Senior Mechanical Engineer

About the role

You will own the complete mechanical development lifecycle for high-precision free-space optical systems that connect Earth and space in a next-generation LEO satellite constellation. This role requires a seasoned professional who is unapologetically curious and 100% committed to saving space, protecting our planet, and turning connectivity into actionable intelligence. You will act as the mechanical authority, ensuring that designs are not only innovative but also practical, reliable, and manufacturable in the demanding space environment. The position is fundamental to Espace's mission of making connectivity from space universally accessible, secure, and actionable, bridging Earth and space for hyper-scaled IoT deployments. You will translate abstract concepts and system requirements into robust mechanical architectures that survive launch and operate flawlessly in orbit. Collaboration is at the heart of this role, as you will integrate feedback from Optics, Thermal, Electronics, Systems, AIT, and Manufacturing to solve complex opto-mechanical challenges. Your work will directly enable sustainable spacecraft systems and portable end-user devices that extend global satellite coverage beyond legacy limitations. Ultimately, you will be responsible for taking designs from early engineering units through to flight hardware, embodying a true design-to-manufacturing mindset.

Key facts

What you'll do

Conduct detailed mechanical analysis and trade studies to define the optimum architecture for opto-mechanical assemblies within strict mass and volume constraints for LEO operations.

Develop, validate, and document mechanical requirements in close coordination with the Optics team to ensure alignment with free-space optical performance, stability, and pointing accuracy objectives.

Lead the design for manufacturing (DFM) process for space-qualified components, actively collaborating with manufacturing and fabrication teams to streamline production and reduce costs.

Partner with the AIT group to develop comprehensive assembly, integration, and test procedures that ensure mechanical designs are feasible, verifiable, and repeatable on orbit.

Define and maintain mechanical interfaces and standards across satellite subsystems, working closely with Systems Engineering to ensure seamless integration of optical payloads.

Perform rigorous mechanical testing and analysis, including structural, thermal-vacuum, and vibration testing, to verify that flight hardware meets all mission-specific environmental and operational requirements.

Manage the mechanical supply chain by liaising directly with suppliers to qualify materials, processes, and components critical to the performance and longevity of the optical systems.

Implement and maintain rigorous configuration and data management practices for all mechanical designs, ensuring traceability from early concept iterations through to final flight acceptance documentation.

Drive the resolution of complex mechanical issues that arise during prototyping, testing, or early orbit operations, applying root cause analysis and rapid corrective actions.

Champion sustainability initiatives by selecting materials and manufacturing processes that minimize environmental impact and support Espace's commitment to saving space and protecting the planet.

Mentor junior engineers by providing technical guidance, design reviews, and constructive feedback to elevate the overall capability of the mechanical engineering team in Toulouse.

Utilize advanced CAD, simulation, and analysis tools to create detailed 3D models, drawings, and technical documentation that accurately represent mechanical designs and support downstream activities.

Proactively identify mechanical risks and opportunities for innovation, proposing mitigation strategies and alternative solutions that enhance system performance and manufacturability.

Serve as the primary mechanical contact for cross-functional discussions, ensuring that mechanical integrity is considered throughout the entire product lifecycle from concept to deorbit.

Requirements

Demonstrated experience as a mechanical engineer, with a strong background in space, aerospace, or high-tech opto-mechanical systems relevant to LEO satellite operations.

Possess a deep understanding of mechanical design principles, materials science, and manufacturing processes, specifically as they apply to demanding space environments and optical systems.

Show proficiency in mechanical analysis, simulation, and testing, with the ability to interpret results and make informed design decisions that ensure mission success.

Have a proven track record of taking products from concept through to flight hardware, demonstrating a design-to-manufacturing mindset and meticulous attention to detail.

Exhibit strong collaboration skills, working effectively with cross-functional teams including Optics, Thermal, Electronics, Systems, AIT, and Manufacturing to solve complex problems.

Embody Espace's core values of intentionality, curiosity, and a 100% commitment to saving space, protecting our planet, and turning connectivity into actionable intelligence.

Communicate effectively in English, both verbally and in writing, to articulate technical concepts, lead discussions, and produce clear, concise documentation for diverse audiences.

Are comfortable working in a fast-paced, dynamic environment where priorities can shift quickly and adaptability is essential for project success.

Nice to have

Experience with free-space optical communication systems or deep space optical link technologies.

Familiarity with space certification processes such as ECSS standards and heritage components commonly used in LEO constellations.

Practical notes

Hours are flexible but expect availability during core business hours.

This role is based in Toulouse, France.

Candidates must be eligible to work in France without sponsorship.

The role involves collaboration with international teams across multiple time zones.