Senior Software Engineer

Spectrum IT Recruitment
Southampton
Today
£60,000 – £65,000 pa

Salary

£60,000 – £65,000 pa

Seniority
Senior
Posted
6 Nov 2026 (Today)

Spectrum IT Recruitment is working with an innovative technology business at the forefront of5G and wireless communications. They're looking for aSenior Software Engineer to join their software team in Southampton.

This role would suit an experienced engineer whose main focus isC or C++ software development, particularly in multithreaded or high-performance systems.

The Role

You'll take a leading role in developing, integrating and optimising software that supports the company's5G NR Physical Layer (PHY) technology. Working with software, hardware, architecture and system-test teams, you'll tackle complex performance challenges and help shape reliable software for a demanding technical environment.

Key Responsibilities

  • Take technical ownership of C/C++ software development used to run and test 5G NR PHY algorithms
  • Drive software performance improvements through optimisation and multithreading
  • Lead the integration of software components and resolution of complex technical issues
  • Develop and maintain automated testing and CI processes
  • Collaborate with hardware, architecture and system-test teams
  • Support interoperability testing with customers, vendors and operators
  • Provide senior technical input into reviews and wider software engineering decisions

What We're Looking For

Essential:

  • Extensive commercial experience developing software inC or C++
  • Strong software engineering fundamentals and sound technical judgement
  • Proven experience withmultithreaded or high-performance software
  • The ability to take ownership of complex performance and optimisation challenges

Desirable:

  • Knowledge of SIMD or hardware acceleration
  • An understanding of signal processing
  • Exposure to 5G, O-RAN or fronthaul protocols such as eCPRI

Spectrum IT Recruitment (South) Limited is acting as an Employment Agency in relation to this vacancy.

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