Backend Java Developer – Freelance

Job description

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.

The consultant will join a London-based feature team, with an expected presence of 3 days per week onsite. Fluent English is mandatory; French would be a plus. Target start date is June. Local compliance constraints, including UK market regulations and IR35, must also be taken into account.

Key responsibilities

• Play a leading role in the architectural rebuild of an existing product into a modern Java Spring Boot stack.
• Design and optimize technical connectors for external sales channels including marketplaces, social commerce and quick-commerce platforms.
• Rebuild and stabilize catalog publication flows, including category mapping, product variant synchronization and asynchronous marketplace APIs.
• Contribute to the migration of complex business rules related to pricing, stock filtering and fulfillment decisions.
• Ensure highly reliable real-time synchronization of stock and pricing data.

Requirements

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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