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Founding Senior Full-Stack Engineer (Voice AI Platform)

Stealth Startup • United States
Visa Sponsorship
This Job is No Longer Active This position is no longer accepting applications
AI Summary

Shape the core AI voice automation platform as a Founding Senior Full-Stack Engineer, building scalable systems and intuitive interfaces for global communication. Lead full-stack development (React, TypeScript, Node.js) and collaborate with the founding team to define a category-leading product. Own projects from architecture to production, ensuring seamless customer onboarding and impactful user experiences.

Key Highlights
Founding role shaping a category-leading Voice AI platform with $14M ARR and rapid growth
Full-stack ownership from prompt orchestration to telephony integrations and dashboards
High ownership with $1M+ revenue per employee, significant equity, and top 1% compensation

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Key Responsibilities
Develop core features like prompt orchestration, dashboards, analytics, and telephony integrations
Build scalable full-stack systems, including polished UIs, robust APIs, and DevOps workflows
Lead projects from architecture to production, owning coding, deployment, and iteration
Technical Skills Required
React TypeScript Node.js

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Benefits & Perks
215,000–290,000 USD annual salary (with 0.4–0.6% equity options)
100% medical, dental, and vision insurance coverage
Visa and Green Card sponsorship
Unlimited meals and snacks, gym reimbursement, and commute fee coverage
Internet and phone bill coverage

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Nice to Have
Python
Prompt orchestration experience
Customer onboarding and debugging expertise

Job Description

Job location: San Carlos, CA (on-site)

About

We're not just automating calls—we’re transforming how the world communicates. Our AI voice agents are reshaping sales, support, and customer engagement for leading brands. Backed by Alt Capital, Y Combinator, and top-tier investors, we've raised $4.7M in seed funding and hit $14M ARR with just 12 people.

We’re one of the fastest-growing Voice AI startups and we're on a mission to become the standard for voice automation at scale.

About the Role

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Job Overview
Posted Sep 02, 2026
Employment Full-time
Experience Mid-Senior level
Location United States
Category Programming
Company Stealth Startup
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