Big Data Software Engineer

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., * 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)., * You are a national of a CERN Member State or Associate Member State . Currently, we cannot consider applications from Pakistani and Lithuanian nationals for positions with a 2026 start date, as the ceiling defined under Article II.5 of the Associate Membership Agreement has been reached.

• 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.

Your skills

• 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.

• A minimum entry-salary of 9236 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.

The BE department is at the heart of CERN's accelerator complex. Its mission is to lead the development, construction, and operation of advanced particle accelerators, and to provide cutting-edge technology solutions that enable new discoveries in fundamental physics. Committed to promoting a culture of excellence, creativity and collaboration, individuals from diverse backgrounds contribute to the advancement of science and technology, as well as engaging in scientific education, outreach, and broader knowledge and technology transfer initiatives. 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!