Full-stack Developer

Introduction

Are you a skilled full-stack developer who enjoys taking ownership of real-world services? Join CERN’s Platforms & Workflows group in the IT department, where we build and operate the Identity and Access Management systems used daily by thousands of researchers, engineers, and collaborators. You will work in an environment where engineering quality truly matters, and where your code directly enables world-class research.

You will join a supportive team of experienced developers and service managers who value collaboration, continuous learning, and thoughtful engineering. The role offers the opportunity to deepen your full-stack expertise while gaining hands-on experience with modern service operations, security practices, and large-scale digital identity systems.

Functions

• Design, develop and maintain modern web applications built on a .NET backend and React frontend.
• Participate in architectural decisions and contribute to the technical evolution of the IAM platform.
• Participate in service operations, including deployments, troubleshooting, monitoring, and continuous improvements.
• Support and guide junior team members, sharing best practices and contributing to a positive engineering culture.
• Collaborate closely with users and stakeholders: provide advanced user support, gather requirements and enhance the service to meet the evolving needs of the organisation.
• Ensure quality and reliability through documentation, testing, and adherence to security standards.

Qualifications

Master's degree or equivalent relevant experience in the field of Computer Science or a related field.

Experience:

• Demonstrated experience in development and maintenance of web applications using modern backend and frontend technologies (e.g. .NET, Java, React, relational databases).
• Experience contributing to the architecture and technical design of software systems.
• Experience operating software services (debugging, deploying, monitoring, upgrading).
• Ability to engage with users, understand requirements, and provide high?quality support.

Technical competencies:

• Knowledge of programming techniques and languages, advanced knowledge of .NET, C# (or Java), relational databases and SQL (Oracle, MySQL or similar), ReactJS.
• Administration of computing systems, upgrades, application of security patches, system and data migrations, backup and recovery, monitoring and alerting.
• Knowledge and application of software life-cycle tools and procedures, proficiency with Git, CI/CD tools, containerised deployments.
• Knowledge of best practices for implementing ICT security standards and policies.
• Capturing and analysis of requirements for ICT systems.

Behavioural competencies:

• Achieving Results: delivering high quality work on time and fulfilling expectations.
• Working in Teams: working well in groups and readily fitting into a team; participating fully and taking an active role in team activities.
• Communicating Effectively: demonstrating a pro-active approach to resolving differences; addressing issues of conflict constructively.
• Demonstrating Flexibility: adapting quickly and resourcefully to shifting priorities and requirements.
• Learning and Sharing Knowledge: sharing knowledge and expertise freely and willingly with others; coaching others to ensure knowledge transfer.

Language skills:

Spoken and written English, with a commitment to learn French.

Additional Information

Eligibility and closing date:

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. We welcome applications from all Member States and Associate Member States.

This vacancy will be filled as soon as possible, and applications should normally reach us no later than 01.06.2026 at 23:59 CEST.

Employment Conditions

Contract type: Limited duration contract (5 years). Subject to certain conditions, holders of limited-duration contracts may apply for an indefinite position.

Working Hours: 40 hours per week

Job Flexibility: Hybrid

This position involves:

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

Job grade: 6-7

Job reference: IT-PW-IAM-2026-100-LD

Field of work: Software Engineering and IT

Benchmark Job Title: Computing Engineer

Global Benefits

• A competitive salary (tax free), increasing in line with your years of relevant experience.
• 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, removal, travel expenses) depending on your individual circumstances.
• Possibility to extend your contract up to 8 years + eligibility for indefinite contract tenure.

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