---
title: 'Senior Software Engineer, Full Stack at Retell AI'
canonical: 'https://feeny.ai/job/senior-software-engineer-full-stack-retell-ai-san-francisco-f2w6r59b6xft'
type: 'job'
last_seen: '2026-09-10'
---

# Senior Software Engineer, Full Stack at Retell AI

- **Company:** Retell AI
- **Location:** San Francisco, CA
- **Compensation:** $200k–$300k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2025-10-06
- **Last confirmed live:** 2026-09-10
- **Apply:** https://jobs.ashbyhq.com/retell-ai/dc995420-9909-4867-83f4-0816fe758a6f/application

**Skills:** React, TypeScript, Node.js, Python, Full-stack development, API development, System design

> Build scalable full-stack systems and intuitive interfaces for Retell AI's voice automation platform using React, TypeScript, and Node.js. The role involves developing prompt orchestration, dashboards, and telephony integrations while collaborating with the founding team to deliver fast, reliable solutions.

## Job description

## ABOUT RETELL AI

Retell AI is using first-principles thinking to reimagine the call center with cutting-edge voice AI. Thousands of companies now use 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've scaled to $80M in ARR with a team of 50, up from $5M at the start of 2025, and are now valued at over $1.5B. 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, we're creating intelligent AI “workers” that act as frontline agents, QA analysts, and managers, continuously executing, monitoring, and improving every customer interaction. We're growing fast and looking for ambitious builders who want to tackle hard technical problems, move quickly, and have a real impact on one of the fastest-growing voice AI companies in the world. Let's build the future together. Recent recognition:

- [No. 1 Best Places to Work in the Bay Area, San Francisco Business Times 2026](https://finance.yahoo.com/technology/ai/articles/voice-ai-startup-retell-ai-145200025.html)
- https://a16z.com/the-ai-application-spending-report-where-startup-dollars-really-go/
- [#3 Fastest-Growing Software Company, G2 Best Software Awards 2026](https://company.g2.com/news/g2s-2026-best-software-awards)
- [Best Agentic AI Software, G2 Best Software Awards 2026](https://www.retellai.com/blog/retell-ai-recognized-as-the-best-agentic-ai-software-by-g2)
- [#4 Fastest-Growing Software Vendor, Brex Benchmark 2025](https://www.brex.com/journal/brex-benchmark-december-2025)
- [Enterprise Tech 30 Class of 2026, Nasdaq & Wing VC](https://www.nasdaq.com/videos/retell-ai)
- [Top-Ranked Startup, Lean AI Leaderboard](https://leanaileaderboard.com/)
- [Backed by Y Combinator](https://www.ycombinator.com/companies/retell-ai)

## ABOUT THE ROLE

Retell AI transforms customer experience with voice AI for enterprises, including customers like CVS/Aetna, American Airlines, Lenovo, and Grab. We have more customer stories than we can tell! As a Senior Full-Stack Engineer, you’ll shape the heart of Retell AI’s voice automation platform, building scalable systems and intuitive interfaces that power millions of AI-driven conversations. You’ll work across the stack, leveraging React, TypeScript, and Node.js, to deliver fast, beautiful, and reliable solutions. Collaborating closely with the founding team, you’ll 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.

## KEY RESPONSIBILITIES

- 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.

## YOU MIGHT THRIVE IF

- 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.

## JOB DETAILS

- Cash: 200k - 300k
- Equity: Offers Meaningful Equity
- Location: Redwood City, CA, US (100% Relocation Provided)
- 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.

## 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

- 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 Interview (60 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 system design-focused interview assesses your knowledge of building product-ready systems.
- 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.
- Existing codebase

## About Retell AI

## Company Overview
- **One-liner**: Retell AI is a real-time conversational AI platform that builds human-like, low-latency voice agents to automate phone calls for businesses.
- **Entity Type**: Private (Seed stage, Y Combinator-backed)
- **Headquarters**: San Carlos, California, United States
- **Founded**: 2023
- **Founders**: Bing Wu (CEO), Todd Li (COO), Evie Wang (CTO), Weijia Yu (President), Zexia Zhang (CMO)

## Core Business
- **Primary industries**: Contact Center Automation, AI Voice Agents, Conversational AI, Enterprise Communication Software
- **Target customers**: B2B (enterprise, healthcare, insurance, automotive, SMBs)
- **Mission**: "A world where every business call is handled by AI that actually gets it right."

