X4 Technology
Principal RF Systems Engineer
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Principal RF Systems Engineer
Principal RF Systems Engineer | Advanced Wireless Test & Measurement
We’re a specialist engineering team developing next-generation RF analysis and measurement platforms used to design, validate, and characterise cutting-edge wireless systems.
Our work sits at the intersection of RF hardware, digital design, FPGA engineering, embedded systems, and signal processing — building sophisticated instrumentation from first principles rather than iterating on existing tools.
We’re looking for a Principal RF Systems Engineer to take a leading role in shaping the architecture of new wireless test platforms. This is a hands-on technical leadership position with broad scope across system design, implementation, and validation.
đź“Ť Hybrid (UK-based, Cambridge area) | Flexible working with in-office collaboration required
What you’ll be doing
- Defining RF and mixed-signal system architectures for new measurement and analysis platforms
- Designing high-performance RF and digital hardware systems operating at GHz frequencies
- Contributing across FPGA, DSP, firmware, or embedded software development where needed
- Leading prototype bring-up, debugging, and system-level validation
- Developing calibration and characterisation approaches for RF performance
- Working closely with cross-disciplinary engineers across RF, digital, software, and signal processing domains
- Providing technical leadership and mentoring within the engineering team
- Driving innovation in wireless test and measurement technology
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What we’re looking for
- Degree in Electronic Engineering, Physics, or a related technical discipline
- Strong background in RF electronics and wireless system design
- Experience specifying and delivering complex RF systems
- Hands-on RF circuit design experience at 2.4GHz or 5GHz - 7GHz frequencies
- Running tests including writing and executing scripts (in python for example).
- Strong understanding of RF metrics (noise figure, linearity, dynamic range, phase noise, etc.)
- Confident using lab equipment (spectrum analysers, VNAs, signal generators, oscilloscopes)
- Experience debugging and characterising high-frequency PCB designs (Altium preferred), including high density board design
- Ability to operate as both a hands-on engineer and technical decision-maker
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Nice to have
- FPGA development experience (e.g. Xilinx toolchains, Verilog/SystemVerilog/VHDL)
- DSP or communications/modem implementation experience
- Python scripting for automation or test
- Wireless protocols (e.g. short-range or cellular PHY experience)
- Antenna and RF front-end design
- High-speed digital interfaces (USB3, PCIe, etc.)
- Embedded C/C++ development
- PCB layout / signal integrity awareness
About the role
This is a rare opportunity to work at deep implementation level on advanced wireless instrumentation systems. You’ll help shape architecture and product direction while staying close to the engineering detail — from RF hardware through to digital signal processing and system integration.
The client are paying a high rate, are happy with majority remote working and the position has been QDOS assessed as OUTSIDE IR35.
If you enjoy solving complex, real-world RF and wireless engineering problems and want to influence how next-generation test systems are built, this is a strong fit.
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