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SII POLAND

SII UKRAINE

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Senior React Native Developer (f/m/x)

  • Senior
  • Hybrid, 
  • Office
  • Warsaw
This offer base language is English. Translate into Swedish.
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Technologies & tools

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.

Your tasks

  • 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

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

Nice to have

  • 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)

Job no. 260617-EMF4J

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

Teknologier & verktyg

Bli en del av en av Europas största mobilplattformar, som levererar digitala tjänster som används av miljontals användare i flera länder i Europa och Nordamerika. Plattformen bygger på en arkitektur med flera moduler och möjliggör snabb produktutveckling, hög återanvändbarhet av kod samt kontinuerlig expansion till nya affärsområden.

Som Senior React Native-utvecklare kommer du att spela en nyckelroll i utformningen av arkitekturen för ett stort mobilt ekosystem, driva tekniska beslut, handleda andra ingenjörer och leverera högkvalitativa lösningar i stor skala.

Dina uppgifter

  • Utforma, utveckla och underhålla komplexa mobilapplikationer med hjälp av React Native och TypeScript
  • Driva arkitektoniska beslut och bidra till utvecklingen av vår plattform med flera moduler
  • Leda tekniska diskussioner och delta i utformningen av lösningar
  • Granska kod, handleda teammedlemmar och främja bästa praxis inom teknik
  • Arbeta i nära samarbete med produktägare, UX-designers, backend-ingenjörer, QA-ingenjörer och arkitekter
  • Förbättra applikationernas prestanda, tillförlitlighet, skalbarhet och underhållsbarhet
  • Bidra till CI/CD-processer och utvecklingsverktyg
  • Stödja integrationen av inbyggda mobilfunktioner och tjänster från tredje part
  • Identifiera teknisk skuld och driva proaktivt på förbättringar i hela kodbasen

Krav

  • Minst 5 års erfarenhet av kommersiell mjukvaruutveckling, varav minst 4 år med React Native
  • Dokumenterad erfarenhet av att bygga och underhålla storskaliga mobilapplikationer
  • Djupgående expertis inom TypeScript, modernt JavaScript och React Hooks
  • Grundlig förståelse för modulär och multimodulär applikationsarkitektur
  • Praktisk erfarenhet av MobX och React Query (TanStack Query)
  • Kunskap om koncept inom native mobilutveckling och skapande av native-moduler för iOS och Android
  • Praktisk erfarenhet av REST-API:er, GraphQL och lösningar för formulärhantering
  • Kunskaper i engelska och polska på nivå B2 eller högre
  • Bosatt i Polen krävs

Bra att ha

  • Betalningsintegrationer och lösningar för mobila plånböcker
  • Geolokalisering och platsbaserade tjänster
  • Firebase-tjänster och analysverktyg
  • Bästa praxis för mobil säkerhet
  • Verktyg för observabilitet och övervakning
  • Erfarenhet av storskaliga internationella produkter
  • Erfarenhet av agil leverans (Scrum/Kanban)

Jobb nr 260617-EMF4J

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

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Senior React Native Developer (f/m/x)

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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
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