Senior Frontend Software Engineer

About Retell Ai Retell AI is using first principles to reimagine the call center with cutting-edge voice AI. 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 $60M ARR with a team of 40 people, up from $5M at the start of 2025. 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 can act as frontline agents, QA analysts, and managers continuously executing, monitoring, and improving customer interactions. We’re growing quickly and looking for ambitious builders who want to tackle hard technical problems, move fast, and have real impact at one of the fastest-growing voice AI startups. Let’s build the future together. We’re a top 50 AI app in a16z list: https://tinyurl.com/5853dt2x#4 on Brex's Fast-Growing Software Vendors of 2025: https://www.brex.com/journal/brex-benchmark-december-2025We're also one of the top ranking startups on: https://leanaileaderboard.com/Enterprise tech 30: https://www.wing.vc/et30/overview 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. 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 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 Cash: 200k - 300kEquity: Offers Meaningful EquityLocation: Redwood City, CA, USUS Visas: Retell AI is open to sponsoring work authorization for qualified candidates, including 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 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 approachOnsite/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.