Full-Stack Web Developer (SY-EPC-CCS-2026-155-GRAE)

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CERN is seeking a full‑stack web developer to own and evolve web tools used by converter experts to keep power converters running smoothly. You’ll build front ends in Vue3, back ends in Python FastAPI, and design databases in PostgreSQL or Oracle, while gathering user requirements and providing application support in an agile Scrum setting. You may lead sprints and own a subset of applications, collaborating with a cross functional team. The role prioritizes UI/UX, REST API design, and robust database work, with DevOps familiarity a plus. To apply, highlight concrete projects with end users, show sprint leadership, and demonstrate collaboration with scientists; ensure eligibility: two years or less since graduation, a Bachelor’s or Master’s, CERN member state nationality, and willingness to learn French. Deadline 28 June 2026.

Job Description

As full-stack developer in the Tools Team at SY-EPC-CCS, you'll become the main responsible for a set of crucial web applications used by converter experts to ensure smooth operation of the power converters at CERN. You'll be working closely with other team members, applying an agile work approach and work on different products in sprints (Scrum).

Your responsibilities

• Working on front-ends in JavaScript (Vue3.js).
• Working on back-ends in Python (FastAPI).
• Working on databases in SQL (PostgreSQL / Oracle).
• Gathering and iterating over requirements and features with our users and stakeholders (Power Converter Experts).
• Providing application support to converter experts / users (debugging, fixing, etc.).
• Collaborating closely in a team of developers who are working on the full stack of web applications, using the Scrum framework.
• Own a subset of our full-stack web applications and lead sprints on them.

More information here.

Your profile

• Experience with UI/UX design and web front-end development.
• Experience with web back-end (REST API) design and development.
• Experience with database design and development.
• Experience with identifying user requirements.
• Knowledge of or experience with DevOps (CI/CD, Docker, Compose, Kubernetes) would be an advantage.

Skills

• JavaScript / TypeScript (Vue3.js, Pinia, Vite).
• Python (FastAPI, SQLAlchemy, Pydantic, asyncio).
• SQL (PostgreSQL, Oracle).
• Spoken and written English, with a commitment to learn French.

Eligibility criteria:

• You are a national of a CERN Member or Associate Member State.
• By the application deadline, you have a maximum of two years of professional experience since graduation in Computer Science (or a related field) and your highest educational qualification is either a Bachelor's or Master's degree.
• You have never had a CERN fellow or graduate contract before.
• Applicants without University degree are not eligible.
• Applicants with a PhD are not eligible.

Additional Information

Job closing date: 28.06.2026 at 23:59 CEST.

Contract duration: 24 months, with a possible extension up to 36 months maximum.

Working hours: 40 hours per week

Job flexibility: Hybrid

Target start date: 01-November-2026

This position involves:

• Stand-by duty, when required by the needs of the Organization.

Job reference: SY-EPC-CCS-2026-155-GRAE

Field of work: Software Engineering and IT

Benchmark job: 200020 - Computing Engineer

Global Benefits

• A monthly stipend between 5266-5793 Swiss Francs per month (tax free) depending on your degree.
• 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 and travel expenses) depending on your individual circumstances.
• Possibility to extend your contract up to 36 months.
• On-the-job and formal training including language classes.

Overview of CERN - Discover a world where the impossible is made possible!

At CERN, the European Organization for Nuclear Research, we are pushing the frontiers of science and technology. Our groundbreaking work brings together not only physicists but also a diverse range of professionals from engineering, technical, scientific, and administrative fields. Together, we foster an environment where innovation and collaboration thrive.

Every day, we face exciting new challenges and opportunities to contribute to cutting-edge research that shapes our understanding of the universe. We meet these challenges through the diverse perspectives within our teams, ensuring every contribution is valued and driving our shared sense of inclusion and purpose. Diversity is a core value of CERN since its foundation, and it remains central to our mission and continued success.

If you are ready to be part of a dynamic, inclusive community pushing the boundaries of knowledge, CERN is the place where your curiosity and skills can thrive. Be part of our mission to uncover what lies at the heart of the universe! TAKE PART!

More information about us, here: careers.cern