Java Backend Developer (m/f/d)

WHAT YOU CAN EXPECT Design, develop, and maintain robust, scalable backend services that support and enhance our internal and external applications. Work in an agile, self-organized team and collaborate effectively with colleagues. Develop new backend functionality using Java and Spring Boot, following modern backend engineering principles and best practices. Maintain and improve existing backend services, ensuring performance, reliability, and long-term maintainability. Design, implement, and evolve RESTful APIs and service interfaces to enable seamless integration with frontend applications and other systems. Write clean, maintainable, and efficient code in line with team coding standards and industry best practices. Contribute actively to planning, refinement, reviews, operations, and continuous improvement activities within the team. Collaborate closely with frontend developers to ensure smooth data flows, clear API contracts, and consistent end-to-end behavior. Implement and maintain unit, integration, and component tests to ensure high quality, stability, and regression prevention. Share responsibility for operations and maintenance as part of the team’s DevOps mindset, including monitoring, troubleshooting, and continuous optimization. (Nice to have) Show interest in frontend technologies such as Angular and full-stack development, with opportunities to collaborate across the stack if desired. WHAT WE NEED FROM YOU Bachelor’s Degree in Computer Science, Software Engineering, or similar in the same level or higher. Around 3-5 years of professional experience with Java (= 21) and building backend applications in production environments Strong hands-on experience with Spring Boot (3.x) and core Spring modules such as Spring Data, Spring Integration, Spring Batch, and Spring Security Solid understanding of persistence technologies, including JPA 2 / Hibernate, and designing robust data access layers. Experience designing, implementing, and maintaining RESTful APIs for microservice-based systems. Good knowledge of SQL databases, ideally PostgreSQL, including data modeling and query optimization. Experience writing unit and integration tests (e.g., JUnit or similar frameworks) to ensure code quality and stability. Familiarity with microservice and cloud architectures, including service communication and API-based integration. Experience working with containerization technologies such as Docker; exposure to Kubernetes is a plus. Proficiency with JetBrains IntelliJ IDEA or comparable Java IDEs. Familiarity with agile methodologies (Scrum or Kanban) and working in agile development teams. Strong communication skills in Spanish and English, both verbal and written. WHAT WE OFFER Continuous training and professional development with our internal vacancies. Safe environment where we promote your health. Competitive economic offer with a base salary plus a variable for good performance. Hybrid model* of work and adapt your schedule according to your circumstances. Connect outside the office and practice sports with colleagues through company groups. Flexible remuneration that you can voluntarily allocate to transportation services, training, childcare, etc. Pension plans, life and accident insurance, personal loans and participation in company stock programs. Financial aid for schooling and other measures for families. *It is required to attend our offices in Madrid 2 times per week.