Your mission As an

RF Power Systems Engineer , you will contribute to the development of Kreios Space's electric propulsion systems for Very Low Earth Orbit (VLEO).

Your mission will be to support the development, integration, and validation of the RF power system that enables plasma generation and sustainment in our air-breathing electric propulsion technology. You will work on the architecture and performance of RF generators, matching networks, RF power delivery chains and their interaction with plasma loads. You will also serve as the primary technical interface with external suppliers responsible for the development of the Power Processing Unit (PPU), ensuring alignment with system requirements and supporting integration, testing and verification activities. You will work closely with propulsion, plasma physics, avionics and systems engineering teams in a highly hands‑on environment, helping transform cutting‑edge plasma propulsion concepts into robust flight hardware.

Your profile Specific Knowledge

Strong understanding of RF engineering fundamentals, including power transmission, impedance matching and RF system characterization

Experience with RF power generation and delivery systems

Knowledge of matching networks and RF coupling techniques for complex or dynamic loads

Experience working with RF generators, amplifiers and high-power RF hardware

Experience with High Voltage systems and associated safety requirements

Experience with MOSFET-based switching circuits

Ability to review electrical schematics, technical documentation and supplier designs

Experience defining and executing test campaigns and analyzing experimental data

Basic programming or scripting skills (Python, MATLAB or similar)

Nice to Have





Understanding of plasma-RF interactions or willingness to develop expertise in this area

Electric propulsion systems

Plasma sources or plasma processing equipment

RF plasma generation systems

Space hardware development

EMC/EMI engineering

ECSS standards

Supplier management and technical coordination

Reliability, FMEA and failure investigations

Interpersonal Skills

Strong systems‑thinking mindset and ability to understand interactions across complex subsystems

Proactive and hands‑on approach to solving technical challenges

Methodical and detail‑oriented, particularly when working with high‑voltage equipment

Comfortable collaborating within multidisciplinary engineering teams

Strong communication skills, capable of challenging suppliers constructively and driving technical discussions

Adaptable and resilient in a fast‑moving startup environment

Positive attitude, constructive sense of humor and ability to contribute to a healthy and enjoyable work environment

Why us?

Work on real space hardware that will fly in orbit, not just simulations or papers

Be part of a fast‑growing European space startup shaping the future of sustainable space operations

Take ownership of a critical subsystem at the heart of our propulsion technology

Help build Kreios Space's internal expertise in high‑voltage power electronics and electric propulsion

Join a highly collaborative, respectful and supportive team where knowledge is shared openly

Enjoy a great work environment that values trust, autonomy, learning and good energy at work

Strong technical growth path in a scaling company, where your work has visible impact and you actively help shape both the technology and the way we work

📌 RF Power Systems Engineer (Madrid)
🏢 Kreios Space
📍 Madrid