Design Engineer - AI-First UI & Design System

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

• Top 50 AI Apps, a16z (2025)

• #3 Fastest-Growing Software Company, G2 Best Software Awards 2026

• Best Agentic AI Software, G2 Best Software Awards 2026

• #4 Fastest-Growing Software Vendor, Brex Benchmark 2025

• Enterprise Tech 30 Class of 2026, Nasdaq & Wing VC

• Top-Ranked Startup, Lean AI Leader board

• Backed by Y Combinator

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!

Retell is hiring a Design Engineer to own the bridge between design and code.

You will build and maintain our design system, prototype in code, implement UI primitives, and ensure that what ships looks exactly like what was designed. AI tools are a first-class part of how you work, not a side experiment. You will collaborate closely with our product designer and work across the engineering team to raise the quality bar on every product surface.

This is a role for someone who cares as much about the craft as the output. You ship real components to a real product used by thousands of companies running AI voice agents at scale.

KEY RESPONSIBILITIES

• Work AI-first: use Cursor and Claude Code as your starting point for component work, with your own judgment refining quality

• Build and own the Retell design system: component library, Storybook, design tokens, and Figma variables

• Prototype in React and Type Script and test with real users before full systemization

• Translate Figma designs into production-grade components with pixel-level accuracy

• Own design-code parity across Retell's core product: dashboard, agent config, CRM views

• Review frontend PRs for visual quality, not just functionality

• Document and share AI-native prompts and workflows with the design and engineering team

• Partner with the product designer to evolve the visual language as the product scales

YOU MIGHT THRIVE IF

• You have built or significantly contributed to a design system at a real product

• You are fluent in Figma and know how to maintain a component library at scale

• You write clean React + Type Script and care about component API design

• You actively use Cursor, Claude Code, or similar tools and have clear opinions on how to get good output

• You prototype in code rather than waiting for pixel-perfect specs

• You notice when spacing is off and can't leave it alone

• Designers and engineers both love working with you

• You thrive in fast-moving products where specs evolve mid-build

WHAT WE ARE LOOKING FOR

Must have

• Strong Figma skills: component library, variables, auto layout

• Solid frontend: HTML, CSS, React, Type Script

• Experience building and maintaining…