AgileEngine in Spain seeks a Senior Java Developer to design and build secure, scalable server-side solutions, including a client integration system. You will collaborate with Design and Product teams to understand requirements, estimate work, plan sprints, and ensure timely delivery. This role requires 5+ years of SaaS experience, Java and SQL proficiency, microservices knowledge, a DevOps mindset, strong CI/CD practices, observability, and upper‑intermediate English.