Job Description

Your responsibilities:
Join the Collaboration at CERN as a Full Stack Developer, being in charge of the development and maintenance of the core data analysis system for one of the world's largest heavy-ion experiments.
You will ensure high performance, scalability, and reliability of tools processing massive datasets while collaborating closely with physicists and computing experts.
Key Responsibilities:

• Act as lead developer of the ALICE analysis system including optimization and maintenance. In charge of the web front-end (React) and Linux backend (Java, PostgreSQL, Bash).
• Ensure system scalability and performance for processing over 100 PB of input data per month.
• Assure optimal use of the GRID resources.
• Collaborate with physicists and computing specialists to understand and implement new requirements.
• Provide user support and troubleshoot operational issues.
• Monitor system usage and anticipate challenges due to increasing demand from 400+ active users.

Your profile:
Skills:

• React, JavaScript, TypeScript, CSS, HTML
• Java, PostgreSQL and Bash
• Basic Linux administration knowledge is a plus
• Spoken and written English, with a commitment to learn French.

Eligibility criteria:

• You are a national of a

. * By the application deadline, you have a maximum of two years of professional experience since graduation in Software engineering, 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: 10.11.2025 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-April-2026
Job reference: EP-AIP-PAP-2025-199-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
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.

Skills Required