Java Full-Stack Developer

SIX is looking for an experienced Software Engineer to help shape and evolve our API Management Platform and developer experience. You will drive roadmap topics, bring your own ideas, and own solutions end-to-end-from design to production operations.

You'll have the space to propose, prototype, and productize platform capabilities that measurably improve adoption and time-to-integrate for consuming teams.

Working across multiple lines of business, you will turn business use cases into simple, secure platform capabilities and drive adoption through standards, automation, and documentation. You will partner with Architects, Engineers, Service Managers, and Security-making pragmatic trade-offs, clarifying ambiguity, and raising the bar for reliability (SLOs, observability, post-incident improvements).

You thrive in an Agile, DevOps-oriented team and enjoy taking responsibility for outcomes-not just delivering tickets.

What You Will Do

• Drive roadmap topics, propose improvements, and own whole epics end-to-end; set patterns and guardrails for the API platform
• Design and build backend services and automation APIs (REST) for self-service platform workflows on OpenShift, balancing simplicity, security, and scalability
• Improve CI/CD, automated tests, and quality gates to shorten lead time and increase confidence in production changes
• Drive API standards and platform guardrails (e.g., OpenAPI, security patterns) with Architecture and Security; enable teams with clear docs and examples
• Own reliability for your components: observability (metrics, logs, tracing), SLOs, runbooks, and post-incident improvements; contribute to security assessments/audits
• Take part in the on-call rotation (L1/L2) and reduce operational load through automation and continuous improvement

• Strong hands-on experience with Java and Spring Boot, building and operating API-based services (REST, microservices) in production
• Engineering judgment and craftsmanship (Clean Code/Clean Architecture), with an ownership mindset and focus on maintainability
• Experience with Docker and Kubernetes/OpenShift, plus infrastructure as code and production operations
• Hands-on CI/CD and build automation (e.g., Maven), including pipelines, test strategies, and deployment automation
• Experience with SQL and NoSQL databases (e.g., PostgreSQL, MongoDB) and performance-aware data access
• Practical experience owning API lifecycle topics (OpenAPI, versioning, backward compatibility, and consumer-facing documentation)
• Good understanding of API security (OAuth2/OIDC, JWT, mTLS, least privilege) and experience with reviews and audits
• Strong lifecycle management in Agile teams; comfortable leading technical discussions and aligning stakeholders

BME - Bolsas y Mercados Españoles - drives the transformation of financial markets and belongs to SIX, the third largest exchange group in Europe. What sets us apart drives us ahead: between local roots and global relevance, we are a unique blend of tradition and future, of foundation and growth. We value bright minds and inspire them to grow with their ideas. Come and shape the future of finance with us.