Test Engineer

  • 91370 Verrières-le-Buisson, France (PARIS)
  • International environment, French + Good English level is a plus
  • Space and Aviation manufacturing
  • Min 3 years of experience minimum
  • To be negotiated

We are hiring for a company which is a pioneering space technology company specializing in advanced propulsion systems for small satellites. They are global experts in satellite propulsion, pushing the boundaries of streamlined in-orbit mobility for the rapidly expanding satellite constellation industry. Their clients across the US, Europe, and Asia trust us to design and deliver high-performance, precision-engineered propulsion systems that push technological boundaries while meeting demanding timelines and budgets. They made history in 2019 and 2020 with the world’s first in-orbit demonstrations of a unique state-of-the-art fueled electric propulsion systems. Today, they are experiencing rapid growth, with over 300 systems ordered to date.

As a Test Engineer you will contribute to the reliability of cutting-edge space systems, playing a key role in the final validation of our products before they are delivered to our international customers.

As a part of the Production team, you will be in charge of the critical acceptance testing phase for our space propulsion systems. Your objective: to guarantee the conformity, reliability and performance of products before they are delivered to our customers. For that you will be responsible for defining the test schedule and monitoring the test equipment. You will also work closely with the production and product development teams to guarantee product quality and reliability. You will discuss the design of tests and their coverage directly with customers.

Key responsibilities:

  • Drafting test procedures, constantly adapting them to customer requirements
  • Optimising test scripts to improve coverage
  • Supervising final inspection/acceptance operations (telemetry, temperature, vibrations, etc.) carried out by technicians
  • Analysing results and sharing potential improvements
  • Writing test reports and validating them

Skills and qualifications:

  • Master’s degree in Engineering (Aerospace, Mechanical or related field) or a similar technical discipline is required.
  • Rigour, attention to detail and organisational skills
  • Autonomous but able to work as part of a team
  • Knowledge of vacuum techniques is a plus
  • English is a plus to facilitate communication with other teams

For more than ten years, I’ve been driven by one idea — the future of Space and Defense depends on the people behind it. My career began in technical recruitment, where I had the privilege to hire engineers designing cutting-edge systems for aerospace and advanced manufacturing.

Co-founding Demexios was a natural next step: a way to transform my industry knowledge and relationships into a dedicated structure that helps clients recruit faster, smarter, and with strategic alignment.
Over time, I built long-term partnerships with companies leading technological sovereignty — from NewSpace startups developing electric propulsion to defense integrators modernizing tactical and surveillance systems. These collaborations allowed me to form a powerful network of decision-makers, project leaders, and experts who now trust Demexios to deliver when precision truly matters.
Today, my role is not just to connect candidates and companies — it’s to ensure that every hire strengthens our clients projects.

Across the landscape of global security, Matthieu Konarzewski was forging his path in the defense sector. With a robust background collaborating with startups and international firms in software, health, fintech, and beyond, Matthieu honed his dual skills in technology and talent acquisition over several forging experience.

His story took a defining turn during a high-stakes engagement with defense contractors, where he specialized in sourcing profiles for mission-critical roles in ballistics, radar systems, and high-security embedded technologies. Imagine Matthieu navigating the complexities of international defense networks, identifying experts in GNC (Guidance, Navigation, and Control) and FPGA development to fortify teams against emerging threats. “I’ve learned how a talented team makes all the difference in achieving concrete results,” Matthieu shares, emphasizing his commitment to being a reliable partner in building resilient organizations.

His focus on defense profiles has led to seamless placements that enhance national security and industrial innovation, all while fostering long-term client relationships.