Senior Software Engineer

2 weeks ago


City Of Southampton England, United Kingdom Yoh, A Day & Zimmermann Company Full time £70,000 - £100,000 per year

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.



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