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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