Job Summary: We are looking for a JAVA - C++ Developer with experience in messaging systems; knowledge of revenue collection systems will be valued, to join our team. Key Highlights: 1. Access to training 2. Permanent contract with Arelance 3. Opportunity for professional development JAVA \- C\+\+ Developer At Arelance, we know that people are the most important asset within a company; therefore, we invest significant effort in identifying the best professionals for our clients and offering our candidates the best projects. Currently, we are seeking to hire a JAVA \- C\+\+ Developer What are we looking for in you? * Minimum 3 years of experience * Messaging (REST API, MQTT, WS) Experience with Revenue Collection Systems (systems related to public transportation) will be valued **Desirable:** * Quarkus and Spring Boot frameworks * Knowledge of JavaScript, TypeScript, Angular, and React * Familiarity with Jira * Knowledge of Software Version Control (preferably GIT) * Knowledge of Continuous Integration/Continuous Deployment (Jenkins, Docker, Kubernetes...) * Experience in application testing (unit tests, integration tests...) (Mockito, Google Test) * Understanding of design patterns and Clean Code principles * Use of Docker, CI/CD * Proficiency with Visual Studio Code IDE and CMakeLists What do we offer in this position? * Permanent contract with Arelance * Access to training * Work modality: Hybrid in Barcelona (50% remote) If you are interested in an outstanding opportunity like this one, apply now! We want to meet you! Only candidates with valid work and residence permits in Spain will be considered java, c\+\+, api rest, MQTT