Senior Java Backend Engineer

👀 Are you looking for a new professional challenge as a Java Backend Engineer? We have an opportunity that might interest you! 🚀 About Us At ALTIA, we are more than 4,000 professionals across 25+ locations in 9 countries. We design and develop innovative digital solutions for over 1,000 organizations that drive change. 🌍 Our purpose: to grow by helping others grow — sustainably and long-term. 💡 Our values — commitment, closeness, innovation, and collaboration — guide us every step of the way. Learn more 👉 https://www.altiacompany.com/ What are we looking for? We are looking for a Senior Java Software Engineer to join an international project for a major European organization, working on high-impact international projects. You will be responsible for the design, development, maintenance, and security of back-end applications and services using Java technologies, including the development and integration of REST APIs and web services, database design, and collaboration throughout the software development lifecycle. MUST have for this challenge ✅ EQF Level 7 qualification + a minimum of 15 years of professional IT experience.English or French level B2 or higher, both spoken and written.Strong experience in back-end development with Java.Experience with Spring Boot and Hibernate.Experience with WebLogic, Kafka, JEE, and EJB.Experience with relational databases such as PostgreSQL, Oracle, or MySQL. Experience with complex SQL and database design.Experience designing, building, and securing REST APIs and web services.Experience with OpenAPI / Swagger documentation.Experience with CI/CD and build tools such as Maven, GitLab, Bamboo, Jenkins, and Nexus.Knowledge of application security practices, including input validation, authentication and authorization.Experience or knowledge of OAuth 2.0, OpenID Connect, and JWT.. Nice to have NoSQL databases: MongoDB, CouchDB, and CosmosDB.Experience with ALM tools such as Jira, Git.Experience with unit and integration testing using JUnit and Mockito, and code analysis tools such as SonarQube, SonarLint, or HP Fortify.Knowledge of SOA architectures, service buses, microservices, and distributed systems.Experience with Docker and Kubernetes for development and deployment, as well as basic cloud service configuration.Experience working in Agile and Scrum environments, including code reviews, mentoring, technical onboarding, requirements refinement, and estimation.Knowledge of public grant management, public audits, European open-source/eUI projects, and workflow orchestration tools such as Camunda or Activiti will be highly valued. What do we offer? 🚀 Participation in an international project. Far-site working model, with remote work, Brussels as the delivery location, and regular onsite presence. Flexible working hours. Stable, long-term project. Professional development plan. Continuous training. 🎯 Are you interested in working on an international project where you can challenge yourself and continue growing professionally? We’d love to meet you! Apply for this opportunity or contact us directly and we’ll tell you more. This job offer has been drafted in accordance with the principles of impartiality and non-discrimination based on gender, race, ideology, or any other reason. In particular, it complies with current regulations regarding gender equality between women and men (Royal Decree-Law 6/2019).