AI Voice Designer

About us Sierra is the leading platform for customer-facing AI agents, working with many of the world's biggest brands — including The GAP, Rocket Mortgage, SoFi, Sutter Health, and SoftBank — to transform how they serve customers and grow their businesses. We are primarily an in-person company based in San Francisco, with growing offices across North America, Europe, and Asia. We are guided by a set of values that are at the core of our actions and define our culture: Trust, Customer Obsession, Craftsmanship, Intensity, and a commitment to balancing Family along the way. These values are the foundation of our work, and we are committed to upholding them in everything we do. Our co-founders are Bret Taylor and Clay Bavor . Bret currently serves as Board Chair of OpenAI. Previously, he was co-CEO of Salesforce (which had acquired the company he founded, Quip) and CTO of Facebook. Bret was also one of Google's earliest product managers and co-creator of Google Maps. Before founding Sierra, Clay spent 18 years at Google, where he most recently led Google Labs. Earlier, he started and led Google’s AR/VR effort, Project Starline, and Google Lens. Before that, Clay led the product and design teams for Google Workspace. About the role Voice is one of the most demanding and important surfaces for AI agents. How an agent sounds – its warmth, tone, pacing, accent, and personality – is often the first and most lasting impression a customer has of a brand. Getting it right is equal parts craft, taste, and technical execution. We're looking for a technical Voice Designer to own that craft. This is a forward-deployed role: you'll work hand-in-hand with Sierra's customers to develop, build, launch, and continuously improve the voices our agents use across our European locales. You are the person who turns a customer's requirements into a living, production-quality AI voice. You’ll work closely with our voice platform team to implement and tune voices that run at scale on our infra