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, en

📌 RF Engineer (Madrid)
🏢 Kreios Space
📍 Madrid