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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Backend Developer (Kotlin/Spring Boot) - **Company:** Jobgether - **Location:** Málaga, Spain (Remote available) - **Contract:** Temporary contract - **Skills:** Artificial Intelligence, Automation of Tests, Data Structures, Identity and Access Management, Interoperability, Java Virtual Machine (JVM), Junit, PostgreSQL, OAuth, Fast Healthcare Interoperability Resources, Spring-boot, Reliability of Systems, Backend, Kotlin, Health Level Seven International, Api Design - **Published:** September 6, 2026 - **Apply:** https://www.buscojobs.com.es/senior-backend-developer-kotlin-spring-boot-en-malaga-ID-370103240 ## About the Role 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 ## Description 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 flexible 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 structuresContribute to the development of a custom FHIR server built in Kotlin and Spring BootCollaborate with a small engineering team to define architecture, split tasks, and align on technical directionDevelop and maintain robust backend services using PostgreSQL, including JSONB-based data modeling and complex queriesBuild and expand comprehensive automated test coverage using JUnit to ensure system reliabilityIntegrate and work with healthcare data standards such as FHIR R4 where applicableParticipate in technical discussions, surfacing blockers and refining system design with the teamSupport secure authentication and authorization patterns using OAuth and identity management systemsEnsure backend systems are scalable, maintainable, and aligned with long-term platform goalsRequirements:Strong experience in backend development using Kotlin and/or JVM-based technologiesSolid hands-on experience with Spring Boot in production environmentsProven ability to build or contribute to high-abstraction systems such as query engines, rule engines, or dynamic processing frameworksStrong knowledge of PostgreSQL, including advanced querying and JSONB data modelingExperience writing and maintaining comprehensive automated test suites using JUnitAbility to work collaboratively within a small engineering team and align on shared architectural decisionsStrong communication skills with fluent English (minimum B2 level) for daily technical collaborationComfortable working remotely within Europe and engaging in distributed team workflowsBonus: familiarity with HL7 FHIR (R4), HAPI FHIR, or healthcare data systemsBonus: experience with OAuth flows, identity providers such as Zitadel, or authorization systems like SpiceDBBenefits:Competitive compensation aligned with senior-level expertiseFully remote work within Europe with flexible collaborationOpportunity to work on a cutting-edge healthcare infrastructure projectExposure to complex, real-world FHIR and healthcare interoperability challengesClose collaboration with experienced engineers in a highly technical environmentStrong influence on architecture and system design decisionsLong-term engineering impact on a critical healthcare data platformInternational, collaborative, and engineering-driven cultureHow Jobgether works:We use anAI-powered matching processto 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?Data Privacy Notice:By submitting your application, you acknowledge that Jobgether will process your personal data to evaluate your candidacy and share relevant information with the hiring employer. This processing is based on legitimate interest and pre-contractual measures under applicable data protection laws (including GDPR). You may exercise your rights (access, rectification, erasure, objection) at any time.#LI-CL1We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us. ## Related Videos - [Kotlin Multiplatform - True power of native code reuse](https://www.wearedevelopers.com/videos/4-kotlin-multiplatform-true-power-of-native-code-reuse) - [How Unit Testing Saved My Career](https://www.wearedevelopers.com/videos/1642-how-unit-testing-saved-my-career) - [Keeping applications secure by evolving OAuth 2.0 and OpenID Connect](https://www.wearedevelopers.com/videos/100152-keeping-applications-secure-by-evolving-oauth-2-0-and-openid-connect) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) - [Why Kotlin is the better Java and how you can start using it](https://www.wearedevelopers.com/videos/661-why-kotlin-is-the-better-java-and-how-you-can-start-using-it) - [Back(end) to the Future: Embracing the continuous Evolution of Infrastructure and Code](https://www.wearedevelopers.com/videos/440-back-end-to-the-future-embracing-the-continuous-evolution-of-infrastructure-and-code) ## Related Articles - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Backend Developer Salary in Germany [2023]](https://www.wearedevelopers.com/magazine/196-backend-developer-salary-in-germany-2023) - [The Biggest German Tech Companies](https://www.wearedevelopers.com/magazine/424-the-biggest-german-tech-companies) - [What’s the Difference Between Frontend and Backend Development?](https://www.wearedevelopers.com/magazine/240-what-s-the-difference-between-frontend-and-backend-development) - [7 Most Popular Web Developer Jobs in Europe](https://www.wearedevelopers.com/magazine/163-7-most-popular-web-developer-jobs-in-europe)