**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.

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**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).

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**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!

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*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.*