Backend AI Developer (Java/Quarkus) - Hybrid Leça da Palmeira (2 days/week office)

Backend AI Developer (Java/Quarkus) - Hybrid Leça da Palmeira (2 days/week office) ABOUT THE OPPORTUNITY Our client, a technology-driven company shaping the future of mobility across the Iberian market, is looking for a Mid-level Backend Developer to join their engineering team. This is a chance to work at the intersection of backend engineering and applied AI, using tools like GitLab Duo and Claude Code as part of your everyday workflow to build reliable, high-quality software faster. PROJECT & CONTEXT You will design, build, and maintain backend services and APIs using Java and Quarkus, while embracing an AI-first approach to how the team codes, tests, and reviews software. Day-to-day work includes solving backend tasks such as features, bug fixes, refactors, and integrations, writing automated unit and integration tests, participating in AI-assisted and peer code reviews, and troubleshooting CI/CD pipelines with the help of GitLab Duo. You'll collaborate closely with backend engineers, QA, and product to deliver dependable, well-tested software in a fast-moving, AI-enabled environment. WHAT WE'RE LOOKING FOR (Required) 4+ years of hands-on backend development experience Experience with Java (Quarkus is a plus) Practical experience using AI-assisted development tools such as GitHub Copilot, GitLab Duo, Claude Code, or similar as part of a daily engineering workflow Experience designing and building APIs and Java-based microservices that run reliably at scale in production Experience writing automated unit and integration tests for backend systems Ability to understand the functional and business context of a feature before designing the technical solution Curiosity and willingness to experiment with new AI tools and integrate them responsibly into day-to-day development practices Comfortable working in a fast-moving environment where AI-assisted development practices are still evolving Strong attention to detail, critical thinking, and problem-solving skills B1 English (Intermediate) minimum, with good verbal and written communication skills Collaborative, adaptable, and able to manage multiple priorities effectively NICE TO HAVE (Preferred) Experience with LLM-based integrations, Retrieval-Augmented Generation (RAG), or agent orchestration workflows Familiarity with MCP (Model Context Protocol) or similar tool/context integrations that connect AI assistants to internal systems Exposure to AI-native development practices beyond code completion, such as spec-driven development frameworks, custom prompt or skill libraries, and automation workflows