Ready to code your way into the future of aerospace? We are looking for a Java Backend software Engineer for one of our client in Esch-sur-Alzette. Freelance contract or permanent contract via a payrolling company Daily rate between 500 and 550EUR Annual gross salary between 80 000EURand 90 000EUR English fluent is mandatory Esch-sur-Alzette is emerging as a European hub for aerospace innovation, offering you a unique opportunity to gain hands-on experience in a rapidly growing sector, positioning you for exciting future projects in space and advanced technologies. Main misssions You join a collaborative software engineering team where DevOps practices, code reviews, and continuous improvement are part of the daily routine. It's a space where technical excellence is expected-and supported. You translate business requirements into robust technical solutions, giving you the opportunity to shape features from concept to deployment. You design and implement HOOP (Highly Object-Oriented Programming) services, taking full ownership of their architecture, development, and documentation. You work closely with front-end developers to ensure seamless integration and optimal performance across the stack. You build Cloud Native solutions on AWS (and other platforms), deepening your expertise in scalable, modern cloud architectures. You integrate third-party tools to enhance functionality and streamline development-no need to reinvent the wheel. You modernize applications using containerization technologies, contributing to more efficient, portable, and reliable deployments. You be involved in writing tests and managing the release process, ensuring that quality and stability are never compromised. You troubleshoot and resolve bugs, with the support of a team that values clean, maintainable code. You'll contribute to maintaining environments and evolving our infrastructure, gaining hands-on experience with real-world DevOps challenges. You take ownership of the quality and delivery of your solutions, with the autonomy to make meaningful technical decisions. You share your knowledge and mentor others, in a culture that values continuous learning and collective growth. You help shape our technical roadmap and contribute to our tech radar, influencing the direction of our engineering practices. You actively participate in Scrum ceremonies, playing a key role in driving agile delivery and team alignment. Your profile Strong experience as a backend developer Experience in OO development and design patterns. Experience in designing, building and monitoring RESTful APIs and Microservices. Familiarity with cloud and application platforms Experience in unit and integration testing. Working experience in Agile / Scrum / DevOps teams. Technical environment : Java 21, Kotlin, Groovy, Spring Boot, Hibernate, JUnit / Spock, Cucumber, Gradle, RabbitMQ, PostgreSQL, ElasticSearch (OpenSearch), Prometheus, Grafana, Nginx, Traefik, Docker, Kubernetes, Amazon Web Services, Microsoft Azure Git, Python Hays plc est l'un des principaux groupes mondiaux de recrutement de professionnels. Hays est l'expert du recrutement de personnes qualifiées, professionnelles et compétentes dans le monde entier. Hays est le leader du marché au Royaume-Uni et en Asie-Pacifique et également l'un des leaders du marché en Europe continentale et en Amérique latine. Hays intervient pour le compte de milliers d’entreprises des secteurs privé et public, sur des postes en CDI, CDD, Travail Temporaire et Contracting. Hays France & Luxembourg compte aujourd’hui plus de 650 salariés répartis au sein de 22 bureaux (Aix-en-Provence, Amiens, Biarritz, Bordeaux, Clermont-Ferrand, Dijon, Grenoble, La Rochelle, Lille, Lyon, Montpellier, Nancy, Nantes, Nice, Paris, Reims, Rennes, Rouen, Strasbourg, Toulouse, Tours et au Luxembourg) couvrant 25 secteurs d’activité.