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 versátil 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 data infrastructure.
Accountabilities:
Design and implement high-abstraction backend components, with a focus on a dynamic query engine for FHIR-based data structures
Contribute to the development of a custom FHIR server built in Kotlin and Spring Boot
Collaborate with a small engineering team to define architecture, split tasks, and align on technical direction
Develop and maintain robust backend services using PostgreSQL, including JSONB-based data modeling and complex queries
Build and expand comprehensive automated test coverage using JUnit to ensure system reliability
Integrate and work with healthcare data standards such as FHIR R4 where applicable
Participate in technical discussions, surfacing blockers and refining system design with the team




Support secure authentication and authorization patterns using OAuth and identity management systems
Ensure backend systems are scalable, maintainable, and aligned with long-term platform goals
Requirements:
Strong experience in backend development using Kotlin and/or JVM-based technologies
Solid hands-on experience with Spring Boot in production environments
Proven ability to build or contribute to high-abstraction systems such as query engines, rule engines, or dynamic processing frameworks
Strong knowledge of PostgreSQL, including advanced querying and JSONB data modeling
Experience writing and maintaining comprehensive automated test suites using JUnit
Ability to work collaboratively within a small engineering team and align on shared architectural decisions
Strong communication skills with fluent English (minimum B2 level) for daily technical collaboration
Comfortable working remotely within Europe and engaging in distributed team workflows
Bonus: familiarity with HL7 FHIR (R4), HAPI FHIR, or healthcare data systems
Bonus: experience with OAuth flows, identity providers such as Zitadel, or authorization systems like SpiceDB
Benefits:
Competitive compensation aligned with senior-level expertise
Fully remote work within Europe with flexible collaboration
Opportunity to work on a cutting-edge healthcare infrastructure project
Exposure to complex,



real-world FHIR and healthcare interoperability challenges
Close collaboration with experienced engineers in a highly technical environment
Strong influence on architecture and system design decisions
Long-term engineering impact on a critical healthcare data platform
International, collaborative, and engineering-driven culture
How Jobgether works:
We use an
AI-powered matching process
to ensure your application is reviewed quickly, objectively, and fairly against the role's core requirements. Our system identifies the top-fitting candidates, and this shortlist is then shared directly with the hiring company. The final decision and next steps (interviews, assessments) are managed by their internal team.
We appreciate your interest and wish you the best
Why Apply Through Jobgether?
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📌 Senior Backend Developer (Málaga)
🏢 Jobgether
📍 Málaga