Senior Backend Developer – Kotlin, Spring Boot

Responsibilities

• Help build a custom FHIR server from the ground up
• Implement a dynamic query engine that operates on flexible parameters and FHIR structure definitions at runtime
• Work closely with a team of 3 internal developers, aligning on design decisions, task division, and progress
• Join to implement the remaining components, with a focus on the query engine

Requirements

• Demonstrable experience building abstract backend implementations — query engines, rule engines, dynamic data processing systems, or comparable high‑abstraction work
• Strong ability to work at a high level of abstraction — the query engine operates on dynamic parameters and FHIR structure definitions, not a fixed set of operations
• Solid experience with Kotlin and/or JVM‑based backend development; Spring Boot experience strongly preferred
• Experience with PostgreSQL, including JSONB storage patterns and complex relational query design
• Ability to implement and maintain a comprehensive JUnit test suite alongside production code
• Strong communication and collaboration skills — you'll be working closely with the internal team on a shared task breakdown, not independently
• Comfortable aligning on design decisions, surfacing blockers, and adapting approach based on team feedback
• English B2 or above — required for daily collaboration with an international team
• Based in Europe (Portugal preferred), available to work fully remote