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Hadoop and Opensearch Operations Engineer (IT-DA-DS-2024-60-GRAE)

Geneva, Switzerland
a monthly stipend ranging between 5119 and 5631 Swiss Francs (net of tax).
Posting live until
18 Apr 2024

Job Details

Your responsibilities

Join CERN's Database and Analytics group, to operate and evolve two large-scale deployments of Hadoop and OpenSearch used by many IT services and across CERN's experimental programme. The Hadoop service provides an open-source, distributed storage, and computing framework for big data, managing close to 20 PB of data, and offering to its users different components such as HDFS, YARN, HBase, and Spark. The OpenSearch service offers centralised OpenSearch clusters to the CERN community, operating more than 100 clusters.

As a DevOps Engineer working in the Data Stores (DS) team, you will contribute to the operations of the Hadoop and OpenSearch services. You will participate in service and operating system upgrades, monitoring and configuration management improvements, hardware replacement campaigns, and security enhancements. You will also play a role in the evolution of the Hadoop and OpenSearch services, discussing and working with the team on various service enhancements, including the planned consolidation of the disaster recovery strategy.

As a DevOps team member, your role will include both operations tasks and software development in Python and Java. You will be working with open-source software and gaining experience with the IT infrastructure stack used at CERN, such as Alma9, OpenStack, Puppet, Prometheus, GitLab, etc.

Your profile

Skills and/or knowledge

  • Expertise in operating and optimizing large-scale production big data environments.
  • Work experience with Unix/Linux environments and systems administration. - Configuration management solutions such as Puppet and monitoring of distributed systems.
  • Programming techniques and languages, in particular Python, Java, or Bash programming.
  • Experience in Big Data technologies such as Hadoop and/or OpenSearch. 
  • Using, integrating, and contributing to open-source software projects.
  • Familiarity with Agile/Scrum methodologies and DevOps best practices.

Eligibility criteria:

  • You are a national of a CERN Member or Associate Member State.
  • By the application deadline, you have a maximum of two years of professional experience since graduation in Computer Engineering (or a related field) and your highest educational qualification is either a Bachelor's or Master's degree.
  • You have never had a CERN fellow or graduate contract before.
  • Applicants without University degree are not eligible.
  • Applicants with a PhD are not eligible.

Additional Information

Job closing date: 14.04.2024 at 12:00 AM (midnight) CET.

Job reference: IT-DA-DS-2024-60-GRAE

Contract duration: 24 months, with a possible extension up to 36 months maximum.

Target start date: 01-August-2024

What we offer

  • A monthly stipend ranging between 5119 and 5631 Swiss Francs (net of tax).
  • Coverage by CERN's comprehensive health scheme (for yourself, your spouse and children), and membership of the CERN Pension Fund.
  • Depending on your individual circumstances: installation grant; family, child and infant allowances; payment of travel expenses at the beginning and end of contract.
  • 30 days of paid leave per year.
  • On-the-job and formal training at CERN as well as in-house language courses for English and/or French.

About us

At CERN, the European Organization 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. Find out more on


Diversity has been an integral part of CERN's mission since its foundation and is an established value of the Organization. Employing a diverse workforce is central to our success.


CERN profileAt CERN, physicists and engineers use the world’s largest and most complex scientific instruments to study the basic constituents of matter – the fundamental particles – to probe the underlying structure of the universe.

Working at CERN
CERN is a truly unique organization. A genuine collaboration between countries, universities and scientists, driven not by profit margins, but by a commitment to create and share knowledge. At CERN, students, recent graduates and experienced professionals work together to push for immense scientific discoveries, answering some of life’s most complex questions and advancing the boundaries of human knowledge.

People are free to work creatively and to trust in, and rely on, their colleagues across the organization. History is being made at CERN – and the excitement is tangible, inspiring, overwhelming at times. It is the only place in the world that you can do this work in this way.

Why work for us
Today, CERN employs more than 2500 people, and if you visit us you will find more than 2500 different reasons why CERN is such a great place to work. Six key reasons that we believe will make you love working here are: challenge; purpose; imagination; integrity; collaboration; and quality of life.

Student and graduate schemes
CERN technical and administrative internships and graduate schemes offer international students and recent graduates the opportunity to work with world-class scientists and engineers on cutting-edge research in particle physics, computational science, life sciences, engineering, international relations, and more. Whichever route you take, it will be an extraordinary experience.

What we are looking for
To conduct experiments of this scale and importance, CERN needs people from various career levels and with a wide range of abilities, skills and competencies. We have job opportunities for students, graduates and experienced professionals, from apprenticeships to PhDs (and beyond). Whatever your background, field of interest or diploma level, CERN could be the place for you.

Geneva, Switzerland

Number of employees
2500+ staff members; several hundred on graduate and student programmes

Positions recently recruited for
Computing engineer, radiofrequency engineer, process operator in cryogenics, web developer, mechanical engineer, administrative assistant, system administrator, power electronics engineer, scientific writer, applied physicist and many more

Desired degree disciplines/class
From apprenticeship to PhD in a wide variety of domains

How to apply
Apply online at

Closing date
All year round

Tel +41 22 76 63 786

Company info
+41 22 76 63 786
Esplanade des Particules 1
PO Box 1211
Geneva 23

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