Full Stack Software Engineer (IT-CA-IR-2026-66-LD)

Are you an experienced Software Engineer passionate about full-stack web development and open-source technologies? Join a dynamic team at CERN, working on a large-scale open-source platform used daily by thousands of users worldwide. You will contribute to the evolution of the CERN Document Server (CDS), CERN's institutional repository, as it transitions to a modern platform based on InvenioRDM. CDS preserves and disseminates CERN's scientific, administrative, and multimedia output, ensuring long-term access to the organisation's intellectual and historical record. In this role, you will work at the core of CERN's digital repository ecosystem, helping to design, build, and operate a mission-critical service that supports Open Science at a global scale.

Functions

• Designing and developing new modules and functionalities for the CERN Document Server (CDS), while contributing to its underlying open-source platform, InvenioRDM.
• Collaborating with stakeholders to ensure CDS meets functional, usability, and service requirements.
• Performing DevOps activities, including service configuration, deployment, monitoring, and maintenance.
• Sharing expertise and collaborating with the wider InvenioRDM developer and open-source community.
• Migrating content and services from the current CDS to the new InvenioRDM-based repository platform.
• Providing user support and technical assistance to CDS users.
• Managing and reviewing code contributions in line with open-source development best practices., * Work during nights, Sundays and official holidays, when required by the needs of the Organisation.

Master's degree or equivalent relevant experience in the field of Software Engineering, Computer Science or a related field.

Experience:

• Strong experience in full-stack web application development for large-scale systems, including back-end services, front-end user interfaces, and database schema design as well as experience in working with REST APIs.
• Very advanced proficiency in Python, with solid knowledge of JavaScript and modern frameworks (e.g. React); documented experience with web frameworks like Flask or Django.
• Proven experience with relational databases, particularly PostgreSQL, and ORM frameworks (e.g. SQLAlchemy), as well as hands-on experience with ElasticSearch/OpenSearch.
• Hands-on experience with service deployment, configuration management, and operation in production environments, including container-based platforms such as Docker and OpenShift.
• Demonstrated experience working with users, including requirements gathering, user support, and training.
• Familiarity with modern web UI technologies and UX/usability best practices.
• Experience contributing to open-source and/or distributed software projects, with the ability to collaborate effectively across teams.

Technical competencies:

• Knowledge of programming techniques and languages.
• Design of databases/repositories.
• Knowledge of system configuration tools.
• Capturing and analysis of requirements for ICT systems.

Behavioural competencies:

• Achieving Results: having a structured and organised approach towards work; being able to set priorities and plan tasks with results in mind.
• Solving Problems: identifying, defining and assessing problems, taking action to address them.
• Working in Teams: building and maintaining constructive and effective work relationships.
• Communicating Effectively: providing others with timely information.
• Learning and Sharing Knowledge: keeping up-to-date with developments in own field of expertise and readily absorbing new information.

Language skills:

Spoken and written English, with a commitment to learn French.

• A competitive salary (tax free), increasing in line with your years of relevant experience.
• 30 days of paid leave per year plus 2 weeks annual closure.
• Coverage by CERN's comprehensive health insurance scheme (for yourself, your spouse and children), and membership of the CERN Pension Fund.
• Family, child and infant monthly allowances depending on your individual circumstances.
• A relocation package (installation grant, removal, travel expenses) depending on your individual circumstances.
• Possibility to extend your contract up to 8 years + eligibility for indefinite contract tenure.

Imagine taking part in the largest scientific experiment in the world. CERN needs more than physicists and engineers - if you're a student, a graduate, just starting your career or an experienced professional, whatever your field of expertise, CERN could be your next opportunity.