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

Description

Job Summary: We are seeking a Senior Java profile for a technological project in the defense sector, developing critical backend solutions with real impact while applying best practices within a highly skilled technical team. Key Highlights: 1. Strategic and long-term project in the defense sector 2. Senior role with real technical influence 3. Highly skilled technical team DESCRIPTION We are looking for Senior Java profiles to join a technological project within the **defense sector**, in a highly demanding and regulated environment. You will work on developing 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 incorporation. **What will you do?** * Development of backend services using **Java 8\+ and Spring** * Design and optimization of **REST APIs** * Implementation of workflows using **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 **Desirable:** * Experience with **Quarkus (2\+ years)** * Knowledge of **Docker** * Use of tools such as **SonarQube** * Java or Agile certifications. **What do we offer?** * Direct incorporation into a **defense-sector technology multinational** * A **stable, strategic, and long-term project** * A **Senior role with real technical influence** * Hybrid modality: **3 remote days** * Highly skilled technical team