Full Stack Web Developer (EP-AID-DA-2025-102-GRAE)

Job Description

Your responsibilities

The ALICE experiment at CERN has recently completed a major upgrade, entering a new operational phase in 2022. Central to this upgrade is a cutting-edge computing system capable of handling data throughput nearly 100 times greater than before. Supporting this transformation is a modern, evolving web-based toolset that provides centralised access to scientific and operational metadata, aids data acquisition, and streamlines reporting for teams and management.

We are looking for a motivated developer to join us in CERN's Experimental Physics Department.

Your key responsibilities will include:

• Developing, maintaining, and enhancing web applications supporting the ALICE experiment;
• Designing and deploying new features to improve data access, validation workflows, and decision support for researchers and management;
• Collaborating closely with end-users and experts to gather requirements, incorporate feedback, and refine tool usability;
• Ensuring the reliability, performance, and maintainability of applications in a production setting;
• Working alongside developers, analysts, and operations teams to integrate back-end services and data workflows;
• Utilising relational databases and modern web technologies such as Node.js, ES6 JavaScript, Webpack, and Virtual DOM.

Your profile

Skills:

• Required skills and experience:
  • Solid experience in front-end and back-end web development with ability to build interactive and user-friendly web-based user interfaces;
  • Proficiency in modern programming techniques and languages, including JavaScript, JSX, Node.js, and Express;
  • Experience with RESTful APIs and asynchronous programming patterns;
  • Ability to write clean, maintainable, and well-documented code.
• Optional skills and experience:
  • Experience with software development life cycle practices and tools such as Git, automated testing frameworks (e.g. Mocha), browser automation (e.g. Puppeteer), and Continuous Integration pipelines;
  • Knowledge of relational databases, particularly MariaDB, and experience writing efficient, secure SQL queries;
  • Understanding of component-based architectures and front-end frameworks (e.g., React, Lit, or similar);
  • Experience working in collaborative, interdisciplinary environments, providing user support or technical guidance.
• 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 Software Engineering (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: 25.06.2025 at 23:59 CEST.

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

Working hours: 40 hours per week

Target start date: 01-September-2025

Job reference: EP-AID-DA-2025-102-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.