Senior Fullstack Developer (Java + React)

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📍 100% remote 💰 130–160 PLN/h net (B2B) About the client A leading German telecommunications and IT services company is opening a new Engineering & Technology Center in Poland. You’ll join the platform team behind the online shop of a major telecom provider. About the project The platform consists of around 20 micro-frontends and services that render everything customers see, from tariff tables to product pages. After seven years of development, the platform is entering its next stage: scaling, finishing the migration of legacy shops, paying down technical debt and adopting new API standards. The team is going all-in on AI-driven development, with coding agents, custom skills and spec-driven workflows at the core of everyday engineering. Your responsibilities Develop the online shop platform, built on a micro-frontend architecture Own features end to end, from the React UI to the Java backend behind it Build backend services in Java, Spring Boot and WebFlux Integrate the shop with internal services and with customer and contract data systems Migrate legacy shops and reduce technical debt Use AI coding agents as your primary way of working Must have Several years of commercial experience in web application development, working independently at senior level Java 8+ (familiarity with Java 25), Spring Boot (familiarity with Spring Boot 4) and REST APIs Reactive programming: Spring WebFlux, Project Reactor or a similar stack React, TypeScript, HTML and NPM, and comfort working on

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