Senior Fullstack Developer (Java + React)

• 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 both frontend and backend
• JUnit, Mockito, WireMock, JPA/Hibernate, Git
• XML processing (XSLT, XPath, XQuery)
• Kubernetes and Docker
• Microservices and distributed systems
• Daily work with AI coding agents (GitHub Copilot, OpenCode or similar)
• English at B2 level or higher

Nice to have

• Micro-frontend architecture
• Helm, Jenkins CI/CD
• Headless CMS (NEOS CMS is a plus)
• Legacy system migrations and refactoring
• BDD and test automation (e.g. Playwright)

We offer

• B2B contract, 130-160 PLN/h net
• Fully remote work in an international team
• A modern stack and real AI-driven development
• A long-term project with a strong technology roadmap