Junior Python Developer (BE-CSS-GTA-2025-83-GRAE)

Job Description

• Help design and implement PyUI, a development environment supporting PyQt GUIs with accelerator- specific components.
• Develop the new Sequencer UI for editing and executing operational sequences, using PyUI as a base.
• Work closely with users to gather and refine requirements, then turn them into working applications.
• Create demos, examples, and documentation to support PyUI adoption by other developers.
• Collaborate with a team of experienced Python developers and UI designers to bring modern software practices to the accelerator control domain.
• Support the validation and evolution of PyUI based on real-world application feedback.

• Experience with Python 3.
• Knowledge of PyQT (or Qt).
• Previous experience in UX would be an asset.
• Spoken and written English or French, with a commitment to learn the basics of the other language.

• 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 Software Engineer (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

• A monthly stipend ranging between 5196 and 5716 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.