Plasma Physicist

  • 91370 Verrières-le-Buisson, France (PARIS)
  • International environment, Very good English
  • Space and Aviation manufacturing
  • Min 3 years of experience minimum
  • 58 000€ per year

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.

Your Mission 

In parallel, they have developed a series of plasma sources representing ionosphere and upper atmosphere for advanced space applications, being now in use by different research centres elsewhere. We are dedicated to shaping the future of space technology and are seeking a talented Plasma Physicist to join our Innovation Team.

As Plasma Physicist, you will be in charge of the development of new concepts and early-stage prototypes of plasma systems for ionosphere representation. You will also work on challenging beam and plasma diagnostic problems, ranging from plasma characterization to setting up home-made diagnostic tools like ExB and time-of-flight probes. By joining the Innovation Team, you will be at the interface between research and new product development, defining novel concepts and turning them into future cutting-edge technologies.

Main tasks and responsibilities

  • Plasma simulation (global models, PIC)
  • Design of proof-of-concept plasma systems.
  • Design and assembly of plasma diagnostics.
  • Conducting experimental campaigns.
  • Participate to the creation and protection of related intellectual property (patents, know-how) and dissemination activities (presenting at conferences, writing research and engineering articles).
  • Tightly collaborate with physicists and engineers in the innovation team to find solutions for complex multi-disciplinary topics through brainstorming and in-house research activities.
  • Everyday learning of new technologies and continuous improvement.
  • Regularly reporting to the Head of Innovation.

Required skills and qualifications

  • PhD degree in plasma physics.
  • Solid experimental plasma experience, 3+ years.
  • RF power skills is a plus.
  • Demonstrated ability to work independently.
  • Communicates in English fluently.

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.