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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This Job is No Longer Active This position is no longer accepting applications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

Build and scale the core AI voice automation platform as a Founding Senior Full-Stack Engineer, shaping backend systems (prompt orchestration, telephony) and frontend experiences (dashboards, analytics). Lead end-to-end projects, collaborate with the founding team, and drive customer-facing features for a high-growth Voice AI startup. Requires 2+ years of full-stack expertise with React, TypeScript, and Node.js, with a proactive, founder-like mindset.

Key Highlights
Founding role shaping a category-leading Voice AI platform for global communication
Full-stack ownership from architecture to production, bridging backend (prompt orchestration, telephony) and frontend (dashboards, analytics)
High-impact, fast-paced environment with rapid feedback loops and significant equity (0.4-0.6%)

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Key Responsibilities
Develop core features like prompt orchestration, dashboards, analytics, and telephony integrations for the AI voice automation platform
Build and maintain scalable full-stack systems, including polished UIs, robust APIs, and DevOps workflows
Lead projects from architecture to production, owning coding, deployment, and iterative improvements
Create intuitive interfaces and APIs to enable customer activation within hours and enhance user experiences
Support customer onboarding, debug issues, and translate feedback into product enhancements
Technical Skills Required
React TypeScript Node.js

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Benefits & Perks
215,000–290,000 USD annual salary (with 3 best-offer cash-equity balance options)
0.4–0.6% equity with high ownership potential (>1M revenue/employee)
100% medical, dental, and vision insurance coverage
Unlimited meals and snacks, gym reimbursement, and daily commute fee coverage
Internet and phone bill coverage
Visa sponsorship for H1B and Green Card
Top 1% talent compensation (above-market, top 5 percentile)

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Nice to Have
Python
Experience with prompt orchestration or telephony integrations
Degree in Computer Science, Computer Engineering, or equivalent practical experience

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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