Senior Software Engineer

Software Engineers – Wireless PHY (Senior & Principal)

Southampton (Hybrid 2–3 days/week) | £70k–£100k + Bonus + Equity + Sponsorship

Some software jobs are about features.

This one is about performance.

You'll be building and optimising real-time software that sits directly in the physical layer of advanced wireless systems — the part where latency, throughput and correctness actually matter.

What you'll work on

• High-performance C/C++ on x86 or ARM
• Real-time PHY signal-processing implementations
• Optimising hot code paths using SIMD/vectorisation
• High-performance APIs for hardware-accelerated paths (Linux, PCIe, DPDK)
• Collaboration with DSP, FPGA and systems teams
• Software that ships into real 4G/5G and satcom deployments

Who this is for

Engineers with prior experience in wireless Layer-1 / PHY development, such as:

• OFDM/MIMO algorithms
• Channel estimation/equalisation
• LDPC, Polar or turbo coding
• ORAN Split 7.2, FAPI/LLS
• Real-time DSP implementations
• Low-latency C/C++ in hardware-adjacent systems

Senior roles focus on delivery and optimisation;

Principal roles add technical leadership and architectural responsibility.

What's on offer

• £70k–£100k depending on level
• Up to 20% bonus
• Equity
• Visa sponsorship & relocation support
• PMI, healthcare, pension
• Hybrid: 2–3 days/week in the Southampton office

If you want to work on software where every cycle counts — and you already know your way around the PHY layer — let's talk.