Founding Engineer
About the Role
This is a founding engineering seat at a fast-growing AI-native startup building multi-modal sales agents across voice, SMS, and email for a focused vertical market. You will own one of four core domains end-to-end, making product and architecture decisions directly alongside customers, with no PM layer between you and the work.
What You'll Do
Own an entire product domain from architecture through daily production shipping, covering areas such as B2B product, agent quality, family graph infrastructure, or B2C consumer product.
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 persistent conversation state across channels.
Design and maintain quality systems for non-deterministic AI behavior, including evals, prompt versioning, guardrails, and drift detection.
Work full-stack across React/Next.js frontends, Node.js backends, and Python voice and real-time services.
What We're Looking For
3 to 8 years of full-stack engineering experience, with a strong track record of shipping 0-to-1 p
