Full-Stack Engineer

About Zeno AI Zeno AI helps people rehearse high-stakes conversations before they happen. We launched in May 2026 with a voice-based AI interviewer that runs realistic mock interviews, scores candidates with recruiter-grade rigor, and gives concrete coaching tied to specific moments in the conversation. Today, over 200 candidates and a handful of companies use Zeno. We're starting with interview prep, but the broader vision is to help people prepare for any high-stakes conversation: sales pitches, fundraising calls, negotiations, performance reviews, podcasts, panels, and more. About the Role We're hiring a Founding Engineer to help build the core product and infrastructure behind Zeno. You'll work across the stack on voice AI, real-time conversation flows, user-facing product experiences, evaluation systems, and internal tools. This is a high-ownership role for someone who wants to move fast, ship product, and help shape the technical direction of an early-stage AI company. You should be comfortable building quickly, making product-minded engineering decisions, and working with ambiguity. We care less about perfect credentials and more about whether you can ship useful product fast. What You'll Do Build and improve Zeno's real-time voice interview experience Develop full-stack features across the frontend, backend, and AI workflows Integrate LLMs, speech-to-text, text-to-speech, and voice agent infrastructure Improve interview generation, scoring, feedback, and personalization systems Build resume and job-posting ingestion flows Create dashboards, admin tools, and analytics for user sessions and performance Work directly with founders to turn user feedback into shipped product Own features end-to-end, from idea to implementation to iteration Help define engineering culture, architecture, and product velocity What We're Looking For Strong full-stack engineering ability Experience building and shipping real products, side projects, or startup projects Comfortable working with JavaScript/TypeScript, React/Next.js, Node.js, Python, or similar tools Familiarity with LLM APIs, voice AI, agents, or AI product workflows Ability to move quickly without overengineering Strong product sense and willingness to talk to users Clear communication and comfort working in a small, fast-moving team Self-starter mindset with high ownership and low ego Nice to Have Experience with real-time audio, WebRTC, streaming, or voice agents Experience with OpenAI, Anthropic, ElevenLabs, Deepgram, LiveKit, Vapi, Retell, or similar tools Experience building AI evals, scoring systems, or feedback loops Experience with Supabase, Postgres, Firebase, or similar backend platforms Experience deploying production apps on Vercel, AWS, GCP, Azure, or similar platforms Interest in recruiting, career development, sales enablement, or communication coaching Previous startup or founder experience Logistics Full-time preferred, but open to exceptional part-time candidates Remote OK NYC or SF preferred, but not required Early-stage role with meaningful equity Compensation depends on experience and commitment level