Senior Java Backend Developer — Barcelona | Hybrid (3 remote / 2 on-site)

Description

Job Summary: We are seeking a Senior Java professional for a technological project in the defense sector, developing critical backend solutions and applying best practices within a highly skilled technical team. Key Highlights: 1. Stable, strategic, and long-term project in the defense sector 2. Senior role with real technical influence and development of critical solutions 3. Highly skilled technical team with hybrid work model DESCRIPTION We are looking for Senior Java professionals to join a technological project within the **defense sector**, in a highly demanding and regulated environment. You will work on the development of critical backend solutions with real impact, where code quality, best practices, and the ability to contribute technically within the team are highly valued. Barcelona (Carrer de Roc Boronat, 133\) 5 vacancies \| Immediate hiring. **What will you do?** * Development of backend services using **Java 8\+ and Spring** * Design and optimization of **REST APIs** * Implementation of workflows with **Kafka** * Application of best practices: **Clean Code, SOLID, TDD, BDD** * Mentoring of junior/intermediate profiles * Participation in **Scrum / Kanban / SAFe** environments REQUIREMENTS * \+5 years as a Java backend developer * Solid experience with **Java 8\+ and Spring** * Relational databases (**PostgreSQL**) * Experience in **testing (TDD / BDD)** * Design and management of **REST APIs** * Experience in **technical mentoring** * Experience with **Kafka** * Work in agile environments **Nice-to-have:** * Experience with **Quarkus (2\+ years)** * Knowledge of **Docker** * Use of tools such as **SonarQube** * Java or Agile certifications. **What do we offer?** * Direct employment with a **global technology company in the defense sector** * A **stable, strategic, and long-term project** * A **Senior role with real technical influence** * Hybrid work model: **3 days remote** * Highly skilled technical team