As an

RF 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

design, simulation, assembly and testing of RF and microwave antennas

used in our air-breathing plasma thrusters, helping transform advanced research into robust, flight-ready hardware. You will work closely with propulsion, plasma physics and systems teams in a hands-on environment, contributing to laboratory testing, data analysis and design iterations. Degree in

Electrical Engineering, Telecommunications, Physics

or a related field Background in

RF/microwave engineering or antennas , gained through professional experience, research or academic projects Strong interest in

space technologies, electric propulsion and experimental work Comfortable working in a laboratory environment and interacting with hardware Fluent in

English We are open to candidates at different levels of experience. The role and responsibilities can be adapted based on seniority. Specific Knowledge

RF and microwave fundamentals (impedance matching, S-parameters, antennas) Experience with

electromagnetic simulation tools

(HFSS, CST, COMSOL or similar) Hands-on experience with

RF measurement equipment

(VNA, spectrum analyzer, signal generator, power meters) Ability to support

antenna tuning,



RF testing and post-processing of measurement data Basic programming or scripting skills ( Python, MATLAB or similar ) Knowledge of plasma systems, EMC/EMI or space hardware is considered a plus Interpersonal Skills

Curious and proactive, with a strong learning mindset Methodical and detail-oriented, especially in experimental and test environments Comfortable collaborating within multidisciplinary engineering teams Clear communicator, able to document and explain technical work Adaptable and resilient in a fast-moving startup context Positive attitude, constructive sense of humor and ability to contribute to a healthy, enjoyable work environment 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 Hands-on access to labs, test campaigns and cutting-edge technology from day one 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

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📌 RF Engineer (Madrid)
🏢 Kreios Space
📍 Madrid