full stack software Engineer

Located on the Paris-Saclay plateau, about 20 kilometers from the capital, the SOLEIL synchrotron is one of France's leading research facilities. Since it began operating in 2008, it has served the national and international scientific communities. Research conducted at SOLEIL covers a wide range of scientific and industrial fields — including physics, biology, chemistry, materials science, environmental science, Earth sciences, and cultural and natural heritage — all connected to current societal challenges. Experiments carried out on the beamlines rely on the use of synchrotron light emitted by electrons accelerated to nearly the speed of light within a storage ring. SOLEIL is jointly supervised by the CNRS and the CEA and offers its staff a dynamic, innovative, multidisciplinary, and international working environment.

At the forefront of technology, SOLEIL II is an ambitious project designed to provide new opportunities for scientific and industrial research. SOLEIL II consists of a major upgrade of the existing infrastructure and aims to significantly improve the performance of electron accelerators and beamlines. It is designed to address major current and future societal challenges, particularly in areas such as advanced materials research, energy and sustainable development, health and well-being, and the environment.

Construction work on the SOLEIL II project began in 2024, marking the start of a phase of development and technological innovation. In parallel, the existing facility will remain operational until the fall of 2028. SOLEIL II is scheduled to start operations in 2030, with a gradual ramp-up phase continuing until 2035.

Context and missions

You want to achieve personal growth and take on new challenges within an enthusiastic, multidisciplinary team with recognized expertise. Join the ISAC group (Acquisition and Control Systems Engineering), where you will work alongside about twenty IT experts. You will discover the stimulating nature of our collaborative projects within the framework of the SOLEIL II upgrade project.

The challenges associated with this role include:

• Designing, developing, testing, and deploying APIs and web applications, and integrating Grafana for the data collection and archiving service of control systems (based on TANGO and PostgreSQL databases) to configure data collection and visualize data.
• Integrating into the SOLEIL information system and deploying web applications (APIs and GUIs) provided by CERN under Docker to control the future power supplies of SOLEIL II magnets.
• Implementing software stacks to collect, store, and visualize various TANGO metrics from control systems (OpenTelemetry or Prometheus collectors).
• Deploying a data catalog tool for the qualification measurements of SOLEIL II equipment.
• Deploying a catalog of experimental data and an application to track samples on the SOLEIL beamlines.

To carry out our ambitious projects, you will work within project teams responsible for integrating these software stacks and applications, composed of other IT and scientific experts from the beamlines or accelerators.

Profile

Qualifications: Master’s degree (Bac+5) or PhD in Computer Science or Software Engineering, with 3 years of professional experience.

To successfully carry out this role, the candidate should have expertise in:

• Software development in Java, Python, JavaScript, and TypeScript.
• Mastery of microservices architectures.
• Development of REST (OpenAPI) and GraphQL APIs, and associated frameworks such as SpringBoot or FastAPI.
• Web interface development with frameworks such as React.js or Vue.js.
• Proficiency with software development tools and methodologies (IDEs, Git, testing strategies, Maven, Conda, pip, npm, etc.).
• Strong knowledge of relational databases and ORMs (PostgreSQL, MariaDB) and NoSQL databases (MongoDB, Redis, Elasticsearch, etc.).
• Docker, Docker Compose, and containerization principles.
• Application security: OWASP Top 10, authentication & authorization (OAuth2, OpenID Connect), secret management, certificate management.
• Concepts and architectures for monitoring and observability, and associated technologies (Prometheus, OpenTelemetry, Grafana, ELK stack, etc.).

Personal qualities we value:

• Team spirit.
• Autonomy, rigor, curiosity, and creativity.
• Kindness, active listening, and service orientation.
• Analytical skills and ability to communicate findings effectively.

Working conditions

This is a fixed-term contract for a defined purpose (CDDOD) of 3 years. The position is based in Saint-Aubin (Essonne), at the SOLEIL Synchrotron.

If you are looking for a position in a company built on the pillars of scientific excellence and technological innovation, SOLEIL offers you the opportunity to:

• Work within an innovative, multidisciplinary, and multicultural research laboratory.
• Be at the heart of the research and development dynamics of the Paris-Saclay cluster.
• Collaborate with national and international experts across diverse scientific and technical fields.
• Take advantage of Paris being only 25 km away, offering rich cultural experiences and a vibrant lifestyle.
• Undertake short trips within France or Europe.

Benefits

• 26 days of paid vacation + up to 2 additional split days + 23 RTT (reduction of working time) days per full year of work, based on a 40-hour work week.
• Mandatory health insurance (basic plan) costs €20.35 per month for the employee (with an employer contribution of €174.15, corresponding to 90% of the premium), covering household members (spouse/partner + children).
• We also offer an optional supplementary health plan covering your household (spouse/partner + children).
• Access to a provident scheme that supplements the benefits of the mandatory French Social Security system, which are often insufficient. It compensates for loss of income in case of inability to work, ensuring the standard of living of the insured and their family in difficult circumstances: death, incapacity for work, or disability resulting from illness or accident.
• Possibility to open a Time Savings Account (CET) after one year of seniority.
• On-site corporate catering at SOLEIL, with subsidized meals.
• Family-related benefits depending on individual situations: family allowance supplement, additional days off under certain circumstances, marriage and birth bonuses, etc.
• Social and cultural activities offered by SOLEIL’s Social and Economic Committee (CSE).