{"id":827774,"url":"https://alion.io/job/radixark-member-of-technical-staff-backendapi-platform","title":"Member of Technical Staff — Backend/API Platform","company":{"id":686458,"name":"RadixArk","domain":"radixark.com","url":"https://alion.io/company/radixark","size_band":null,"is_staffing_agency":false,"is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"C","score":55,"open_postings":20,"ghost_share":0.75,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-09-24T05:45:00Z"}},"role":"AI/ML","role_family":"AI/ML","seniority":"staff","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Palo Alto, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":200000,"max":400000,"currency":"USD","period":"year","gross":null,"usd_annual":400000},"salary_estimate":null,"experience_years_min":4,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"Datadog","optional":false},{"name":"GCP","optional":false},{"name":"Go","optional":false},{"name":"Grafana","optional":false},{"name":"gRPC","optional":false},{"name":"Kubernetes","optional":false},{"name":"Platform Engineering","optional":false},{"name":"Prometheus","optional":false},{"name":"Python","optional":false},{"name":"Rest API","optional":false},{"name":"Rust","optional":false},{"name":"SGLang","optional":false},{"name":"CI/CD","optional":true},{"name":"GitHub","optional":true},{"name":"LLM","optional":true}],"status":"live","first_seen_at":"2025-12-30T00:45:54Z","employer_posted_date":"2026-09-18","last_verified_at":"2026-09-24T22:45:13Z","board_verified":true,"closed_at":null,"days_open":269,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":268},"description":"About the Role\nRadixArk is looking for a Member of Technical Staff - Backend/API Platform Engineer to build the API layer, control plane, and platform services that power SGLang and Miles in production. You'll design and implement the REST/gRPC APIs, authentication systems, multi-tenancy isolation, and monitoring infrastructure that thousands of developers and companies rely on. This role bridges high-performance inference/training systems with production-grade platform engineering.\nRequirements\n4+ years experience building production backend systems, APIs, or platform infrastructure\n\nBachelor's or Master's degree in Computer Science, Engineering, or equivalent industry experience\n\nStrong proficiency in Python, Go, or Rust with production-quality code standards\n\nExperience designing and building REST/gRPC APIs at scale\n\nSolid understanding of distributed systems, databases, caching, and message queues\n\nExperience with authentication, authorization, rate limiting, and multi-tenancy\n\nFamiliarity with cloud platforms (AWS, GCP, Azure) and Kubernetes\n\nExperience with monitoring and observability tools (Prometheus, Grafana, DataDog)\n\nUnderstanding of ML serving infrastructure or high-throughput systems is a plus\n\nResponsibilities\nDesign and build production APIs for SGLang and Miles: REST/gRPC endpoints, client SDKs, API versioning\n\nImplement authentication, authorization, and rate limiting systems for multi-tenant deployments\n\nBuild control plane infrastructure: job scheduling, resource allocation, model deployment management\n\nCreate monitoring, logging, and observability systems for production inference and training workloads\n\nDesign and implement billing integration, usage tracking, and quota management\n\nBuild management dashboards and admin tools for cluster operations\n\nEnsure API reliability, performance, and security at scale\n\nImplement multi-tenancy isolation and security boundaries\n\nCreate deployment automation, CI/CD pipelines, and rollback procedures\n\nWrite comprehensive API documentation and integration guides\n\nPartner with Systems Engineers to optimize end-to-end latency from API → serving layer\n\nDebug production issues and implement reliability improvements\nAbout RadixArk\nRadixArk is an infrastructure-first company built by engineers who've shipped production AI systems, created SGLang (30K+ GitHub stars, the fastest open LLM serving engine), and developed Miles (our large-scale RL framework). Founded by AI infrastructure veterans from xAI and NVIDIA, we're on a mission to democratize frontier-level AI infrastructure by building world-class open systems for inference and training. Our team has optimized kernels serving billions of tokens daily, designed distributed training systems coordinating 10,000+ GPUs, and contributed to infrastructure that powers leading AI companies and research labs.\nCompensation\nDepending on background, skills, and experience, the expected annual salary range for this position is $200,000 - $400,000 USD + equity.\nEqual Opportunity\nRadixArk is an Equal Opportunity Employer and is proud to offer equal employment opportunity to everyone regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, veteran status, and more.","description_format":"text","description_chars":3302,"description_truncated":false,"requirements":{"experience_years_min":4,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":["Equity"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["AI Infrastructure"],"lifecycle":[{"event":"open","at":"2026-09-12T15:26:28Z"}],"liveness":{"score":8,"band":"cold","label":"Long shot","p_open":1,"p_active":0.27,"p_room":0.28,"age_days":268,"expected_fill_days":31,"reasons":["conf:1","stale_co","ghost","win:tail","crowd:"],"computed_at":"2026-09-24T05:45:00Z"},"pay":{"stated_usd_annual":400000,"is_top_pay":true},"html_url":"https://alion.io/job/radixark-member-of-technical-staff-backendapi-platform","json_url":"https://alion.io/job/radixark-member-of-technical-staff-backendapi-platform.json","meta":{"generated_at":"2026-09-25T02:22:58Z","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":2543,"day_limit":5000,"remaining_today":2457,"minute_limit":60,"resets_at":"2026-09-26T00:00:00Z"}}}