Your mission 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.

Your profile

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

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

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 (Zaragoza)
🏢 Kreios Space
📍 Zaragoza