System Engineer – Satellite propulsion

  • 91370 Verrières-le-Buisson, France (PARIS)
  • International environment, Very good English
  • Space and Aviation manufacturing
  • Min 5 years of experience minimum
  • 66 000€ per year

We are hiring for a company which is a pioneering space technology company specializing in advanced propulsion systems for small satellites. We are global experts in satellite propulsion, pushing the boundaries of streamlined in-orbit mobility for the rapidly expanding satellite constellation industry. Our 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. We made history in 2019 and 2020 with the world’s first in-orbit demonstrations of iodine-fueled electric propulsion systems. Today, we are experiencing rapid growth, with over 300 systems ordered to date.

Your Mission 

As a System Engineer you will actively design, build and test new concepts of plasma propulsion systems, closely collaborating with several physicists and engineers in the Innovation team. You will be involved in making proof-of-concept systems of the new company products, validating them and preparing the documentation, as well as creating the company IP elements. You will work on the projects covering variety of engineering and scientific disciplines, ranging from chemistry and elementary physics, to electronics and thermal design.

You are expected to have a good understanding of electronics, covering basic breadboard design and prototyping/debugging. We therefore expect you to have an experience in either industrial system design or DIY projects with electronic components. Basic embedded programming skills (Arduino or generic uC) would be a big plus. You will directly work on the prototypes you create, and we expect that you have excellent manual skills and pride in what you do.

Key Responsibilities

  • Conceptual design of the propulsion systems and their elements
  • Basic simulation using existing tools: electronic circuits, thermal
  • Breadboard design of electronics (power & signal) for the propulsion systems
  • Assembly and experimental testing of the propulsion systems using vacuum setups, performance characterization and enhancement
  • Multidisciplinary testing of various system elements
  • Coordination of projects within the Innovation team
  • Document writing and reporting

Required skills and qualifications

  • PhD or Master in applied physics, aerospace system engineering or general engineering
  • Solid understanding of electronics, ability to create test boards and simple control systems
  • RF and power electronics experience is a plus
  • Ability to learn fast and adjust to constantly changing environment within the Innovation team
  • Good skills in precise handwork and assembling
  • Knowledge of aerospace systems

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.