Staff Infrastructure Engineer at Vapi (W21) $150K - $300K Voice AI for developers. San Francisco Full-time Will sponsor 6+ years About Vapi Voice AI for developers About the role Skills: Go, Kubernetes, TypeScript, Distributed Systems, PostgreSQL About Vapi Vapi is building the future of voice‑native applications. Our platform equips companies with everything they need—telephony, real‑time streaming, deterministic fallbacks, HIPAA/SOC2 compliance, and an AI testing suite—to launch production‑grade voice agents fast. In just 18 months, more than 150,000 developers have signed up, with over 1,000 new developers joining every day. Our mission is to make voice humanity’s default interface again by capturing nuance, emotion, and context that text alone misses. Try it now! About the Role The Founding Senior Engineer (Infra) will be responsible for scaling Vapi’s real-time conversational infrastructure to millions of concurrent calls, while ensuring every call gets picked up within 1s with 99.9% reliability. You’ll also be a foundational part of how we build the culture at Vapi. What You'll Do Own scalability projects end-to-end Build monitoring Build anti-frangibility into the infrastructure Who You Are Experience with Kubernetes, Pulumi, or scaling other distributed systems Communication: You can clearly articulate what you’re thinking and feeling Cracked-ness: You’re more cracked than the most cracked person on the team Startup Ready: You have a reason to be here and can make sacrifices for something uncertain Founder Juice: New ideas come from you, you build it yourself or annoy everyone until it’s done ;) Previous Founding/Infrastructure/DevOps Engineer 1+ year of experience with a seed or Series A company 3+ years of experience in Infrastructure 8+ years experience in Engineering Additional Skills JavaScript , Kubernetes, Node.js, Rust, TypeScript, Distributed Systems Why Vapi Define the future of human–AI interaction: help pioneer a new era of voice-based AI products that are transforming how people and businesses communicate Own meaningful work at a breakout startup: join early, take real ownership, and have a direct hand in building a category-defining company from the ground up Surround yourself with exceptional people: work alongside a world-class team of engineers, operators, and builders backed by top-tier investors who believe in our mission Accelerate your career in a high-growth environment: grow fast, take on big challenges, and unlock opportunities as we scale one of the most exciting platforms in AI What We Offer Competitive compensation : includes a strong base salary and meaningful equity ownership Comprehensive health coverage : medical, dental, and vision plans Flexible time off : take-what-you-need vacation policy with an emphasis on rest and balance Daily meals : catered lunches and dinners provided for in-office days Lifestyle & wellness stipends : monthly allowances to support rent, transportation, food, fitness, and mental well-being Professional development : annual learning stipends for courses, conferences, and upskilling Team connection : regular offsites, team events, and opportunities to build in-person relationships