Backend Software Engineer Database Systems (OracleJava) (BE-CSS-IDELD)

Introduction:

You will design and evolve complex data models at the heart of CERNs accelerator control systems working on the database backend of large-scale mission-critical applications. Your work will focus on Oracle-based schemas and Java backend services exposing APIs to applications tightly integrated into full-stack software systems. 

Robust and scalable database systems are essential for control configuration and operational applications enabling the operation of CERNs accelerator complex. You will contribute to the evolution of these data-intensive systems working on long-lived data models and performance-critical access patterns. 

You will join a multidisciplinary team and play a key role in building reliable backend solutions aligned with users needs contributing to systems used at the worlds largest particle physics laboratory. 

Functions:

• Interact with stakeholders including end-users Product Owners and infrastructure providers to gather requirements.
• Design and implement reliable data models ensuring ACID properties.
• Develop and maintain APIs to access and manipulate data using CRUD operations including interfacing with AI systems.
• Analyse integration requirements across multiple technical domains and design and implement robust solutions.
• Contribute to all phases of the software development lifecycle from requirements analysis to deployment.
• Provide technical supervision and mentoring to junior software engineers.
• Provide day-to-day operational support to a large user community (500 users).
• Propose and contribute to the evolution of systems under your responsibility and beyond

Qualifications :

Masters Degree or equivalent relevant experience in the field of Computer Science or a related field

Experience:

• Experience developing high-performance relational databases with Oracle and/or PostgreSQL RDBMS.
• Experience in the design and evolution of data models in technical domains.
• Knowledge of designing and maintaining high-availability client-oriented APIs ideally REST- and gRPC-based.
• Experience in Java software development using Spring Boot JPA and Hibernate.
• Application of software quality assurance practices and associated tools.
• Use of CI/CD solutions to build test and deploy software to production.
• Practical experience in the use of PL/SQL is an advantage.

Technical competencies:

• Knowledge of programming techniques and languages.
• Design of databases/repositories.
• Architecture and design of ICT systems.
• Identification and selection of relevant emerging ICT technologies.
• Conceptualising designing and developing user experiences and interfaces.

Behavioural competencies:

• Demonstrating Accountability: working conscientiously and reliably; delivering on promises.
• Achieving Results: delivering high quality work on time and fulfilling expectations.
• Working in Teams: contributing to promoting a positive atmosphere in the team through an optimistic and constructive attitude; addressing issues.
• Solving Problems: adopting a pragmatic approach; understanding the value of adopting generic rather than gold -plated technical solutions.

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 CERNs 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 03.05.2026 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.

Job grade: 6-7

Job reference: BE-CSS-IDELD

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 CERNs 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:

Remote Work :

No

Employment Type :

Contract