Big Data Software Engineer (BE-CSS-IDELD)

Introduction

You will play a major role in the evolution of non-relational data stores and big data platforms based on technologies such as Hadoop and Spark. You will apply your software engineering expertise to large and long-lived data platforms high-throughput ingestion pipelines performance-critical access patterns and demanding reliability requirements. Your work will directly support the operation monitoring and analysis of particle accelerator systems through the management of multi-petabyte datasets accumulated over many years.

Functions

• Drive the evolution of the CERN Accelerator Archival system (NXCALS). 
• Design and develop the core components of the system including ingestion pipelines (ETL) metadata services data compaction mechanisms data extraction algorithms and APIs. 
• Collaborate with different user communities to define and promote best practices for using NXCALS in the development of control applications for the CERN Control Centre. 
• Work closely with the CERN IT department to select and validate evolution of the underlying storage technologies (e.g. HDFS ClickHouse). 
• Contribute to the operation maintenance and user support of the system. 
• Keep watch on relevant big-data technologies and assess their applicability to NXCALS. 
• Mentor and technically support junior software engineers contributing to these activities. 
• Contribute to the development of other Controls data engineering platforms according to overall priorities.

Qualifications :

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

Experience:

• Extensive experience in Java development using the Spring ecosystem. 
• Solid knowledge of big-data technologies including Hadoop HDFS or Apache Ozone HBase or ClickHouse Apache Spark and Kafka. 
• Working knowledge of Python including SDK development and PySpark. 
• Proven experience with modern software engineering practices including quality assurance CI/CD and DevOps methodologies. 
• Experience in the design deployment and operation of complex high-availability systems. 

Technical competencies:

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

Behavioural competencies:

• Solving Problems: adopting a pragmatic approach; understanding the value of adopting generic rather than gold -plated technical solutions.
• Working in Teams: contributing to promoting a positive atmosphere in the team through an optimistic and constructive attitude; addressing issues.
• Demonstrating Flexibility: adapting quickly and resourcefully to shifting priorities and requirements.
• Achieving Results: defining clear objectives milestones and deliverables before initiating work/ project.
• Demonstrating Accountability: working conscientiously and reliably; delivering on promises.

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 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 (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:

• A valid driving licence.
• Stand-by duty when required by the needs of the Organisation.

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