Our partner is looking for a Senior Backend Developer (Java/Spring Boot, Agentic LLMs) based in Spain. As a Senior Backend Developer, you will contribute to building and enhancing a high-performance technology platform serving the general business aviation industry. You will develop robust backend services and scalable applications using Java and Spring Boot, working across distributed systems, APIs, and event-driven architectures. This hands-on engineering role combines established software development practices with practical applications of large language models (LLMs) and agentic AI workflows. Collaborating closely with product and engineering teams, you will take ownership of features from implementation through testing and delivery. In a remote-first, international environment, you will have the opportunity to influence technical quality, improve system reliability, and apply emerging AI technologies to real-world engineering challenges. Accountabilities:
- Backend development: Design, develop, maintain, and optimize backend services using Java and Spring Boot, delivering reliable, scalable, and maintainable software.
- Take ownership of software features throughout their lifecycle, from understanding requirements and implementation to testing, debugging, deployment, and ongoing improvement.
- Build and maintain REST APIs that support web applications, mobile experiences, and integrations with external systems.




- Implement asynchronous processing and event-driven workflows using Apache Kafka or comparable messaging and streaming technologies.
- Database management: Design and maintain relational data models using PostgreSQL and Hibernate, with a focus on data integrity, query efficiency, and application performance.
- Apply practical knowledge of large language models, retrieval-augmented generation (RAG), agent-tool interactions, and LLM orchestration to develop intelligent backend capabilities and automation workflows.
- Use tools such as Cursor, Claude Code, and GitHub Copilot to accelerate development while maintaining high standards for code quality, testing, security, and maintainability.
- Engineering quality: Write clean, well-tested code, apply sound functional programming principles, and contribute to debugging, code reviews, and continuous improvement.
- Identify opportunities to improve system performance, reliability, maintainability, and development efficiency through modern engineering practices. At least six years of hands-on Java backend development experience, ideally using Java 17 or a comparable modern version.
- Backend frameworks: Strong experience with Spring Boot 2. x and Hibernate 5. Database expertise: Solid knowledge of PostgreSQL, relational database modeling, and data persistence using Hibernate or related technologies.

📌 Senior Backend Developer (España)
🏢 Jobgether
📍 España