Senior Member of Technical Staff

San Francisco, CA · On-site · Full-time Compensation: $225,000–$300,000 + equity About the Company Our client is a seed-stage, top-tier-investor-backed startup building the simulation, observability, and evaluation layer for Voice AI agents — the infrastructure that lets companies trust and continuously improve their automated voice systems. It was founded by engineers who previously built core infrastructure at two of the largest cloud and AI platforms. Within a year of launching, it has been adopted by household-name enterprises across big tech, banking, healthcare, and food service, and now handles millions of calls a month on seven-figure revenue. Founded 2025 · ~10 people · Industry: Voice AI infrastructure / AI Tools The Role A high-bar, full-ownership engineering role on a small, fast-moving team. You'll architect and build the systems that simulate, analyze, and evaluate conversational AI agents, and design the scalable real-time infrastructure behind millions of live conversations. This is also a customer-facing role — you'll help build, sell, and deploy the product to some of the largest companies in the world. What you’ll be doing Architecting simulation, analysis, and evaluation systems for conversational AI (voice and multimodal) Designing resilient, scalable AWS infrastructure for millions of real-time conversations Building algorithms and pipelines that surface insights, detect failure modes, and keep agents safe and aligned Leading the technical execution of projects end to end Working directly with customers to build and deploy Tech stack: Python, FastAPI, Supabase, Redis, heavy AWS (Lambda, EC2, Websockets, SIP), CI/CD; voice-AI tooling (LiveKit, Deepgram, Cartesia, ElevenLabs, Gemini); observability (Sentry, PostHog, Grafana, Datadog). Requirements At least 6 years of engineering experience at a senior level Deep full-stack proficiency, with real strength in databases, AWS, and AI engineering Hands-on experience with modern voice-AI tooling (e.g. LiveKit, Deepgram) A track record of building high-traffic systems at scale and owning technical execution end to end A standout background — a strong undergraduate degree and/or time at a top fast-growing startup Excellent communication skills and genuine comfort in customer-facing settings Able to work on-site in San Francisco five days a week (approx. 9–7) Nice to Haves Experience handling very large scale as an individual contributor or senior engineer Prior technical-lead experience owning projects end to end Strong design instincts, deep systems intuition, and a highly optimized development workflow A personable, confident communicator who thrives in front of customers Why Join Join a ~10-person team with real traction: millions of calls a month, seven-figure revenue, and marquee enterprise customers within a year of launch Solve hard, real-time engineering problems in the hardest AI modality — voice Full ownership and end-to-end technical leadership on a small, high-caliber team Competitive salary plus equity, health insurance 401(k), free lunch, and a Union Square office Details Location — San Francisco, CA Work policy — On-site, 5 days/week Compensation — $225,000–$300,000 + equity Visa sponsorship — Not available Employment type — Full-time #J-18808-Ljbffr David Joseph & Company