Computing and Software Engineer (LHCb Trigger System)

What you'll do

In this role you will lead the design, development, and optimization of software frameworks and reconstruction algorithms for the LHCb High Level Trigger and Real-Time Analysis. Your work will ensure efficient, high-performance data processing during LHC Run 4 (2030-2033) and prepare the computing systems for the increased demands of Run 5 (2036-2041).

Your responsibilities

Play a leading role in the development, operation, and consolidation of the LHCb High-Level Trigger and Real-Time Analysis systems during Run 4, laying the foundation for the next phase
Design, develop, and optimize next-generation software frameworks and reconstruction algorithms to meet the increased performance and scalability requirements of Run 5
Implement and validate algorithms that take full advantage of modern, highly parallel computing architectures, including multi-core CPUs and GPUs, to process data in real time
Profile, monitor, and optimize software performance to ensure efficiency, reliability, and scalability under high-throughput, high-luminosity conditions
Engage in performance studies and R&D to explore emerging technologies and methods that can enhance real-time data processing capabilities for future LHCb upgrades
Collaborate closely with physicists, computing experts, and detector specialists to translate experimental and physics requirements into robust and efficient computing solutions
Contribute to all stages of the software development lifecycle - from requirements gathering and design to implementation, testing, deployment, and long-term maintenance
Participate in the integration and validation of new software releases within large-scale distributed computing environments
Ensure high-quality documentation of software components, maintain configuration control, and contribute to internal knowledge sharing
Promote best practices in coding, testing, and software design, fostering a culture of collaboration and continuous improvement across the team
Provide technical support and mentorship to team members and collaborators, helping to disseminate expertise within the LHCb computing community

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Your profile

Extensive experience in software development of High Energy Physics (HEP) event data processing frameworks. Experience with the LHCb software is an advantage
Proven understanding of HEP high-level trigger and offline event selection frameworks, and of event selection criteria
Experience with developing software for heterogenous architectures
Experience in software engineering practices (test driven development, version and release management, quality assurance)
Familiarity in HEP data calibration and/or analysis procedure
Master's degree or PhD or equivalent relevant experience in the field of Physics or Computer Science or a related field.

Your skills

Simulation, design and development of trigger, data acquisition chains:
Testing, diagnosing and optimization of software:
Development of application software:
Knowledge of programming techniques and languages:
Delivering high quality work on time and fulfils expectations; having a structured and organised approach towards work; being able to set priorities and plan tasks with results in mind.
Supporting and acting in accordance with team decisions; accepting joint responsibility for team successes and shortcomings; debating at the table and engaging in constructive confrontation of ideas.
Readily absorbing new techniques and working practices; proposing new or improved ways of working.
Presenting information accurately and objectively; taking initiative beyond regular tasks and making things happen.
Spoken and written English, with a commitment to learn French.

Ideal start date: 01/03/2026

Contract duration: 60

Grade range: 6

Benchmark job: 200020 - Computing Engineer

Job flexibility: Hybrid

Team supervision

Employment conditions

Shift work, when required by the needs of the Organization.
Participation in a regular stand-by duty, including nights, Sundays and official holidays.

Global Benefits at CERN

A minimum entry-salary of 9113 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.

Let's get you ready

Be sure to meet the eligibility criteria

You are a national of a CERN Member State or Associate Member State.
You have relevant qualifications and professional experience.
If you have previously held a Staff contract at CERN, you will not be eligible for these positions.
Please pay attention to the additional criteria and requirements for this specific position and mentioned above.

You will need these documents to complete your application

Your CV (English or French)
Any document you consider relevant to your application

Your CERNDepartment

The EP department conducts research in experimental particle physics and serves as a key reference center for the European physics community, contributing to the education and training of young scientists.

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!

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Still have a doubt ? Here are the most frequently asked questions

What should I expect during my first week at CERN?

Your onboarding at CERN includes a comprehensive induction programme, which starts with an official welcome session at the beginning of each month. In addition, you will receive important information both before and after your arrival to ensure a smooth transition into your new role. This process is designed to help you get acquainted with CERN’s environment, your team, and the tools and systems you’ll be using.
How big would the team be?

The size of the team you'll be working with at CERN depends on the specific role and department. Some teams are small and highly specialized, while others are larger and more interdisciplinary. During the interview process, you'll have the opportunity to learn more about the team structure for the position you are applying for.
What is the working language at CERN?

The working languages at CERN are English and French. However, it is not always mandatory to speak both languages to work at CERN. We offer language training to help you acquiring the other language.
What support does CERN provide for relocation?

CERN does not offer direct assistance with relocation. However, depending on your role and specific criteria, you may be eligible for certain benefits such as an installation allowance and coverage of travel expenses to join CERN. These benefits are designed to help ease the transition when relocating to the Geneva area. For more information, please consult the “Salary, Benefits and Support“ page.
Do I need a visa to work at CERN?

Whether you need a visa to work at CERN depends on your nationality and the duration of your stay. CERN assists with the necessary visa and work permit processes for its employees and visitors. The specific requirements will be communicated to you during the recruitment process.
What would my salary be?

Salaries at CERN are determined by a structured scale. Salaries are based on your role, qualifications, and experience, and are not subject to negotiation. Specific details will be provided as your application progresses. For more information, please refer to the dedicated page.