Founding Senior Software Engineer (Full-stack)

Stealth Startup; California (MO); Hybrid; USD 215,000 - 290,000; Full time

Benefits offered by this job

Unlimited meals

Gym reimbursement

Commute reimbursement

Internet and phone bill coverage

Job summary

Stealth Startup is seeking a Founding Senior Full-Stack Engineer to shape the core AI voice automation platform. You will work across the stack with React, TypeScript, and Node.js, building scalable systems and intuitive dashboards that power millions of conversations.

You'll bridge backend architecture with frontend experiences, participate in customer onboarding, and own initiatives from architecture to production in a fast-paced founding team.

Qualifications

• 2+ years of full-stack experience with React, TypeScript, Node.js, or Python.
• Degree in CS, CE, or equivalent practical experience.
• Hybrid work setup in Redwood City, CA; on-site with optional remote days.

Responsibilities

• Develop core features like prompt orchestration and analytics.
• Build scalable full-stack systems with polished UIs and robust APIs.
• Lead projects from architecture to production ownership and iteration.
• Create intuitive interfaces and APIs enabling customers to activate in hours.
• Support customer onboarding, debug issues, and turn feedback into product improvements.

Skills

React

TypeScript

Node.js

Python

Education

CS/CE degree

Job description

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

As a Founding Senior Full-Stack Engineer, you’ll shape the heart of the company AI’s voice automation platform, building scalable systems and intuitive interfaces that power millions of AI-driven conversations. You’ll work across the stack—leveraging React, TypeScript, and Node.js—to deliver fast, beautiful, and reliable solutions. Collaborating closely with the founding team, you’ll bridge backend architecture (like prompt orchestration and telephony integrations) with frontend experiences (such as dashboards and analytics tools), ensuring seamless customer onboarding and impactful user experiences. This high-impact role offers rapid feedback loops, customer collaboration, and the opportunity to define a category-leading product that transforms global communication.

Key Responsibilities

• Develop core features like prompt orchestration, dashboards, analytics, and telephony integrations.
• Build scalable full-stack systems, from polished UIs to robust APIs and DevOps workflows.
• Lead projects from architecture to production, owning coding, deployment, and iteration.
• Create intuitive interfaces and APIs, enabling customers to activate in hours.
• Support customer onboarding, debug issues, and turn feedback into product enhancements.
• Have 2+ years of full-stack experience with React, TypeScript, Node.js, or Python.
• Hold a degree in CS, CE, or equivalent practical experience.
• Take ownership like a founder, proactively solving problems across the stack.
• Thrive in fast-paced settings, quickly adapting to new tools and challenges.
• Communicate clearly, collaborating effectively in small, dynamic teams.
• Job Type: Full-time, 70 hr/week (50 hr/week onsite with flexible hours + 20 hr/week work from home)
• Cash: 215k - 290k
• Equity: 0.4 - 0.6%
• Location: Redwood City, CA, US
• US Visas: Sponsors Visa & Green Card

Other Benefits

• Unlimited breakfast, lunch, dinner, and snacks
• Gym and daily commute fee reimbursement
• Internet and phone bill covered

Compensation Philosophy

• Best Offer Upfront: Choose from three cash-equity balance options, no negotiation needed.
• Top 1% Talent: Above-market pay (top 5 percentile) to attract high performers.
• High Ownership: Small teams, >$1M revenue/employee, and significant equity.
• Performance-Based: Offers tied to interview performance, not experience or past salaries.