
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…

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…
What they do: Enterprise voice-AI platform for building and deploying production-ready AI phone agents
Stage / funding: Seed (announced $4.6M)
Notable backers: Alt Capital (lead) plus angel investors; Y Combinator alumnus
Typical customers / use cases: Call centers and high-volume business calling in healthcare, insurance, finance, logistics
Call-center automation and high-volume business calling
Technology, Information and Internet
$4.6M
Company announced the $4.6M seed round and database profiles list Alt Capital as lead; round included multiple angel investors.
“Y Combinator acceptance; seed lead by Alt Capital and participation from angel investors”
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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.
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.
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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.
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Online Assessment (1 hour): Coding questions on practical problem-solving (7 days to complete).
Intro Call (15-20min): Connect with our talent team to get a deeper look at the team and the work you'd be doing.
First 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)
Technical Phone Interview (45 min): Practical coding session focused on code fluency and focused more heavily on your systems design approach
Onsite/Virtual Interviews (2–3 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.