Retell is building the new standard for automating call center communications, including sales, support, customer engagement, and retention calls.

Backed by Altman Capital, Y Combinator, and top investors, we've raised a $4.7M seed round and hit $14M ARR in 15 months.

Check us out on the Top Lean AI Native Companies Leaderboard at leanaileaderboard.com.

Skills: Node.js, React, Software Architecture, Next.js, CSS, HTML

As a Founding Senior Full-Stack Engineer, you’ll shape the heart of Retell 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.

You Might Thrive If You

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 Details

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

100% medical, dental, vision insurance coverage
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.

Interview Process

Online Assessment (25–30 min): One HackerRank coding questions on practical problem-solving (7 days to complete).
Technical Phone Interview 1 (30 min): Live coding on CoderPad, focusing on data structures and algorithms.
Technical Phone Interview 2 (30–45 min): Full-stack development with JavaScript, TypeScript, React, and Node.js in a local environment.
Onsite/Virtual Interviews (2-3 hrs): Hosted in our office if located in the Bay Area or virtual, with three rounds:
1. Practical Coding: Tackle real-world coding tasks with debugging in a local react environment.
2. System Design: Architect a production-ready system.
3. Tools & Automation: Build automations or improve workflows in any basic environment setup like python, java, node.js, etc.

Learn More

Retell AI - API That Turns Your LLM Into A Human-Like Voice Agent

Retell AI Basics: Everything You Need to Start Building Voice Agents

Join Retell AI to shape the future of voice automation, building scalable, impactful full-stack systems that redefine AI-driven communication.