Full-Stack Software Engineer

What you'll do

Join CERN as a Full-Stack Software Engineer and help create the information systems that keep one of the world’s leading research centres running. You’ll develop enterprise applications built with Java and Spring, and modern front-end technologies such as React and TypeScript, in an agile, international team. Be part of the Business Computing Group and deliver solutions that support everything from HR and Finance to Logistics and Accelerator Operations.

You will engage in the development and enhancement of Java/Spring and React software solutions and their integration with 3rd party platforms. This includes participating in the complete lifecycle of software development, using modern agile methodologies, as well as being responsible for the successful delivery of the projects.

Your responsibilities

Develop and enhance the core framework for document workflow systems, focusing on clean, understandable, and reusable code.
Ensure all designs and implementations are well-documented to support long-term maintainability.
Design, implement, and integrate solutions within CERN’s software ecosystem and with third-party applications, ensuring seamless interoperability and performance.
Maintain and modernize legacy enterprise applications, improving their stability, scalability, and alignment with current technologies and best practices.
Own the full lifecycle of delivered solutions, including comprehensive testing, deployment, monitoring, and operational support.
Collaborate in feature analysis and design, evaluating alternative approaches to recommend optimal, future-proof solutions.
Contribute to a culture of excellence by participating in peer reviews, providing constructive feedback, mentoring junior developers, and promoting clean, sustainable coding practices.
Act proactively to identify and resolve technical challenges or blockers, ensuring that teammates stay aligned and achieve their goals effectively.

Still here? Let's make a quick check about

Your profile

Strong hands-on experience with Java, Spring, and RESTful API development and system integration.
Solid understanding of relational databases, data modelling, and PL/SQL.
Experience building modern frontends using React and state management libraries.
Proficiency with Git and familiarity with agile development practices.
Ability to apply clean code principles and software design patterns.
Strong problem-solving and analytical skills, with attention to software quality and maintainability.
Master's degree or equivalent relevant experience in the field of Computer Science or a related field.
Experience with CI/CD pipelines and container technologies (Docker, Kubernetes) would be an asset
Familiarity with event-driven architectures; and with software quality assurance tools is a nice-to-have.

Your skills

Knowledge of programming techniques and languages.
Knowledge and application of software life-cycle tools and procedures.
Development of application software.
Conceptualising, designing and developing user experiences and interfaces.
Re-use, refactoring, integration and porting of existing software.
Cooperating constructively with others in the pursuit of team goals; balancing personal goals with team goals; delivering presentations in a structured and clear way; adjusting style and content to the audience; responding calmly and confidently to questions.
Delivering high quality work on time and fulfilling expectations; taking responsibility for own actions and decisions.
Testing solutions for long-term suitability, cross-checking with all concerned before implementation.
Spoken and written English, with a commitment to learn French.

Ideal start date: 01/02/2026

Contract duration: 60

Grade range: 6

Benchmark job: 200020 - Computing Engineer

Job flexibility: Hybrid

Employment conditions

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

Global Benefits at CERN

A minimum entry-salary of 9113 Swiss Francs per month (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.

Let's get you ready

Be sure to meet the eligibility criteria

You are a national of a CERN Member State or Associate Member State.
You have relevant qualifications and professional experience.
If you have previously held a Staff contract at CERN, you will not be eligible for these positions.
Please pay attention to the additional criteria and requirements for this specific position and mentioned above.

You will need these documents to complete your application

Your CV (English or French)
Any document you consider relevant to your application

Your CERNDepartment

The FAP department ensures the effective management of CERN’s financial resources, maintains accurate financial data, and provides reliable information systems to support the organisation’s business processes and project management.

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!

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Still have a doubt ? Here are the most frequently asked questions

What should I expect during my first week at CERN?

Your onboarding at CERN includes a comprehensive induction programme, which starts with an official welcome session at the beginning of each month. In addition, you will receive important information both before and after your arrival to ensure a smooth transition into your new role. This process is designed to help you get acquainted with CERN’s environment, your team, and the tools and systems you’ll be using.
How big would the team be?

The size of the team you'll be working with at CERN depends on the specific role and department. Some teams are small and highly specialized, while others are larger and more interdisciplinary. During the interview process, you'll have the opportunity to learn more about the team structure for the position you are applying for.
What is the working language at CERN?

The working languages at CERN are English and French. However, it is not always mandatory to speak both languages to work at CERN. We offer language training to help you acquiring the other language.
What support does CERN provide for relocation?

CERN does not offer direct assistance with relocation. However, depending on your role and specific criteria, you may be eligible for certain benefits such as an installation allowance and coverage of travel expenses to join CERN. These benefits are designed to help ease the transition when relocating to the Geneva area. For more information, please consult the “Salary, Benefits and Support“ page.
Do I need a visa to work at CERN?

Whether you need a visa to work at CERN depends on your nationality and the duration of your stay. CERN assists with the necessary visa and work permit processes for its employees and visitors. The specific requirements will be communicated to you during the recruitment process.
What would my salary be?

Salaries at CERN are determined by a structured scale. Salaries are based on your role, qualifications, and experience, and are not subject to negotiation. Specific details will be provided as your application progresses. For more information, please refer to the dedicated page.