Retell AI
Founding Senior Software Engineer (Frontend)
Retell AI, San Francisco, California, United States, 94199
About Retell AI
At Retell AI, we're not just automating calls-we're transforming how the world communicates. Our AI voice agents are reshaping sales, support, and customer engagement for leading brands. Backed by Alt Capital, Y Combinator, and top-tier investors, we've raised $4.7M in seed funding and hit $14M ARR with just 12 people.
We're one of the fastest-growing Voice AI startups and we're on a mission to become the standard for voice automation at scale. We're also one of the top ranking startups at https://leanaileaderboard.com/.
About the Role
As a Founding Senior Frontend Engineer, you'll shape the user experience of our AI voice platform, building intuitive interfaces and tools that power millions of automated conversations. You'll work across the stack, focusing on React and TypeScript, and collaborate with the founding team to deliver fast, beautiful, and scalable solutions.
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 You 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 Job Type : Full-time, 70 hr/week (50 hr/week onsite with flexible hours + 20 hr/week work from home) Cash:
215k - 290k Equity : 0.25 - 0.45% Location : Redwood City, CA, US US Visas : Sponsors Visa & Green Card Other Benefits 100% medical, dental, vision insurance coverage Unlimited breakfast, lunch, dinner, and snacks Gym and daily commute fee reimbursement Internet and phone bill covered 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 high performers. High Ownership:
Small teams, >$1M revenue/employee, and significant equity. Performance-Based : Offers tied to interview performance, not experience or past salaries. Interview Process Online Assessment (25-30 min) : One HackerRank coding questions on practical problem-solving (7 days to complete). Technical Phone Interview 1 (30 min) : Live coding on CoderPad, focusing on data structures and algorithms. Technical Phone Interview 2 (30-45 min) : Full-stack development with JavaScript, TypeScript, React, and Node.js in a local environment. 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 in a local react environment. 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.
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.
At Retell AI, we're not just automating calls-we're transforming how the world communicates. Our AI voice agents are reshaping sales, support, and customer engagement for leading brands. Backed by Alt Capital, Y Combinator, and top-tier investors, we've raised $4.7M in seed funding and hit $14M ARR with just 12 people.
We're one of the fastest-growing Voice AI startups and we're on a mission to become the standard for voice automation at scale. We're also one of the top ranking startups at https://leanaileaderboard.com/.
About the Role
As a Founding Senior Frontend Engineer, you'll shape the user experience of our AI voice platform, building intuitive interfaces and tools that power millions of automated conversations. You'll work across the stack, focusing on React and TypeScript, and collaborate with the founding team to deliver fast, beautiful, and scalable solutions.
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 You 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 Job Type : Full-time, 70 hr/week (50 hr/week onsite with flexible hours + 20 hr/week work from home) Cash:
215k - 290k Equity : 0.25 - 0.45% Location : Redwood City, CA, US US Visas : Sponsors Visa & Green Card Other Benefits 100% medical, dental, vision insurance coverage Unlimited breakfast, lunch, dinner, and snacks Gym and daily commute fee reimbursement Internet and phone bill covered 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 high performers. High Ownership:
Small teams, >$1M revenue/employee, and significant equity. Performance-Based : Offers tied to interview performance, not experience or past salaries. Interview Process Online Assessment (25-30 min) : One HackerRank coding questions on practical problem-solving (7 days to complete). Technical Phone Interview 1 (30 min) : Live coding on CoderPad, focusing on data structures and algorithms. Technical Phone Interview 2 (30-45 min) : Full-stack development with JavaScript, TypeScript, React, and Node.js in a local environment. 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 in a local react environment. 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.
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.