Senior Founding Full-Stack Engineer

About the Company Our client is a rapidly scaling, YC-backed Voice AI company. With $5M in seed funding and over $30M in annual recurring revenue — generated by a team of just 20 — they're setting the benchmark for voice automation at scale.

The Role As a Senior Founding Full-Stack Engineer, you'll help build the platform behind millions of AI-powered voice conversations. You'll work across React, TypeScript, and Node.js to develop high-performance systems and polished interfaces that drive seamless customer experiences.

What You'll Do

Build and ship core product features — prompt orchestration, dashboards, analytics, and telephony integrations
Work across the full stack, from clean, responsive UIs to scalable APIs and DevOps pipelines
Take full ownership of projects from system design through production deployment
Design intuitive interfaces that accelerate customer onboarding and activation
Work directly with customers, translating real-world feedback into meaningful product improvements

What We're Looking For

3+ years of professional full-stack experience with React, TypeScript, Node.js, or Python
Currently working deeply with React
BS/MS in Computer Science, Computer Engineering, or equivalent hands-on experience
Self-starter mentality — you identify problems and solve them without waiting to be asked
Comfortable operating in a high-pace, high-output environment
Clear communicator who collaborates well across functions

Compensation & Benefits

Base Salary: $200K–$280K USD
Schedule: Full-time, 60~70 hrs/week (50 onsite + 10-20 remote, flexible hours)
Location: San Francisco Bay Area (5 days onsite)
100% coverage for medical, dental, and vision
Cellphone and internet reimbursement
Unlimited meals and snacks on-site
Gym and commute reimbursement
Visa sponsorship available (H-1B, TN, L-1, E-3, F-1, O-1)

Interview Process

Online coding assessment (25–30 min)
Technical phone interviews (2 rounds)
Onsite/virtual final round: live coding, system design, and automation

Syndesus, Inc.

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