Job Description

Your responsibilities

The CERN Analysis Preservation (CAP) platform enables LHC collaborators and physics groups to preserve and internally share all information required to perform and reproduce analyses, including data locations, software versions, configuration files, presentations, and notes. The platform is integrated with existing CERN tools and built on the Invenio digital library framework, and is already in production.

You will combine Computer Science and Software Engineering skills. Working closely with junior and senior engineers and collaborating with CERN's experimental teams, they will focus on frontend development while contributing to backend features, maintaining existing services, and deploying high-visibility functionalities into production.

Key Responsibilities:

• Develop and implement new frontend and backend features for the CAP platform.
• Maintain and improve existing services, ensuring reliability, performance, and scalability.
• Collaborate with engineering teams and experimental collaborators to gather requirements and deliver effective solutions.
• Participate in testing, deployment, and continuous integration to ensure high-quality releases.
• Support documentation and knowledge sharing within the team.

Your profile

Skills:

• Proficiency in Python frameworks such as Django or Flask, and modern frontend development with React;
• Strong understanding of relational databases (preferably PostgreSQL) with the ability to craft efficient and optimised SQL queries;
• Experience with version control systems (Git) and collaborative workflows using platforms like GitHub;
• Excellent teamwork, multitasking, and problem-solving skills;
• Nice to have: exposure to Kubernetes (K8s) and/or experience working with large language models (LLMs);
• 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: 04.11.2025 at 23:59 CET.

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

Working hours: 40 hours per week

Target start date: 01-December-2025

Job reference: RCS-SIS-TS-2025-216-GRAE

Field of work: Software Engineering and IT

What we offer

• A monthly stipend ranging between 5196 and 5716 Swiss Francs (net of tax).
• Coverage by CERN's comprehensive health scheme (for yourself, your spouse and children), and membership of the CERN Pension Fund.
• Depending on your individual circumstances: installation grant; family, child and infant allowances; payment of travel expenses at the beginning and end of contract.
• 30 days of paid leave per year.
• On-the-job and formal training at CERN as well as in-house language courses for English and/or French.

About us

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. Find out more on http://home.cern.

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.