{"id":3078723,"url":"https://alion.io/job/ecm-selection-senior-c-software-engineer","title":"Senior C++ Software Engineer","company":{"id":53991,"name":"ECM Selection","domain":"ecmselection.co.uk","url":"https://alion.io/company/ecm-selection","size_band":null,"is_staffing_agency":true,"employer_type":"agency","is_intermediary":false,"listed_via":null,"ats_vendor":"Schema","truth_index":{"grade":"B","score":75,"open_postings":7,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-22T06:10:10Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Cambridge, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":80000,"max":80000,"currency":"GBP","period":"year","gross":null,"usd_annual":107086},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Linux","optional":false},{"name":"Rust","optional":false}],"status":"live","first_seen_at":"2026-10-08T00:00:00Z","employer_posted_date":"2026-10-08","last_verified_at":"2026-10-22T11:27:38Z","board_verified":true,"closed_at":null,"days_open":15,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":15},"description":"We are seeking a Senior C++ Software Engineer, skilled in creating highly-optimised low level code to run under Linux. As a senior member of this Cambridge-based development team, you will play a leading role throughout the SDLC from defining initial requirements to software implementation, verification and deployment.\nYour focus will be on dependability as well as seeking clever optimisations to take best advantage of the underlying hardware. You will interact with colleagues with other technical background such as electronics and FPGA design, as well as the end users of the code you create. Your knowledge will help steer the technical direction of the team and provide mentoring for less experienced colleagues.\nYou will need:\nA solid academic background in computer science, electronics, or a similarly applicable subject.\nExcellent software design and development skills together with the in-depth knowledge of how C++ works under the skin, allowing you to avoid performance pitfalls and create fast, reliable code.\nA good understanding of Linux, as well as areas such as concurrency, network protocols, and CPU architectures.\nExisting coding skills, or a demonstrable interest in Rust.\nGreat team work, communication, and analytical skills.\nFull existing UK work permission.\nA highly competitive package is on offer to the successful candidate, including a performance-based bonus. Joining at an exciting point, this is an excellent chance to join a company that's committed to staying at the technological forefront of what they do, and to nurturing the development of their employees.\nKeywords: C++, High Performance Software, Low-Latency, Networking, Rust, Cambridge\nInterested? Send your CV to ECM Selection. We do read every CV and try to respond to everyone. Or recommend a friend for £250, details at https://ecmselection.co.uk/tell-a-friend.\nPlease note: even if you don't have exactly the background indicated, do contact us now if this type of job is of interest - we may well have similar opportunities that you would be suited to. 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