Senior Java Backend Developer – Cloud-Native Microservices & Cryptography

G+D hace más segura la vida de miles de millones de personas en todo el mundo. Creamos confianza en la era digital con tecnologías de seguridad integradas en tres áreas de negocio: Seguridad Digital, Plataformas Financieras y Tecnología Monetaria. Hemos sido un socio confiable para nuestros clientes durante más de 170 años con nuestras soluciones innovadoras para SecurityTech! Somos un grupo tecnológico internacional y una empresa familiar tradicional con más de 14,000 empleados en 40 países. Crear Confianza es nuestro camino hacia el éxito. La confianza es la base de nuestra cooperación en G+D. ¿Quizás es pronto para ti también? Position: Senior Java Backend Developer – Cloud-Native Microservices & CryptographySummary We are looking for a Senior Java Backend Developer to lead the design, development, and maintenance of secure, scalable, cloud-native microservices for our Trusted Service Manager (TSM) platform. This role focuses on backend development with Spring Boot 4, cryptographic operations, automation, and test-driven practices in a Kubernetes-based environment.Key Responsibilities Lead the end-to-end development and implementation of TSM backend services and microservices.Design, develop, and optimize robust Java backend applications using:Spring Boot 4 (including Spring Boot Actuator)Spring CloudSpring Data Implement and maintain API-first architectures (REST, OpenAPI), ensuring clear contracts and maintainable integrations.Build, deploy, and operate cloud-native applications using:Docker containersKubernetes (K8s)CI/CD pipelines and automation tooling Implement secure cryptographic operations, including:PKI-based workflowsX.509 certificate lifecycle managementEncryption, signing, and key management best practices Design data models and access layers using MongoDB for scalable, high-performance storage.Drive automated testing and quality assurance:TDD and BDDUnit, integration, and end-to-end test automationSecurity testing (SAST, DAST) Apply and advocate agile methodologies (Scrum), engineering best practices, and secure coding standards.Collaborate closely with architects, product owners, QA engineers, and other developers to deliver high-quality solutions.Guide and mentor other team members, promoting knowledge sharing and continuous improvement.Contribute to observability and operations using Spring Boot Actuator and monitoring/logging tools. Required Skills & Experience University degree in Computer Science, Software Engineering, or a related field.Extensive experience as a senior backend Java developer.Strong, hands-on expertise with:Spring Boot (v4), including Spring Boot ActuatorSpring Cloud and Spring Data Professional experience designing and implementing microservices in cloud-native environments.Proficiency in MongoDB, including schema design, performance tuning, and operational considerations.Solid knowledge of Docker and Kubernetes for containerized deployments and orchestration.Proven track record building API-first solutions:RESTful servicesOpenAPI/Swagger specifications Deep understanding of cryptography concepts and tooling:PKI, X.509 certificatesSecure key management and cryptographic protocols Experience in agile teams (Scrum) with:TDD and BDDAutomated testing strategiesSecurity testing (SAST, DAST) Familiarity with large-scale, high-availability, enterprise-grade systems.Hands-on experience with Atlassian and DevOps tooling:Jira, ConfluenceGit (GitLab/GitHub)SonarQube, Jenkins, Nexus, Maven Strong problem-solving skills, with the ability to troubleshoot complex distributed systems.Excellent communication skills and a collaborative, team-oriented mindset.Fluent English (spoken and written). Nice to Have Experience developing SDKs (Java or other languages) for external integration.Knowledge of client application development (e.g., mobile or desktop clients interacting with backend APIs).Background in financial services, payment systems, or digital currency projects. This role is ideal for a senior backend engineer who enjoys working on secure, high-availability microservices, is comfortable with advanced cryptography, and wants to drive automation and quality across the entire delivery lifecycle. What we offer CULTURE: Join a professional, dynamic environment where collaboration, teamwork, and innovation are valued.PHILOSOPHY: Be part of a team where your ideas and contributions have real impact.SCHEDULE: Mon–Thu 8:30–17:30h, Fri 8:30–15:30h (1h flexible start time). Hybrid work options available.CONTRACT & BENEFITS: Permanent contract, annual training plan, summer intensive schedule, company parking, flexible compensation (transport, childcare, training, health insurance).CANTEEN: Onsite cafeteria with breakfast and lunch at subsidized prices.LOCATION: El Prat de Llobregat, Mercabarna exit. Accessible via Bus 88/110 from Barcelona or PR4 from El Prat. Código de identificación: 27756 Tu contacto en recursos humanos: RRHH Team ¿Estás interesado/a en dar el siguiente paso en tu carrera? Por favor, inscríbete a la vacante. Gracias.