Founding Engineer

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.