A technology solutions firm in Spain is seeking a Senior Back-End Engineer to help design, build, and scale a core web platform supporting a fast-growing product. In this role, you will influence technical direction and contribute to architectural decisions. Candidates should have over 5 years of back-end development experience and proficiency in Java or similar languages. Excellent communication skills and a collaborative mindset are essential. This position offers a chance to work in a dynamic environment with an interest in AI/data-driven products being a plus.