Job Summary: We are seeking a Senior Backend Engineer with experience in critical systems, microservices, databases, messaging, and Kubernetes orchestration. Key Highlights: 1. Backend development for critical systems and regulated environments 2. Proficiency in microservices, Kubernetes, Docker, and CI/CD 3. Experience with MongoDB, Kafka, OAuth2, and security methodologies MANDATORY REQUIREMENTS: * University degree in Computer Engineering, Telecommunications, or related technical fields. * Minimum 5 years of backend development experience for critical systems, preferably within public administration or regulated environments. * Proven expertise in developing, deploying, and managing microservices (Spring Boot, Docker/Kubernetes, RESTful architectures). * Solid experience with MongoDB and other non-relational databases, as well as relational databases. * Experience integrating and managing advanced messaging systems (Kafka, MQ queues) and event-driven programming. * Expert knowledge and hands-on experience with Kubernetes for orchestrating, deploying, monitoring, and auto-scaling applications and microservices in cloud and on\-premise environments. * Advanced proficiency in Docker, deployment automation, and CI/CD pipelines. * Experience using JPA (Java Persistence API) and documenting APIs via Swagger/OpenAPI. * Implementation of session management and secure user authentication (Keycloak, OAuth2, JWT). * Proficiency with professional development tools and environments (Eclipse, IntelliJ, Git, Maven, Jenkins). * Strong commitment to quality, security, and documentation, including adherence to standards such as OWASP and ENS compliance.