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.

• 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.

• 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.

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