Founding Engineer

About this role

ABOUT THE ROLE This is a founding engineering seat on a small, fast-moving team building multi-modal AI agents across voice, SMS, and email for the sports technology and sales automation space. You will own one of four core domains end-to-end, from architecture through daily production shipments, and make product decisions directly alongside customers with no PM layer. WHAT YOU'LL DO - Own an entire domain end-to-end, covering architecture, feature development, and production operations.

- Join customer calls, synthesize feedback, and drive product decisions independently. - Build and optimize multi-modal agents targeting sub-500ms voice latency, high SMS response rates, and long-running conversation state across channels. - Define the quality bar for non-deterministic systems, including evals, prompt versioning, guardrails, and drift detection. - Work full-stack across React/Next.js frontends, Node.js backends, and Python voice services.

WHAT WE'RE LOOKING FOR - 3 to 8 years of full-stack engineering experience with a track record of shipping 0-to-1 products at high-growth startups, as a founder, or on new-vertical teams at large tech companies. - Production proficiency in TypeScript with hands-on experience in Node.js and React/Next.js; this is a hard requirement. - Demonstrated production experience with LLM APIs or agent SDKs (such as Anthropic, OpenAI, Vercel AI SDK, or Mastra), not just tutorials or prototypes.

- Depth in at least one area: production voice or SMS agents, long-running agent state and memory, B2B2C or marketplace product architecture, or agent evals and guardrails. - Comfort making independent product decisions and conducting customer discovery without a dedicated product manager. - Ability to thrive in an ambiguous, early-stage environment and define processes rather than follow them. - Python experience with real-time voice pipelines (e.g., LiveKit, Deepgram, STT/TTS) or evaluation tooling is a strong bonus.

- Founder experience with verifiable traction (revenue, funding, or acquisition) or strong CS fundamentals are both valued paths. - No visa sponsorship available; must be authorized to work in the US. COMPENSATION & BENEFITS Salary range: $180,000 to $250,000 USD annually, plus equity. No visa sponsorship is available. LOCATION On-site, five days per week in Chelsea, New York City. Remote work is not available for this role.