{"id":1266859,"url":"https://alion.io/job/sixtyfour-senior-software-engineer-infrastructure","title":"Senior Software Engineer - Infrastructure","company":{"id":2027224,"name":"Sixtyfour","domain":"sixtyfour.ai","url":"https://alion.io/company/sixtyfour","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Work at a Startup","truth_index":null},"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":["San Francisco, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":150000,"max":225000,"currency":"USD","period":"year","gross":null,"usd_annual":225000},"salary_estimate":null,"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"Amazon CloudWatch","optional":false},{"name":"Amazon EC2","optional":false},{"name":"AWS","optional":false},{"name":"JavaScript","optional":false},{"name":"Kubernetes","optional":false},{"name":"LLM","optional":false},{"name":"OpenRouter","optional":false},{"name":"Python","optional":false},{"name":"Redis","optional":false},{"name":"Spark","optional":false},{"name":"Stripe","optional":false},{"name":"Next.js","optional":true},{"name":"React.js","optional":true},{"name":"Vercel","optional":true}],"status":"closed","first_seen_at":"2026-09-25T22:38:55Z","employer_posted_date":"2026-09-25","last_verified_at":"2026-09-26T09:44:20Z","board_verified":false,"closed_at":"2026-09-26T09:44:20Z","days_open":0,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":0},"description":"About Sixtyfour\nSixtyfour helps teams understand the people, companies, and entities they interact with. With a primary focus on Compliance (AML/KYB), Trust & Safety, Cybersecurity, and Investigations. Our platform combines agents, LLMs, and large-scale data infrastructure to surface data other platforms can't.\nThe Role\nWe're looking for a Senior Software Engineer to join our core Engineering team and help build the infrastructure Sixtyfour runs on. This is a hands-on, high-ownership role spanning backend systems, API design, billing, and infra scaling. This is the kind of work that shapes not just what we ship, but how we build for years to come. You won't have direct reports, but you'll operate as a technical leader from day one: setting the standards, shaping architecture decisions, and mentoring engineers as the team grows around you.\nIf you're the kind of engineer who gets excited about API design, scaling infrastructure, and payments/billing systems, let’s talk.\nWhat You'll Do\nOwn and evolve core backend infrastructure as we scale usage and traffic\nDesign and build robust, well-architected APIs that power our core product and developer platform\nBuild and maintain billing and payments infrastructure (Stripe)\nBuild and productionize agent workflows and LLM-powered systems\nDrive technical decisions around scaling - performance, reliability, data pipelines, and search\nOperate like an SRE when needed.\nWork hands-on in the codebase daily while mentoring other engineers and helping raise the technical bar across the team\nPartner directly with leadership on technical strategy and roadmap as an early, influential member of the team\nWhat We're Looking For\n3-7 years of professional software engineering experience\nExperience as a team lead or tech lead - comfortable providing technical direction and mentorship without needing direct reports to do so\nStrong API design and backend development experience\nExperience with observability \nExperience with backend infrastructure and scaling systems in production\nExperience building or maintaining billing/payments systems (Stripe or similar)\nProficiency in Python and JavaScript\nExperience with Kubernetes\nExperience with Apache Spark\nExperience with AWS: Glue, EC2, Data Pepper & CloudWatch\nExperience with: Temporal \nExperience with OpenRouter\nExperience with LLMs, scaling infrastructure, and search\nComfortable in a fast-paced, early-stage environment with high ownership and ambiguity\nWilling to be based in or relocate to the San Francisco Bay Area.\nNice to Have\nExperience building developer-facing products or platforms (APIs, SDKs, dev tools)\nExperience with Next.js and Vercel\nPrior startup experience, ideally at a similarly early stage\nExperience working in an AI company\nExperience developing agents\nBenefits\nUnlimited PTO\nLunch on us in the office\nMonthly gym membership reimbursement\nMonthly AI tools/productivity reimbursement\n401k with company match\nHealth / Dental / Vision \nFlexible working hours","description_format":"text","description_chars":2986,"description_truncated":false,"requirements":{"experience_years_min":3,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["401k plan","Flexible schedule","Gym membership","Unlimited PTO"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":true,"industries":["Artificial Intelligence","AI Agents"],"lifecycle":[{"event":"open","at":"2026-09-25T22:38:55Z"},{"event":"close","at":"2026-09-26T09:44:20Z"}],"liveness":null,"pay":{"stated_usd_annual":225000,"is_top_pay":true},"html_url":"https://alion.io/job/sixtyfour-senior-software-engineer-infrastructure","json_url":"https://alion.io/job/sixtyfour-senior-software-engineer-infrastructure.json","meta":{"generated_at":"2026-09-28T04:41:38Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","usage":{"tier":"crawler","counted_by":"address","units_charged":1,"used_today":2999,"day_limit":5000,"remaining_today":2001,"minute_limit":60,"resets_at":"2026-09-29T00:00:00Z"}}}