Posted 4 weeks ago

Company Description

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.

Job Description

Within the Programme, we are looking for a Scientist or Software Engineer to join CERN.

The CMS Core Software Group is in charge of supporting the software development community of the CMS experiment. This mandate implies the development and monitoring of the CMS Offline Software (CMSSW) release integration and QA system. This activity consists in overseeing multiple, parallel development efforts by a rather large community making sure they converge into a deployable software product, CMSSW, which is used by the collaboration for Monte Carlo simulation, reconstruction, and analysis of the detector data. The successful candidate will be part of a stimulating environment with world class software experts.

You will take part in all aspects of the devops process, specifically:

  • Work closely with CMSSW development teams to help ensure end-to-end quality;
  • Build, maintain and scale infrastructure for Production and Development environments;
  • Maintenance of the external software stack for CMSSW, keeping track of updates and porting to new operating systems, toolchains (GCC/binutils/LLVM) and architectures;
  • Continually improve CI/CD tools, processes and procedures;
  • Develop and maintain CI/CD systems;
  • Write and maintain infrastructure documentation;
  • Work with third-party vendors to resolve infrastructure issues.


Eligibility criteria:

  • You are a national of a CERN Member or Associate Member State;
  • You have graduated, or are about to graduate, with a university degree (BSc or MSc level in computer science,engineering or another relevant course) and have no more than 4 years’ relevant experience after obtaining your degree;
  • Kindly note that experience prior to the latest obtained degree will not be taken into account for the calculation of your overall years of experience.

Essential skills and experience:

  • Excellent knowledge of Linux based environments;
  • Proficiency in shell/Python scripts programming;
  • Solid understanding of CI/CD concepts;
  • Experience with configuration management, cloud stack and Linux containers;
  • Good knowledge of build tools like cCMake, Make and Autotools;
  • You enjoy tackling new challenges.

Desired technical skills:

  • Familiarity with Git, GitHub/Lab and building/porting open source software;
  • Knowledge of the C++ programming language;
  • Knowledge of software debugging, profiling, and validation tools such as GDB, Valgrind, Address Sanitizer, Undefined Sanitizer, perf.

​​​​​​​Please note that CERN Staff members are not eligible to apply for a Fellowship.

Additional Information

CERN would very much like to benefit from your expertise, commitment and passion.

In return, CERN will provide you with:

  • An employment contract for between six months (minimum) up to a maximum of 36 months.
  • A stipend ranging from 5,281 to 6,558 Swiss Francs per month (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: an installation grant, family, child and infant allowances as well as travel expenses to and from Geneva.
  • 2.5 days of paid leave per month.

Your Life @CERN

Find out more here:

This is how you can apply:

You will need the following documents to complete your application:

  • A CV.
  • A scanned PDF of your most recent relevant qualification.

We recommend to add two recent letters of recommendation, giving an overview of your academic and/or professional achievements. You can upload these letters at the time of application if you have them to hand. You will also be provided with a link as soon as you have submitted your application to forward to your referees to upload their letters confidentially. Please note this must be done before the closing date.

All applications should reach us no later than 2 August 2020.

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