Retell AI

Retell is the #1 voice AI agent platform, enabling you to build, test, deploy, and monitor voice AI agents. Industries such as healthcare, insurance, financial services, and logistics use Retell to automate and enhance call operations.

retellai.com

Retell AI

retellai.com

HQUS

Team Size94

Open Jobs19

Total Funding-

Latest FundraiseUnknown

TL;DR

What they do: Voice-first conversational AI platform to build, deploy, and monitor AI voice agents that automate inbound and outbound phone calls.

Stage & funding: Seed-stage; $4.6M seed round (lead: Alt Capital).

Founding & HQ: Founded 2023; co-founder & CEO Bin Wu; based in San Francisco, CA.

Enterprise features: Telephony integrations (SIP trunking), low-latency LLM + speech models, and enterprise compliance claims (HIPAA, SOC 2 Type II, GDPR).

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Company Overview

Problem Domain

Call center and phone-based customer workflows (inbound/outbound calls, customer service, appointment scheduling, call operations automation).

Founded

2023

Industry

Technology, Information and Internet

Tech Stack

Large language models (LLMs)

Speech models (ASR/TTS)

SIP trunking / telephony connectivity

Function calling / LLM orchestration

Knowledge base / RAG

Low-code tooling

Support for custom / open models

Enterprise compliance frameworks (HIPAA, SOC 2 Type II, GDPR)

Funding Track Record

Pre-Seed- Nov 1, 2023

Seed- Apr 3, 2024

$4.6M

Round included participation from Y Combinator, Carya Venture Partners, and 20+ founders/executives/operators; named participants include Jack Altman, Aaron Levie, Siqi Chen, Michael Seibel, and Peer Richelsen.

Investor Signal

“Seed round led by Alt Capital with participation from Y Combinator, Carya Venture Partners, and multiple founders/executives (including named angels and operators).”

Founders

What we do

Join the Team

Senior Software Engineer, Frontend

On-SiteSan Francisco Bay Area, US

On-Site • San Francisco Bay Area, US

About Retell Ai 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 Retell’s 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.

In 2026, We are expanding our vision to build a CX platform of the AI era where the entire contact center is reimagined as a team of AI employees. We are moving beyond mechanical automation that relies on human finetuning to instead transform core functions into intelligent, opinionated AI roles. Frontline agents, QA analysts, and managers now operate as distinct digital workers that serve as the new interface for customer experience. They execute, monitor, and improve continuously to create a system where software behaves like an organization.

We’re scaling fast, and we’re looking for bold, ambitious people to help us build the gold standard for voice automation. If you want to work on deeply technical challenges, move fast, and make an outsized impact at one of the fastest-growing Voice AI startups in the world, you’ll love it here.

Let’s build the future together.

We’re 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/

About The Role As a Frontend Engineer at Retell AI, you’ll build the user experiences that power our voice automation platform—from prompt management and dashboards to analytics and customer-facing tools. You’ll design and ship intuitive, responsive interfaces using React and TypeScript, working closely with backend and DevOps partners to ensure everything is fast, reliable, and scalable.

You’ll own frontend projects end to end, collaborate directly with customers to onboard and debug real-world use cases, and turn feedback into meaningful UX improvements. This is a hands-on, high-impact role where you’ll move quickly, take ownership, and help shape a product used in production by teams building with voice AI.

Key Responsibilities

Design and build core UI features like prompt management, dashboards, and analytics tools.
Develop responsive, intuitive interfaces using React, TypeScript, HTML, CSS, and JavaScript.
Collaborate on backend APIs and DevOps to ensure seamless, scalable systems.
Lead frontend projects from concept to launch, owning architecture, coding, and iteration.
Work with customers to onboard, debug, and turn feedback into UX improvements.

YOU MIGHT THRIVE IF

Have 2+ years of experience building production-grade apps with React and TypeScript.
Hold a degree in CS, CE, or equivalent practical experience.
Take ownership like a founder, proactively solving problems with clean design thinking.
Thrive in fast-paced environments, quickly learning new tools and frameworks.
Collaborate effectively, balancing clarity and momentum in small, dynamic teams.

JOB DETAILS

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 H-1B, TN, L-1, E-3, F-1 (OPT/CPT), and O-1 visas.

Other Benefits

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

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 exceptional builders.
High Ownership: Small teams, >$1M revenue/employee, and significant equity.
Performance-Based: Offers tied to interview performance, not experience or past salaries.

INTERVIEW PROCESS

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 craft the future of voice automation, building intuitive, impactful frontend experiences that redefine AI-driven communication.

Retell AI

Retell AI

TL;DR

Related Companies

Company Overview

Problem Domain

Founded

Industry

Tech Stack

Funding Track Record

Investor Signal

Founders

What we do

Join the Team

Senior Software Engineer, Frontend

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