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Offer summary
(Summary generated by AI based on the full job description)
The project involves one of Europe's largest mobile platforms serving millions across Europe and North America, built on a multi-module architecture. Key technologies include React Native, TypeScript, MobX, React Query, with integrations using REST APIs and GraphQL. Responsibilities include designing and developing mobile apps, driving architectural decisions, mentoring, code reviews, team collaboration, performance optimization, and supporting CI/CD processes.
from: 17 June 2026
to: 17 July 2026
salary not specifiedB2B contract
Offer parameters
level:senior
working mode:hybrid • full office
Warszawa, Mokotów
Requirements
Expected technologies
React Native
TypeScript
MobX
React Hooks
React Query/ TanStack Query
React Native Reanimated
Axios REST APIs
Apollo Client GraphQL
GitHub Actions
Shopify FlashList
Our requirements
- At least 5 years of commercial software development experience, including at least 4 years with React Native
- Proven track record of building and maintaining large-scale mobile applications
- Strong expertise in TypeScript, modern JavaScript, and React Hooks
- Solid understanding of modular and multi-module application architecture
- Hands-on experience with MobX and React Query (TanStack Query)
- Knowledge of native mobile development concepts and creating native modules for iOS and Android
- Practical experience with REST APIs, GraphQL, and form management solutions
- English and Polish proficiency at B2 level or higher
- Residing in Poland required
Optional
- Payment integrations and mobile wallet solutions
- Geolocation and location-based services
- Firebase services and analytics
- Mobile security best practices
- Observability and monitoring tools
- Background in large-scale international products
- Agile delivery experience (Scrum/Kanban)
Your responsibilities
- Design, develop, and maintain complex mobile applications using React Native and TypeScript
- Drive architectural decisions and contribute to the evolution of our multi-module platform
- Lead technical discussions and participate in solution design
- Review code, mentor team members, and promote engineering best practices
- Collaborate closely with Product Owners, UX Designers, Backend Engineers, QA Engineers, and Architects
- Improve application performance, reliability, scalability, and maintainability
- Contribute to CI/CD processes and development tooling
- Support the integration of native mobile capabilities and third-party services
- Identify technical debt and proactively drive improvements across the codebase
About the project
Join one of Europe's largest mobile platforms, delivering digital services used by millions of users across multiple countries in Europe and North America. Built on a multi-module architecture, the platform enables rapid product development, high code reusability, and continuous expansion into new business areas.
As a Senior React Native Developer, you will play a key role in shaping the architecture of a big mobile ecosystem, driving technical decisions, mentoring other engineers, and delivering high-quality solutions at scale.
What we offer
- Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
- Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
- We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
- Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
- Comfortable workplace – class A offices or remote work
- Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
- PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
- Investment in your growth – meetups, webinars, training platform and technology blog – you choose
- Fantastic atmosphere created by all Sii Power People
Recruitment stages
- 1.Send your CV
- 2.Talk to us about your expectations
- 3.Learn more about our projects and choose the best
- 4.Start your adventure with Sii!
Sii Sp. z o.o.
Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.
Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.
This is how we work
Senior React Native Developer (f/m/x)
I apply to:
Sii Sp. z o.o.
Warszawa, Mokotów
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