Backend Java Developer – Freelance

Senior Backend Java Developer – London

We are looking for a Senior Backend Java Developer to join the transformation of a strategic digital product enabling connectivity with external sales channels such as marketplaces, social commerce and quick‑commerce platforms. The role focuses on contributing to a major architecture rebuild in Java Spring Boot within a cloud‑native environment, with strong scalability, reliability and real‑time stock/price synchronization challenges.

Location: London – 3 days on‑site per week (hybrid). Fluency in English is mandatory; French is a plus. Target start date is June. Local compliance constraints, including UK market regulations and IR35, must also be taken into account.

Key Responsibilities

• Lead the architectural rebuild of the existing product into a modern Java Spring Boot stack.
• Design and optimise technical connectors for external sales channels, including marketplaces, social commerce and quick‑commerce platforms.
• Rebuild and stabilise catalog publication flows, including category mapping, product variant synchronization and asynchronous marketplace APIs.
• Migrate complex business rules related to pricing, stock filtering and fulfilment decisions.
• Ensure highly reliable real‑time synchronization of stock and pricing data.

Core Requirements

• Strong hands‑on experience with Java / Spring Boot.
• Solid experience with PostgreSQL.
• Good knowledge of Redis / Valkey.
• Strong understanding of REST architecture and event‑driven architecture.
• Proven experience with GCP and Kubernetes.
• Ability to work in a complex, international, product‑driven environment.

Nice to Have

• Experience with Python to support the transition of legacy components.

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