This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Backend Developer (Kotlin/Spring Boot) based in Spain.

This role is part of a highly technical healthtech initiative focused on rebuilding a core FHIR server from the ground up. You will be working on complex, abstraction-heavy backend engineering challenges, going far beyond standard API development. The primary focus is the design and implementation of a dynamic query engine capable of interpreting adaptable parameters and FHIR structure definitions at runtime. You will join an existing team of engineers and contribute to a shared architecture, working collaboratively on design decisions and system evolution. The environment is deeply technical, with strong emphasis on scalability, correctness, and healthcare interoperability standards. This is a hands-on role where your work will directly influence the backbone of modern healthcare dat...