Software Developer (Java & Angular) (BE-GM-APC-2026-151-GRAP)

Drive the modernisation of CERN's Geodetic Metrology data management system, migrating legacy Oracle APEX/PL/SQL applications to a Java/Spring Boot and Angular platform, while leading the redesign of a mission-critical application for CERN's Accelerator Complex.

- Analyse Oracle APEX pages, processes and PL/SQL packages to understand business workflows and data dependencies. - Implement Spring Boot REST APIs and Angular Frontend. - Write automated tests and apply software quality practices. - Participate in the whole software development lifecycle (requirements, design, development, testing), following a modern agile approach to ensure high-quality outcomes. - Interact with the end-users of the services to understand their needs and help translate those into appropriate software solutions. - Build strong partnerships with IT and multidisciplinary teams across CERN to ensure the delivery of reliable, maintainable, and scalable software solutions aligned with current needs and future strategic goals. - This role includes team supervision responsibilities. More information here .

- Proven experience in designing and developing software applications using Java technologies and modern JavaScript/TypeScript frameworks. - Practical experience with concurrent and multithreaded programming. - Experience applying software quality assurance practices and using related tools (code review, preparing tests, deliver high quality documentation, unit tests, clean code, sonarqube). - Experience in ICT systems architecture and design, including the design of scalable services and APIs. - Familiarity with CI/CD pipelines and automated build, test, and deployment workflows. - Experience with cloud-native technologies, including Kubernetes. - Knowledge of Oracle APEX would be an asset.

- Strong knowledge of the Spring framework ecosystem. - Strong knowledge of relational database systems, particularly Oracle Database, including proficiency in PL/SQL. - Ability to design reliable software services following SOLID principles or similar best practices. - Knowledge of software development lifecycle (SDLC) tools, methodologies, and procedures. - Ability to deliver high-quality work on time and meet expectations. - Contributes to a positive team environment through an optimistic and constructive attitude while proactively addressing issues. - Spoken and written English or French, with a commitment to learn the basics of the other language. Eligibility criteria: - You are a national of a CERN Member or Associate Member State . - You have a professional background in Software Engineering (or a related field) and have either: - a Master's degree with 2 to 6 years of post-graduation professional experience; - or a PhD with no more than 3 years of post-graduation professional experience. - You have never had a CERN fellow or graduate contract before.