Senior C/C++ Engineer for 5G NR PHY & Multithreaded Perf

Spectrum IT Recruitment; Southampton; On-site; GBP 70,000 - 95,000; Full time

Job summary

Spectrum IT Recruitment is seeking a Senior Software Engineer to join their Southampton software team, focusing on C/C++ development for high‑performance 5G NR PHY software. The role requires taking technical ownership of performance challenges and delivering reliable software in collaboration with hardware, architecture and system-test teams.

You will drive optimisation, multithreading, and automated testing within a demanding technical environment, while supporting interoperability testing

Qualifications

• Extensive commercial experience developing software in C or C++.
• Strong software engineering fundamentals and sound technical judgement.
• Proven experience with multithreaded or high‑performance software.
• Ability to take ownership of complex performance and optimisation challenges.

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.

Skills

C/C++

Multithreaded software

High‑performance software

Ownership of performance

Job description

Spectrum IT Recruitment is seeking a Senior Software Engineer to join their Southampton software team, focusing on C/C++ development for high‑performance 5G NR PHY software. The role requires taking technical ownership of performance challenges and delivering reliable software in collaboration with hardware, architecture and system-test teams.

You will drive optimisation, multithreading, and automated testing within a demanding technical environment, while supporting interoperability testing