Full-Stack Software Engineer

Employment Type: Contract Company Description At CERN, the European Organization for Nuclear Research, physicists and engineers are probing the fundamental structure of the universe. Using the world's largest and most complex scientific instruments, they study the basic constituents of matter - fundamental particles that are made to collide together at close to the speed of light. The process gives physicists clues about how particles interact, and provides insights into the fundamental laws of nature. Introduction Build software that powers science Join CERN as a Full-Stack Software Engineer and help create the information systems that keep one of the world’s leading research centres running. You’ll develop enterprise applications built with Java and Spring, and modern front-end technologies such as React and TypeScript, in an agile, international team. Be part of the Business Computing Group and deliver solutions that support everything from HR and Finance to Logistics and Accelerator Operations. You will engage in the development and enhancement of Java/Spring and React software solutions and their integration with 3rd party platforms. This includes participating in the complete lifecycle of software development, using modern agile methodologies, as well as being responsible for the successful delivery of the projects. Functions Develop and enhance the core framework for document workflow systems, focusing on clean, understandable, and reusable code. Ensure all designs and implementations are well-documented to support long-term maintainability. Design, implement, and integrate solutions within CERN’s software ecosystem and with third‑party applications, ensuring seamless interoperability and performance. Maintain and modernize legacy enterprise applications, improving their stability, scalability, and alignment with current technologies and best practices. Own the full lifecycle of delivered solutions, including comprehensive testing, deployment, monitoring, and operational support. Collaborate in feature analysis and design, evaluating alternative approaches to recommend optimal, future‑proof solutions. Contribute to a culture of excellence by participating in peer reviews, providing constructive feedback, mentoring junior developers, and promoting clean, sustainable coding practices. Act proactively to identify and resolve technical challenges or blockers, ensuring that teammates stay aligned and achieve their goals effectively. Qualifications Master's degree or equivalent relevant experience in the field of Computer Science or a related field. Experience Essential skills: Strong hands‑on experience with Java, Spring, and RESTful API development and system integration. Solid understanding of relational databases, data modelling, and PL/SQL. Experience building modern front‑ends using React and state management libraries. Proficiency with Git and familiarity with agile development practices. Ability to apply clean code principles and software design patterns. Strong problem‑solving and analytical skills, with attention to software quality and maintainability. Nice to have: Experience with CI/CD pipelines and container technologies (Docker, Kubernetes). Familiarity with event‑driven architectures; and with software quality assurance tools. Technical competencies Knowledge of programming techniques and languages. Knowledge and application of software life‑cycle tools and procedures. Development of application software. Conceptualising, designing and developing user experiences and interfaces. Re‑use, refactoring, integration and porting of existing software. Behavioural competencies Working in Teams: cooperating constructively with others in the pursuit of team goals; balancing personal goals with team goals. Achieving Results: delivering high quality work on time and fulfilling expectations. Demonstrating Accountability: taking responsibility for own actions and decisions. Communicating Effectively: delivering presentations in a structured and clear way; adjusting style and content to the audience; responding calmly and confidently to questions. Solving Problems: testing solutions for long‑term suitability, cross‑checking with all concerned before implementation. Language skills Spoken and written English, with a commitment to learn French. Additional Information Eligibility and closing date: Diversity has been an integral part of CERN's mission since its foundation and is an established value of the Organization. Employing a diverse workforce is central to our success. We welcome applications from all Member States and Associate Member States. This vacancy will be filled as soon as possible, and applications should normally reach us no later than 24.11.2025 at 23:59 CET. Employment Conditions Contract type: Limited duration contract (5 years). Subject to certain conditions, holders of limited‑duration contracts may apply for an indefinite position. Working Hours: 40 hours per week Job Flexibility: Hybrid This position involves: Work during nights, Sundays and official holidays, when required by the needs of the Organization. Job grade: 6-7 Job reference: FAP-BC-ENG-2025-232-LD Field of work: Software Engineering and IT Benchmark Job Title: Computing Engineer #J-18808-Ljbffr