Full Stack Software Engineer (IT-CA-IR-2026-66-LD)

Company Description

At CERN , the European Organisation 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. 

Job Description

Introduction

Are you an experienced Software Engineer passionate about full-stack web development and open-source technologies? Join a dynamic team at CERN, working on a large-scale open-source platform used daily by thousands of users worldwide.

You will contribute to the evolution of the CERN Document Server (CDS), CERN’s institutional repository, as it transitions to a modern platform based on InvenioRDM. CDS preserves and disseminates CERN’s scientific, administrative, and multimedia output, ensuring long-term access to the organisation’s intellectual and historical record.

In this role, you will work at the core of CERN’s digital repository ecosystem, helping to design, build, and operate a mission-critical service that supports Open Science at a global scale.

Functions

• Designing and developing new modules and functionalities for the CERN Document Server (CDS), while contributing to its underlying open-source platform, InvenioRDM.
• Collaborating with stakeholders to ensure CDS meets functional, usability, and service requirements.
• Performing DevOps activities, including service configuration, deployment, monitoring, and maintenance.
• Sharing expertise and collaborating with the wider InvenioRDM developer and open-source community.
• Migrating content and services from the current CDS to the new InvenioRDM-based repository platform.
• Providing user support and technical assistance to CDS users.
• Managing and reviewing code contributions in line with open-source development best practices.

Qualifications

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

Experience:

• Strong experience in full-stack web application development for large-scale systems, including back-end services, front-end user interfaces, and database schema design as well as experience in working with REST APIs.
• Very advanced proficiency in Python, with solid knowledge of JavaScript and modern frameworks (e.g. React); documented experience with web frameworks like Flask or Django.
• Proven experience with relational databases, particularly PostgreSQL, and ORM frameworks (e.g. SQLAlchemy), as well as hands-on experience with ElasticSearch/OpenSearch.
• Hands-on experience with service deployment, configuration management, and operation in production environments, including container-based platforms such as Docker and OpenShift.
• Demonstrated experience working with users, including requirements gathering, user support, and training.
• Familiarity with modern web UI technologies and UX/usability best practices.
• Experience contributing to open-source and/or distributed software projects, with the ability to collaborate effectively across teams.

Technical competencies:

• Knowledge of programming techniques and languages.
• Design of databases/repositories.
• Knowledge of system configuration tools.
• Capturing and analysis of requirements for ICT systems.

Behavioural competencies:

• Achieving Results: having a structured and organised approach towards work; being able to set priorities and plan tasks with results in mind.
• Solving Problems: identifying, defining and assessing problems, taking action to address them.
• Working in Teams: building and maintaining constructive and effective work relationships.
• Communicating Effectively: providing others with timely information.
• Learning and Sharing Knowledge: keeping up-to-date with developments in own field of expertise and readily absorbing new information.

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 Organisation. 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 22.04.2026 at 23:59 CEST.

Employment Conditions

Contract type: Limited duration contract (3 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 Organisation.

Job grade: 6-7

Job reference: IT-CA-IR-2026-66-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