Founding Engineer

Job Description

Job Description

Founding Engineer Full Stack (Voice AI)

Location : San Francisco, CA (On-site, 5.5 days / week)

Compensation : $160K $260K + Equity (0.5% 1.5%)

Work Authorization : Visa sponsorship available for exceptional candidates

Experience Level : 3-6 years

Tech Stack : TypeScript, React, Python, Ruby on Rails, PostgreSQL, AWS

About the Role

A high-growth AI startup headquartered in San Francisco is redefining voice-based interactions by building hyper-realistic, AI-powered voice agents for customer support, order intake, and lead qualification. With strong revenue momentum, elite backing from top investors, and millions of calls already handled for major brands, this startup is scaling fast and theyre looking for a Founding Engineer to join the core team.

You'll be working at the bleeding edge of LLMs, voice synthesis, and conversational UX, all while shaping product, infrastructure, and company culture from the ground up.

What You'll Do

Build, deploy, and scale full-stack voice AI applications used by real enterprise customers

Collaborate directly with founders and customers to iterate fast and ship meaningful features

Influence product architecture and technical decisions as an early and critical member of the team

Own significant chunks of the backend, especially around real-time data, speech, and AI model pipelines

Help lay the groundwork for engineering excellence in a fast-moving, high-ownership environment

Ideal Candidate

3-6 years of experience as a full-stack engineer (heavier backend experience is preferred)

Demonstrated success building and shipping products at high-growth startups or technical companies

Practical experience applying AI / LLM technologies or working with voice / NLP-based systems

Comfortable with a lean team, fast feedback loops, and high product ownership

Background in CS or a related technical field

Motivated to work in-person with the team 5.5 days a week (Mon-Fri, 9-7 + Sun, 11-5)

Why This Role Is Unique

Founding team access : Work side-by-side with seasoned operators and visionary investors

Massive impact : Early voice AI product already powering interactions for major enterprises

Real ownership : Equity, autonomy, and full-stack exposure in a hyper-growth trajectory

Zero fluff : A lean team of high-performers, no bloated headcount, just pure execution

If you're hungry to build the future of AI-driven communication and want to work on meaningful systems from day one, this is your launchpad. Let's talk.