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Java Backend Developer

SIX

Madrid, Community of Madrid, Spain Full-time May 31, 2026
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Vacancy Description

What You Will Do


  • Design, build, and operate backend services in Java for collateral management and repo workflows, evolving into Calypso customizations and integrations.

  • Develop robust, multi-threaded services and APIs using Java 8+ and Spring Boot; expose and consume RESTful interfaces.

  • Implement event-driven integrations (e.g., messaging/streaming) between Calypso and internal/external systems.

  • Model, optimize, and maintain relational data structures; write efficient SQL and work with ORM frameworks (Hibernate/JPA).

  • Contribute to solution design and architecture, ensuring scalability, resiliency, and observability across services.

  • Collaborate closely with business analysts, Calypso specialists, and SRE/DevOps to deliver reliable, compliant, and secure solutions.

  • Participate in the full SDLC: requirements, estimation, implementation, code reviews, testing (unit/integration), deployment,...
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