Retell AI is using the first principles to reimagine the call center with cutting edge voice AI.
Since launching 18 months ago, thousands of companies now utilize Retellâs AI voice agents to handle sales, support, and logistics calls that once required large teams of human agents. Backed by Y Combinator, Alt Capital, and other leading investors, we have scaled to $36M ARR with a team of 20 people, up from $5M at the start of 2025.
Our vision for 2026 is to build a modern CX platform where entire contact centers are powered by AI. Instead of basic automation that needs constant human tuning, weâre creating intelligent AI âworkersâ that can act as frontline agents, QA analysts, and managers â continuously executing, monitoring, and improving customer interactions.
Weâre growing quickly and looking for ambitious builders who want to tackle hard technical problems, move fast, and have real impact at one of the fastest-growing voice AI startups.
Letâs build the future together.
Weâre a top 50 AI app in a16z list: https://tinyurl.com/5853dt2x
#4 on Brex's Fast-Growing Software Vendors of 2025: https://www.brex.com/journal/brex-benchmark-december-2025
We're also one of the top ranking startups on: https://leanaileaderboard.com/
As a Senior Full-Stack Engineer, youâll shape the heart of Retell AIâs voice automation platform, building scalable systems and intuitive interfaces that power millions of AI-driven conversations. Youâll work across the stackâleveraging React, TypeScript, and Node.jsâto deliver fast, beautiful, and reliable solutions. Collaborating closely with the founding team, youâll 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.
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.
Cash: 215k - 290k
Equity: Offers Equity
Location: Redwood City, CA, US
US Visas: Retell AI is open to sponsoring work authorization for qualified candidates, including H1B/H-1B, TN, L-1, E-3, F-1 (OPT/CPT), and O-1 visas.
100% coverage for medical, dental, and vision insurance
$70/day DoorDash credit for unlimited breakfast, lunch, dinner, and snacks
$200/month wellness reimbursement (gym, fitness classes, etc.)
$300/month commuter reimbursement (gas, Caltrain, etc.)
$75/month phone bill reimbursement
$50/month internet reimbursement
Best Offer Upfront: Choose from three cash-equity balance options; no negotiation needed.
Top 1% Talent: Above-market pay (top 5 percentile) to attract exceptional builders.
High Ownership: Small teams, >$1M revenue/employee, and significant equity.
Performance-Based: Offers tied to interview performance, not experience or past salaries.
Online Assessment (1.5 Hours): Coding questions on practical problem-solving (7 days to complete).
Intro Call (15-20min): Connect with our Founding Recruiter to get a deeper look at the team and the work you'd be doing.
Technical Phone Interview (45 min): Practical coding session focused on code fluency and system design (For frontend roles, we will focus on React-specific questions. For backend roles, we take a technology-agnostic approach.)
Technical Interview (45 min): A deep dive into your backend chops and how you think through systems design.
Onsite/Virtual Interviews (2â3 hrs): Hosted in our office if located in the Bay Area or virtual, with three rounds:
Practical Coding: Tackle real-world coding tasks with debugging.
System Design: Architect a production-ready system.
Tools & Automation: Build automations or improve workflows in any basic environment setup like python, java, node.js, etc.
Retell AI - API That Turns Your LLM Into A Human-Like Voice Agent
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Join Retell AI to shape the future of voice automation, building scalable, impactful full-stack systems that redefine AI-driven communication.
Retell AI