Retell Tech Stack

Voice AI agent platform for enterprise call automation

Technology, Information and Internet Redwood City, California 51–200 employees Founded 2023 Privately Held

Retell builds a voice AI agent platform purpose-built for high-volume, regulated industries—healthcare, insurance, financial services, logistics. The stack is modern and distributed (React, Node.js, Python, Kubernetes, Docker on AWS/Azure/GCP), built to handle real-time audio and millions of concurrent phone conversations. Engineering dominates the hiring mix (14 of 24 open roles), reflecting the hard technical problems Retell is solving: real-time reliability, compliance-grade releases, and scaling inbound pipeline while reducing reliance on manual finetuning.

Tech Stack 36 technologies

Core StackReact TypeScript Node.js Python JavaScript Kubernetes Docker Helm Terraform AWS DocuSign PyTorch HubSpot Cursor Figma Storybook Twilio Azure GCP JavaScript/TypeScript Apollo Clearbit Perplexity Five9 Avaya Genesys Amazon Connect Telnyx Wireshark Asterisk+6 more

What Retell Is Building

◆Challenges

Manual error-prone processes
Replacing human agents with ai
Scaling fast
Reliance on human finetuning
Hard technical problems
Scaling inbound pipeline
Real-time audio
Reliable releases that meet compliance requirements
Resilience cost performance improvements
Handling millions of real-time phone conversations

▲Active Projects

Hr & recruiting automation
Security & compliance tooling
Co-sell partnership program
Prompt orchestration
Core business automations
Telephony integrations
Voice agent behavior
Ui component library
End-to-end delivery of voice ai projects
Full-stack integrations with enterprise tools

Hiring Activity

Accelerating25 roles · 15 in 30d

Department

Engineering

Marketing

Product

Partnerships

Research

Sales

Support

Seniority

Senior

Lead

Manager

Junior

Mid

Staff

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About Retell

Retell operates a voice AI agent platform enabling enterprises to build, test, deploy, and monitor AI-driven call automation. The product targets industries with high call volumes and strict compliance requirements: healthcare, insurance, financial services, and logistics. The platform integrates with major telephony providers (Twilio, Telnyx, Amazon Connect, Five9, Avaya, Genesys) and enterprise tools (HubSpot, DocuSign), positioning Retell as infrastructure for call-center modernization. Founded in 2023 and based in Redwood City, the company operates at 51–200 employees with active hiring across engineering and go-to-market functions, including a co-sell partnership program currently in development.

HeadquartersRedwood City, California

Company Size51–200 employees

Founded2023

Hiring MarketsUnited States, Ukraine

Frequently Asked Questions

What tech stack does Retell use?

Retell runs React and TypeScript on the frontend, Node.js and Python on backend, with Kubernetes and Docker for orchestration. Infrastructure spans AWS, Azure, and GCP. Telephony integrations include Twilio, Telnyx, Amazon Connect, Five9, Avaya, and Genesys.

What industries does Retell serve?

Retell targets healthcare, insurance, financial services, and logistics—sectors with high call volumes and compliance requirements. The platform automates and enhances call operations for these use cases.

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How this profile is built

Retell's technology stack, projects, and hiring signals are inferred from public hiring and company data — career pages, public listings, and company web presence — then clustered and de-duplicated. Figures are estimates that refresh over time. Read our full methodology →

This is not an official vendor or customer list. It is a technology-adoption signal inferred from public data, intended for B2B research.