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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Backend Engineer - **Company:** Septeo - **Location:** Barcelona, Spain - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Spring Security, Artificial Intelligence, Amazon Web Services, Cloud Engineering, Code Review, Relational Databases, Cursor (Graphical User Interface Elements), DevOps, Distributed Systems, Monitoring of Systems, Hibernate (Java), Junit, PostgreSQL, Microsoft SQL Server, Performance Tuning, Mockito, Simple Object Access Protocol (SOAP), TypeScript, Test-Driven Development (TDD), ReactJS, Large Language Models, Spring-boot, Backend, Event Driven Architecture, Containerization, AngularJS, Kubernetes, Performance Monitor, Front End Software Development, Api Design, Restful APIs, Domain Driven Design, Spring Batch - **Published:** June 3, 2026 - **Apply:** https://opcionempleo.com/jobad/es9bf05ea7261e000c1aaca1761213be6d ## About the Role * 5+ years of experience building production-grade backend systems. * Deep expertise in Java and Spring Boot. * Strong experience with relational databases and performance tuning. * Proven experience designing RESTful APIs and distributed systems. * Solid understanding of cloud-native architectures and containerized workloads. * Experience working in high-availability, high-throughput environments. * Strong ownership mindset: you care about reliability, performance, and maintainability. * Comfortable participating in architectural discussions and challenging decisions. * Professional Spanish and English level. Nice-to-Have Superpowers * Experience with Kubernetes and advanced CI/CD pipelines. * Test-Driven Development (JUnit, Mockito). * Experience integrating AI-driven workflows or designing systems that enable ML/AI consumption. * Familiarity with frontend frameworks (Angular, React). * Experience with observability platforms and performance monitoring. * Exposure to Domain-Driven Design (DDD) and event-driven architectures. ## Description * Drive Platform Evolution: Contribute to architectural decisions around scalability, multi-tenancy, observability, and distributed communication (REST, queues, gRPC, batch, integrations). * Build AI-Ready Systems: Design services and data models that enable AI-driven workflows, automation, and intelligent decision layers. * Own the Lifecycle: From domain modeling and API design to deployment, monitoring, and production performance optimization. * Collaborate Cross-Functionally: Work closely with product, frontend engineers (Angular/TypeScript), and DevOps to deliver production-ready features continuously. What You'll Do * Design and implement scalable backend services using Java, Spring Boot, Spring Security, Spring Batch, Hibernate. * Architect RESTful APIs and event-driven integrations with partners (REST, SOAP, gRPC, messaging systems). * Optimize relational data models (SQL Server, PostgreSQL) for performance and maintainability. * Deploy and operate services in Dockerized environments on AWS, ensuring resilience and observability (ELK, monitoring tools). * Implement secure, high-performance, multi-tenant solutions. * Participate in code reviews, technical discussions, and architectural design sessions. * Use AI-assisted development tools (Copilot, Cursor, LLM-based workflows) to increase productivity and share best practices with the team. * Take full responsibility for your code: you build it, you manage it. ## Related Videos - [How Unit Testing Saved My Career](https://www.wearedevelopers.com/videos/1642-how-unit-testing-saved-my-career) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) - [Test-Driven Development: It's easier than you think!](https://www.wearedevelopers.com/videos/1598-test-driven-development-it-s-easier-than-you-think) - [From DevOps to Scaled DevOps: How We’re Rebuilding Continuous Delivery as a Platform](https://www.wearedevelopers.com/videos/100018-from-devops-to-scaled-devops-how-we-re-rebuilding-continuous-delivery-as-a-platform) - [Migrating half a million users to a new payment service provider](https://www.wearedevelopers.com/videos/730-migrating-half-a-million-users-to-a-new-payment-service-provider) - [ChatGPT and Java: A Match Made in Heaven or Hell?](https://www.wearedevelopers.com/videos/536-chatgpt-and-java-a-match-made-in-heaven-or-hell) ## Related Articles - [What’s the Difference Between Frontend and Backend Development?](https://www.wearedevelopers.com/magazine/240-what-s-the-difference-between-frontend-and-backend-development) - [20 Essential Tools For Backend Development](https://www.wearedevelopers.com/magazine/218-20-essential-tools-for-backend-development) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [7 Most Popular Web Developer Jobs in Europe](https://www.wearedevelopers.com/magazine/163-7-most-popular-web-developer-jobs-in-europe) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers)