Senior React Native Developer (f/m/x)

Sii • Polish: C1 • JavaScript • TypeScript • 1 month ago
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Salary
$64k – $77k per year
Location
Remote (Poland)
Seniority
Senior · 5+ years exp
Employment
Full-Time
Overview
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Sii

Sii is a Polish company in the information technology and engineering services sector. It provides software development, testing, business process outsourcing, and engineering solutions for clients in industries such as finance, telecommunications, automotive, and manufacturing.
sii.pl • HQ: Warsaw, Poland • IT Outsourcing • Software • Information Technology

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 the B2 level or higher

  • Residing in Poland required

Nice-to-have requirements

  • 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)

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

  • 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

If you want to work on systems with high operational significance - apply now!

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