Agent Experience Designer, Voice (Multilingual)
AI summary of the role
Sierra is hiring a multilingual voice experience designer to shape and scale high-quality voice interactions across a global portfolio of AI agents.
What you’ll do
- Evaluate, compare, and iterate on voices across multiple providers, languages, and use cases to ensure clarity, naturalness, and appropriateness.
- Partner with product, engineering, and deployment teams to research solutions, evaluate options, and guide voice-related decisions for timely multilingual launches.
- Create and maintain structured methods for assessing voice performance and interaction quality.
- Collaborate cross-functionally to investigate quality gaps, diagnose root causes, and drive improvements.
What you’ll bring
- 5+ years in voice/AI experience design, conversation design, applied linguistics, UX for AI, or related role blending product craft with systems thinking.
- Strong ability to operate across many languages and priorities, bringing structure to ambiguity.
- Experience creating repeatable evaluation frameworks (rubrics, test suites, scorecards, QA gates).
- Excellent communication skills for turning messy signals into clear guidance for engineering, product, and customer stakeholders.
Technologies
voice AI · speech synthesis · conversational agents · evaluation frameworks · multilingual
About Sierra
Conversational AI agent platform for enterprise customer service, spanning chat and voice across finance, healthcare, retail, and media.
Series C
Source and classification
Internal deployment & tooling · Evidence for this classification:
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. What you’ll do You’ll help shape and scale high-quality voice experiences across a global portfolio of AI agents. Working closely with cross-functional teams and customer stakeholders, you’ll combine systems thinking, design judgment, and operational rigor to improve voice quality, accelerate multilingual readiness, and create more human experiences. Improve breadth and depth of voice quality: Evaluate, compare, and iterate on voices across multiple providers, languages, and use cases, ensuring experiences meet a high bar for clarity, naturalness, and appropriateness while continuously improving product and systems.
More from the job description
About us At Sierra, we’re building a platform to enable every company in the world to build better, more human customer experiences with AI. We partner with industry leaders such as SoftBank, Uber, Rivian, CLEAR, and Sutter Health. 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 Family. 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. What you’ll do You’ll help shape and scale high-quality voice experiences across a global portfolio of AI agents. Working closely with cross-functional teams and customer stakeholders, you’ll combine systems thinking, design judg [... source excerpt omitted ...] engineering, product, and support teams to investigate quality gaps, diagnose root causes, and drive improvements through clear recommendations and follow-through. Participate in customer-facing voice design work: Contribute to voice selection and design discussions with customers, helping them understand options, tradeoffs, and best practices while ensuring outcomes align with their goals. Enable teams to scale voice design effectively: Design and develop guidance, examples, lightweight frameworks, and product enhancements, that empower product managers and engineers to make strong voice and interaction decisions independently. Co-create agent personas and interaction pattern [... source excerpt omitted ...] brics, test suites, scorecards, QA gates) and using them to drive decisions. Excellent communication: you can turn messy signals into clear guidance for engineering, product, and customer stakeholders. Comfort living close to the work: deep knowledge of the product, understanding our customers and our customers’ customers, always listening, digging into edge cases, constantly improving the system as well as the product. Even better… Experience with speech synthesis and conversational agents. Expertise with global language families. Familiarity with provider and voice evaluation. Linguistics, sound editing, and/or musical background. Experience enabling other teams via pla
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