{"id":1769965,"url":"https://alion.io/job/reflexivity-backend-software-engineer-golang-london","title":"Backend Software Engineer, Golang - London","company":{"id":2241328,"name":"Reflexivity","domain":"reflexivity.com","url":"https://alion.io/company/reflexivity-com","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"FirstStage","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":"2026-10-17T05:46:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United 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systems that power Reflexivity’s AI-driven investment platform.\nThis role exists because scale, data complexity, and latency matter deeply in finance.\nYou will work closely with AI and product teams to ship production-grade systems.\nWhat You’ll Be Responsible For\nBuild and maintain Golang services that power core product workflows\nDesign APIs and data pipelines used by AI and reasoning systems\nImprove system performance, reliability, and observability\nReview and challenge designs to keep systems simple and scalable\nDebug production issues with speed and discipline\nWhat “Good” Looks Like in This Role\nAfter 3 months:\nYou ship production code confidently and understand system trade-offs.\nAfter 6 months:\nYou own critical services and improve their performance or reliability.\nAfter 12 months:\nYou influence architecture decisions and mentor other engineers.\nWho You Are (Must-Haves)\n5 plus years backend engineering experience\nStrong Golang experience in production systems\nStartup experience on a core product\nExperience working with data-heavy systems\nComfortable using AI-assisted coding tools daily\nFintech or investment domain exposure\nNice-to-Haves\nExperience supporting ML or LLM systems\nDistributed systems or low-latency data pipelines\nHow We Work\nEngineers own systems end to end\nClear accountability and direct feedback\nIn-office team with high trust and high ownership\nWhy This Role Is Worth Your Time\nWork on systems that directly affect investor outcomes\nStrong technical ownership\nHigh bar engineering culture without bureaucracy\nCompensation & Practicalities\n£80,000 to £160,000 depending on experience\nEquity included\nIn-office role based in London\nNo agencies\n£80,000-£160,000 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