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This range is provided by dynamism vc. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range

$200,000.00/yr - $280,000.00/yr

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Dynamism.io | investor & hiring exceptional humans for Hypergrowth startups in San Francisco | Y Combinator and McKinsey alum

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.

This is 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

• Modular backend infra optimized for real-time performance

You Might Be a Fit If You…

• Have 5+ years of full-stack or backend experience, including owning systems end-to-end

• Are strong in React + TypeScript and comfortable jumping between frontend and backend

• Have startup experience or thrive in 0→1 environments

• Have operated at a Senior, Staff, or Principal level — even if the title didn’t say it

• Want to work in-person with a sharp, ambitious team in SF

What They’re Looking For

Clear communicator — You explain tradeoffs and decisions crisply

Founder-level drive — You take ownership without waiting for permission

Execution bias — You ship quickly and iterate with users in mind

Mission-aligned — You believe voice-first interfaces are the next wave of computing

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Engineering and Information Technology

• Industries

  Software Development

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