Senior Quantum Software Engineer (Quantum Software Stack) - M/W

Senior Quantum Software Engineer (Quantum Software Stack) - M/W Participez au développement rapide d’une start-up deep-tech à l’avant-garde de la seconde révolution quantique ! About PASQAL PASQAL builds neutral-atom quantum computers and the full software stack required to run impactful hybrid quantum-classical workloads. Our quantum software ecosystem spans open- and closed-source libraries, developer tooling, documentation, and production-grade interfaces used by internal teams and external users. Job description As a Senior Quantum Software Engineer, you will develop, optimize, and maintain PASQAL’s ecosystem of quantum solver libraries: libraries featuring algorithms for neutral-atom quantum computers. This includes classical and quantum algorithms for graph machine learning, optimization, and quantum simulation use cases. You will bridge research and production engineering: turning algorithmic ideas into robust, maintainable, well-tested software, while ensuring interoperability across the software stack and strong developer experience. Key Responsibilities Improve performance, reliability, and maintainability of production codebases. Transfer research ideas from quantum algorithm teams into production-grade code. Produce structured, documented, tested implementations with strong quality standards. Ensure interoperability of the application software stack with other libraries. Actively contribute to the development and productization strategy of the quantum software stack. Drive strong API UX with clear migration paths, versioning, and breaking-change management. Support backwards compatibility and deprecation practices. Promote best practices for benchmark design and statistical rigor. Contribute to backend/platform engineering topics: job orchestration, reliability, observability. Support packaging and release engineering Apply security-minded engineering practices (dependency scanning, SBOMs, SAST/CodeQL mindset). Required Qualifications Education & experience Master’s degree in Physics, Mathematics, Computer Science, or equivalent. Minimum 5 years of software development experience in industry/research/open-source projects. Software engineering excellence Strong experience with software best practices in collaborative environments (code review, CI/CD, testing). Excellent writing of production-level Python. Preferred / Nice-to-have Open-source contributions. Quantum computing knowledge. Backend/platform experience (API design, services, reliability/observability). Packaging & release engineering (wheels, manylinux, dependency constraints, deprecations). Security & software supply-chain practices. Familiarity with optimization (MILP/MIQP, constraint programming, metaheuristics) and/or OR frameworks. Familiarity with ML frameworks (e.g., PyTorch, JAX). What we offer Offices in Palaiseau, France Type of contract: permanent A dynamic and close-knit international team A key role in a growing start-up Recruitment process An interview with our Talent Acquisition Specialist of 45'. An exchange with our Hiring Manager A technical assessment A meeting with the team in our offices and a meeting with our Chief Software Officer An offer! PASQAL is an equal opportunity employer. We are committed to creating a diverse and inclusive workplace, as inclusion and diversity are essential to achieving our mission. We encourage applications from all qualified candidates, regardless of gender, ethnicity, age, religion or sexual orientation. Department Software Role Quantum Application Locations Massy/Palaiseau, France Remote status Hybrid Employment type Full-time Department Algorithms & Use Cases Team Quantum Software Seniority Senior About Pasqal Joining Pasqal will give you the opportunity to take an active part in the rapid development of a DeepTech scale-up at the forefront of the second quantum revolution. You will be directly involved in one of the biggest challenges shaping the technological landscape of the 21st century. You will be working as part of a team of top-level scientists and engineers, in direct competition with the world's biggest players. Founded in 2019 Co-workers about 300