Junior Full-Stack Software Engineer (FAP-BC-DL-2026-143-GRAE)

Employment Type: Full-time

Are you a motivated Software Engineer with a passion for delivering complex and compelling information systems end-to-end? Are you at ease with server-side technologies, and also with writing frontends in JavaScript and not afraid to optimise database queries, to dive into data integration processes or configure and debug messaging/eventing systems? Do you enjoy working in an agile environment and a self-organised team?

Then join our team of talented engineers and contribute to application software for CERN's Corporate Information Systems. CERN, take part!

You will join the Business Computing ( BC ) group in the Finance and Administrative Processes ( FAP ) department, where 80+ talented international colleagues are responsible for delivering information systems for all of CERN's business functions.

The product management-driven Business Computing Group is working for clients across the whole organisation (HR, Finance, Planning, Safety, Security, Purchasing, Logistics, and Accelerator Operations).

The type of products under the group's responsibility range from custom-made solutions for a few users to large and widely integrated systems with 15,000+ users. Hence, working for the BC group provides numerous perspectives for being in touch with different technologies and business areas.

As a Full-Stack Software Engineer in the Business Computing group, you will be part of a self-organised agile team responsible for the design, implementation, configuration and support of software solutions used across all of CERN.

Your responsibilities :

• Design and develop full-stack enterprise applications.
• Implement and test software solutions.
• Develop frontend and backend features.
• Optimise SQL queries and database integrations.
• Configure and debug integration/messaging systems.
• Provide user and production support.
• Work in an agile self-organised team.
• Contribute to continuous process improvement.
• Participate in knowledge sharing activities.
• Maintain and enhance legacy applications.
• Use CI/CD and containerised development workflows.
• Collaborate with Product Managers and stakeholders.

Your profile:
If you are excited about this role but your past experience does not align perfectly with every qualification in the job description, we encourage you to apply anyway. You may just be the right candidate for this or other roles.

• Experience developing full-stack enterprise applications using Java, Spring Boot, and JavaScript frontend frameworks (e.g. React).
• Experience with build, test, and deployment toolchains.
• Experience working with SQL and relational databases and Java database integration.
• Experience working in agile development teams.
• Experience with modern development workflows including Git, CI/CD (e.g. GitLab), containerisation, and GitOps.
• Experience maintaining and implementing features in legacy applications.

Skills:

Required:

• Full-stack development with Java, Spring Boot, JavaScript, React, and similar frameworks.
• Understanding of modern software design and architecture principles and patterns, and their. application in the Java and JavaScript ecosystems.
• Knowledge of Git or equivalent VCS.

Nice to have:

• Knowledge of CI/CD tools like GitLab or equivalent.
• Knowledge of containerised software solutions.
• Knowledge of GitOps software development workflows.
• Knowledge of Power BI or a similar reporting solution.
• Knowledge of PL/SQL.
• Knowledge of cloud migrations of on-premise software.
• 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 / Computer 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: 14.06.2026 at 23:59 CET.
Contract duration: 24 months, with a possible extension up to 36 months maximum.

Job flexibility: Hybrid

Target start date: 01-November-2026 (or earlier)

Positions available: 3

This position involves:

• Work during nights, Sundays and official holidays, when required by the needs of the Organization.

Job reference: FAP-BC-DL-2026-143-GRAE

Field of work: Software Engineering and IT

Benchmark job: 200020 - Computing Engineer

Global Benefits

• A monthly stipend between Se telefonnummer på studerendeonline.dk 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