Senior Software Engineer

Founding Senior Software Engineer – Full Stack

Full-Time | San Francisco | In-Person

We’ve partnered with the founder of a fast‑scaling voice AI startup to help hire a Founding Senior Engineer to own core product and infrastructure and shape engineering culture from day one.

This company is building the “Retool for Voice” — a developer platform that makes it simple to build and deploy voice interfaces across SaaS, logistics, telehealth, and more. With Apple and Google introducing human‑like voice assistants to billions of users, this team is building the missing layer between raw LLMs and production‑ready voice apps. They launched in March, have grown revenue quickly, and already serve paying customers.

It’s a ground‑floor opportunity to build foundational full‑stack systems in a real‑time, low‑latency environment—working directly with founders and early users, and playing a lead role in setting product and engineering direction.

What You’ll Do

• Own end-to-end feature development—from customer request to production
• Build modular, API‑first systems that integrate real‑time voice capabilities
• Improve latency, reliability, and UX in critical product flows
• Contribute across the stack—from backend infra to frontend UX
• Help define technical architecture and build the culture you want to work in
• Build modular backend infra optimized for real‑time performance

You Might Be a Fit If You…

What They’re Looking For

Benefits

Seniority Level

Mid‑Senior level

Employment Type

Full-time

Job Function

Engineering and Information Technology

Industries

Software Development

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