Senior Founding Full Stack Engineer | AI Voice Agents
San Francisco, CA | On-site, 5 days a week | $200K–$280K base + equity
Build the future of AI-powered customer conversations
We're partnering with a profitable, venture-backed AI company in the San Francisco Bay Area that's transforming enterprise customer service through advanced, voice-based AI agents.
With a team of fewer than 50 people, the company is building production-ready AI solutions for major U.S. enterprises. This is an opportunity to join a small, high-impact engineering team where your work directly shapes the product, architecture, and technical direction of the business.
The Opportunity
As a Senior Founding Full Stack Engineer, you'll take end-to-end ownership of core product features, from architecture and development to deployment in production.
You'll work directly with the founders to build high-performance applications and the infrastructure powering real-time AI voice interactions. This role is ideal for an engineer who combines strong frontend expertise with solid backend skills and thrives in a fast-paced, early-stage environment.
What you'll do:
- Design and build core features for AI voice agents, including prompt orchestration, real-time dashboards, and analytics platforms.
- Develop high-performance frontend applications using React and TypeScript.
- Build backend services, APIs, and integrations supporting enterprise-scale customer conversations.
- Integrate telephony and real-time communication systems.
- Own the full software development lifecycle, from system design to production deployment.
- Optimize application performance, state management, and real-time data visualization.
- Work directly with founders and enterprise customers to deliver reliable, production-ready solutions.
What We're Looking For
- 3–8 years of professional experience in full-stack software engineering.
- Strong expertise in React and TypeScript, particularly in building performant frontend applications.
- Solid backend engineering experience; programming language is flexible.
- Proven ability to own features end-to-end, including architecture, API development, and deployment.
- A Bachelor's degree in Computer Science or Computer Engineering from a top-tier academic program, with a minimum GPA of 3.8/4.0 or equivalent.
- Willingness and ability to work on-site in San Francisco, five days per week.
Nice to Have
- Experience with voice, telephony, or real-time communication technologies such as Twilio, SIP, or WebRTC.
- Experience building products powered by LLMs or AI agents.
- Experience as an early engineer at a fast-growing startup.
Compensation & Benefits
- $200,000–$280,000 annual base salary
- 0.25%–0.45% equity
- 100% employer-paid medical, dental, and vision insurance.
- $10,000 relocation package.
- Visa sponsorship available for eligible candidates under H-1B, TN, L-1, E-3, and O-1 categories.
- Daily meal allowance and reimbursements for gym, commuting, phone, and internet expenses.
Why Join?
You'll have the opportunity to shape a core AI product, work directly with company founders, and make meaningful technical decisions in a small team where engineering has a direct impact on business outcomes.
If you're a strong full-stack engineer who enjoys building from the ground up and shipping production-grade AI products, we'd love to hear from you.
