Java Backend Developer

Calypso
Municipality of Madrid, Spain
yesterday

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English, Spanish, German
Experience level
Senior

Job location

Municipality of Madrid, Spain

Tech stack

Java
API
Code Review
Databases
Continuous Integration
Relational Databases
Linux
DevOps
Hibernate
Java Persistence API
Linux System Administration
Object-Oriented Software Development
Systems Development Life Cycle
Red Hat Enterprise Linux - RHEL
Calypso Programming Language
Standard Sql
Software Engineering
SQL Databases
Multithreading
Spring-boot
Technical Debt
Backend
Event Driven Architecture
Containerization
REST

Job description

  • 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, and production support.
  • Embrace infrastructure and platform standards (e.g., Linux RHEL 8+, containerization, CI/CD) and help automate build/test/deploy pipelines.
  • Learn and extend Calypso: configuration, workflows, data models, APIs, and custom components to support triparty collateral and repo processes.
  • Contribute to continuous improvement: reduce technical debt, improve system performance, strengthen security, and enhance developer productivity.

Requirements

  • 4+ years of hands-on software engineering experience with a strong focus on multithreaded backend development in Java (Java 8+).
  • Proficiency with Spring Boot, RESTful API design, and building reliable distributed services.
  • Strong database skills: SQL expertise, sound schema design, and experience with Hibernate/JPA.
  • Solid understanding of object-oriented design, event-driven architectures, and messaging patterns.
  • Familiarity with Linux environments (RHEL 8+), and comfort working with modern CI/CD practices and tooling.
  • Understanding of financial markets and post-trade infrastructure; exposure to collateral or repo is a plus.
  • Growth mindset: positive, result-driven, quality-focused, and systematic thinker with a problem-solving attitude.
  • Collaborative communicator, team-oriented, resilient under pressure; ability to work in a cross-functional, multicultural environment.
  • Language skills: English required; German and/or Spanish are a plus.

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