RF Engineer

PaiDefence is a British-Ukrainian DefenseTech company building air defence systems already deployed on the frontlines. We push real technology to the battlefield — not demos, not paper specs.

Our core value is impact for Ukraine: we build technology that makes a real difference where it matters most. We operate with a deep-tech mindset, pushing engineering rigour into every product we ship. We value ownership and responsibility — people who execute, deliver, and stand behind their results.

We are looking for an RF Engineer to join our hardware team and work on the radio frequency subsystems of our detection and countermeasure products. You will work directly with signals, hardware, and real measurement data — not simulations.

Responsibilities

• Analysis and improvement of RF signal paths in direction-finding and detection systems
• Component selection, datasheet review, BOM compilation, manufacturing/assembly requirements
• RF measurements and prototype testing: S-parameters, VSWR, insertion loss, linearity, spurious/harmonics
• Troubleshooting RF system issues: impedance mismatch, nonlinearity, losses, EMI/EMC, stability
• Design optimization for efficiency, size reduction, cost, and power consumption
• Preparation of technical reports, documentation, and specifications

Requirements

• Hands-on experience designing RF systems
• Deep understanding of transmission lines, wave propagation, S-parameters, impedance matching, active and passive RF components
• Practical experience with RF circuit design
• Hands-on experience with SDR (Software-Defined Radio)
• Proficiency with lab equipment: VNA, spectrum analyzer, oscilloscope
• Skills in diagnosing and resolving RF performance issues: EMI/EMC, instability, self-oscillation, spec non-compliance
• English — reading technical documentation

What We Offer

• Real impact — your work goes directly into systems protecting Ukrainian forces on the frontline
• Work within a senior engineering team — direct, senior-to-senior communication with minimal overhead
• Hands-on deep-tech environment with actual hardware, real signals, and real field feedback
• High ownership — direct influence on technical decisions and product direction
• Office in central Kyiv, 3 min from the metro
• Full-time, standard business hours