## Products & Services
- **AI Voice Agent Platform (SaaS)**: Drag-and-drop agentic framework to build, deploy, and manage AI voice agents for inbound (support, routing, appointment booking) and outbound (reminders, lead qualification, surveys) calls. Includes:
  - Real-time function calling (book, pay, update records, transfer)
  - Proprietary turn-taking model and ultra-realistic voices
  - Streaming RAG with auto-sync knowledge base
  - Performance analytics dashboard
  - Batch calling with conversion tracking
  - SIP trunking (connect to any telephony)
  - Enterprise on-prem deployment option
  - Compliance: HIPAA, SOC 2 Type II, GDPR; SSO; PII redaction; role-based access

## Market Standing
- **Valuation**: Not publicly available
- **Key Metric**: $40M annualized revenue (fully profitable as of 2025)
- **Total Funding**: $9.4M (including $4.6M seed round led by Alt Capital, backed by Y Combinator and angel investors)
- **Headcount**: ~69 employees (175% YoY growth)
- **Notable Investors/Partners**: Alt Capital (lead seed), Y Combinator

## Competitive Advantages
- **Proprietary Voice AI Orchestration**: Built from the ground up for sub-second latency (~600ms) and natural turn-taking, not stitched-off APIs.
- **Scalability**: Battle-tested infrastructure handling millions of calls reliably.
- **Enterprise Security**: HIPAA/SOC2/GDPR certified, on-prem deployment, SSO, redaction.
- **High Capital Efficiency**: $40M ARR with only 25 employees at time of reaching that milestone.

## Strategic Focus
- Replace traditional call centers by shifting from human-staffed support to AI-handled routine calls, with human escalation for complex cases.
- Continue improving low-latency, agentic voice models and expanding enterprise feature set (batch calling, analytics, compliance).
- Scale customer base across healthcare, insurance, and other regulated verticals.

## Why Work Here
- **Culture**: Small, high-ownership teams; >$1M revenue per employee; "ship fast" — no committees, ship this week if you can make the case.
- **Work Environment**: In-office in San Carlos (on purpose — speed and collaboration on hard problems).
- **Benefits**: Competitive equity packages, health/dental/vision insurance, meal stipends, relocation support, visa sponsorship (H-1B and other work visas).
- **Tech Stack**: Backend in TypeScript and Python, ML in Python, Frontend in React.
- **Interview Process**: Conversations with co-founders, deep on product thinking and technical ability, transparent and fast.

## Sources
1. [retellai.com](https://www.retellai.com/)
2. [retellai.com/about-us](https://www.retellai.com/about-us)
3. [retellai.com/careers](https://www.retellai.com/careers)
4. [linkedin.com/company/retellai](https://www.linkedin.com/company/retellai)
5. [cbinsights.com/company/retell-ai](https://www.cbinsights.com/company/retell-ai)

## Other roles at Retell AI

- [Forward Deployed Engineer, Intern](https://feeny.ai/job/forward-deployed-engineer-intern-retell-ai-san-francisco-sdkx41we6vgb) — San Francisco, CA
- [Founding Strategic Partnerships, Cloud & Alliances](https://feeny.ai/job/founding-strategic-partnerships-cloud-alliances-retell-ai-san-francisco-teynheaq1qm7) — San Francisco, CA
- [Compliance Engineer](https://feeny.ai/job/compliance-engineer-retell-ai-san-francisco-3mdsygdph1ys) — San Francisco, CA
- [SEO Strategist/Growth SEO Lead](https://feeny.ai/job/seo-strategist-growth-seo-lead-retell-ai-san-francisco-bm5es33g3pmt) — San Francisco, CA
- [Applied AI Engineer (Customer Facing)](https://feeny.ai/job/applied-ai-engineer-customer-facing-retell-ai-san-francisco-m97dr8dazek5) — San Francisco, CA
- [Forward Deployed Engineer, New Grad](https://feeny.ai/job/forward-deployed-engineer-new-grad-retell-ai-san-francisco-y4awhc8578g4) — San Francisco, CA
- [Telephony Engineer - Remote](https://feeny.ai/job/telephony-engineer-remote-retell-ai-remote-7h5qb6e177t6)
- [Deployment Consultant - Singapore](https://feeny.ai/job/deployment-consultant-singapore-retell-ai-singapore-1m6as0mb6d7d) — Singapore
- [Deployment Consultant - Hong Kong](https://feeny.ai/job/deployment-consultant-hong-kong-retell-ai-hong-kong-jqwdzaew9dbw) — Hong Kong, China
- [Senior Strategic Deployment Manager - Singapore](https://feeny.ai/job/senior-strategic-deployment-manager-singapore-retell-ai-singapore-9659k4wx70ht) — Singapore