
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.
THE ROLE
We’re looking for a Principal/Staff Engineer to help own the technical direction of our core platform. This is a staff-level IC role for someone who thrives in ambiguity, moves fast, and raises the bar for everyone around them.
You’ll work across systems, infrastructure, and product surfaces — partnering closely with engineering, product, and leadership to scale what’s already working and build what’s next.
This is not a “ticket taker” role. You’ll define problems, design solutions, and ship.
Key Responsibilities
YOU MIGHT THRIVE IF
Bonus points if you’ve worked with: distributed systems, Voice AI, real-time systems, APIs at scale, infra/platform work, or developer-facing products.
WHY THIS ROLE
If you want a role where your decisions visibly shape the company, this is it.
JOB DETAILS
Other Benefits
Compensation Philosophy
INTERVIEW PROCESS
Recruiter Screen (15min): Speak with a member of the talent team to learn more about us and which team you would be a good fit for.
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Technical 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): This is a systems design-focused interview. There will be no coding; we want to assess your skills in systems design.
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.