As a Full-Stack Engineer at Zeno AI, you will build real-time voice AI products, develop full-stack features, and create user-facing experiences. You'll work in a fast-paced environment, iterating based on user feedback and shaping engineering culture.
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
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