state management and API communication
• Experience with native modules and bridges (Android/iOS)
• Practical knowledge of CI/CD, testing (e.g. Jest, Detox), debugging and optimization
• Communicative knowledge of English
• Fluent knowledge of Polish language required
• Residence in Poland required
  
  

Nice to have

• Knowledge of native technologies (Java/Kotlin, Swift/Obj-C)
• Experience with publishing applications to Google Play / App Store
• Previous work with tools like Firebase, App Center, Sentry
• Ability to provide technical mentoring and participate in recruitments
  
  

Job no. 251208-0LM4I

Benefits For You

Great Place to Work

Solid financial situation

Contracts with the biggest brands

Centre of internal trainings

Many experts you can learn from

Open and accessible management team

Profit sharing

Passion Sponsorship program

Regular integration events and trips

Comfortable and well-equipped offices

MySii app

Medical care