Sr Founding Full Stack SWE

Senior Founding Full-Stack Engineer
About the Company
Our client is a fast-growing Y Combinator-backed Voice AI startup transforming sales, support, and customer engagement. With $5M in seed funding and approaching $30M ARR already, achieved with just 20 people, they're building the standard for voice automation at scale.
The Role
As a Founding Senior Full-Stack Engineer, you'll build the core platform powering millions of AI-driven conversations. Working with React, TypeScript, and Node.js, you'll create scalable systems and intuitive interfaces that enable seamless customer experiences.
Key Responsibilities
Develop core features including prompt orchestration, dashboards, analytics, and telephony integrations
Build full-stack systems from polished UIs to robust APIs and DevOps workflows
Own projects end-to-end from architecture to production deployment
Create intuitive interfaces enabling rapid customer activation
Support customer onboarding and translate feedback into product improvements
Requirements
2+ years full-stack experience with React, TypeScript, Node.js, or Python
CS/CE degree or equivalent practical experience
Ownership mindset with ability to solve problems independently
Thrives in fast-paced, dynamic environments
Strong communication and collaboration skills
Compensation & Benefits
Salary:
$200K - $280k USD
Equity:
0.25% - 0.45%
Schedule:
Full-time, 70 hrs/week (50 onsite + 20 remote, flexible hours)
Location:
Redwood City, CA
100% medical, dental, vision coverage
Unlimited meals and snacks
Gym and commute reimbursement
Visa sponsorship available (H1B, TN, L-1, E-3, F-1, O-1)
Interview Process
Online coding assessment (25-30 min)
Technical phone interviews (2 rounds)
Onsite/virtual interviews: practical coding, system design, and automation