Senior Backend Developer – Kotlin, Spring Boot

Jobtailor; Deutschland; Vor Ort; EUR 70.000 - 90.000; Vollzeit

Zusammenfassung

Jobtailor is seeking a backend engineer to help build a custom FHIR server and a dynamic query engine. You will work closely with a small team to translate requirements into scalable components.

The role emphasizes high-level abstraction, Kotlin/JVM development, and robust PostgreSQL usage (JSONB). Remote work in Europe is welcome, with Portugal preferred for time zones and collaboration.

Qualifikationen

• Extensive backend experience with high abstraction levels.
• Experience with dynamic parameters and FHIR structures.
• Proficient in Kotlin and JVM backend development.
• Spring Boot experience strongly preferred.
• Strong PostgreSQL skills incl. JSONB and complex queries.
• Ability to write and maintain a comprehensive JUnit test suite.
• Excellent communication and cross-team collaboration.
• English at least B2 for daily collaboration.
• Based in Europe (Portugal preferred), remote work.

Aufgaben

• Help build a custom FHIR server from the ground up.
• Implement a dynamic query engine with flexible params.
• Collaborate with a team of 3 developers on design decisions.
• Join to implement remaining components, focusing on the query engine.

Kenntnisse

Abstract backend design

Dynamic query engine

Kotlin

Spring Boot

PostgreSQL JSONB

JUnit testing

Team collaboration

English B2

Tools

Spring Boot

PostgreSQL

JUnit

Jobbeschreibung

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