Sierra · 2 days ago
Agent Experience Designer, Voice (Multilingual)
San Francisco, CA
Full-time
Onsite
Senior Level
$190K/yr - $290K/yr
5+ years expSierra is creating a platform to enhance customer experiences with AI, and they are seeking an Agent Experience Designer to shape high-quality voice experiences. The role involves collaborating with cross-functional teams to improve voice quality, support multilingual readiness, and contribute to customer-facing voice design work.
Artificial Intelligence (AI)Enterprise SoftwareSaaS
Responsibilities
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
Support faster multilingual readiness and launches: Partner with product, engineering, and deployment teams to research solutions, evaluate options, identify risks, and guide voice-related decisions that enable timely, high-confidence launches across regions
Design and apply effective and repeatable evaluations: Create and maintain structured methods for assessing voice performance and interaction quality, helping teams make informed tradeoffs and catch issues early
Partner cross-functionally to resolve voice and interaction issues: Collaborate with 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 patterns: Work with internal teams and customers to shape agent personalities, behaviors, and interactions, supporting distinct and intentional agent experiences as a trusted advisor
Capture and share learnings: Document insights, patterns, and regional considerations to improve consistency, reduce repeated effort, and raise the overall quality bar across teams and deployments
Qualification
Required
5+ years in a role that blends product craft with applied systems thinking (e.g., voice/AI experience design, conversation design, applied linguistics, UX for AI, product engineering with strong user experience focus, localization program leadership with quality ownership)
Strong ability to operate across many languages and priorities—you bring structure to ambiguity and can ship reliably while quality stays high
Experience creating repeatable evaluation frameworks (rubrics, 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
Preferred
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 playbooks, training, and internal tooling
Benefits
Flexible (Unlimited) Paid Time Off
Medical, Dental, and Vision benefits for you and your family
Life Insurance and Disability Benefits
Retirement Plan (e.g., 401K, pension) with Sierra match
Parental Leave
Fertility and family building benefits through Carrot
Lunch, as well as delicious snacks and coffee to keep you energized
Discretionary Benefit Stipend giving people the ability to spend where it matters most
Free alphorn lessons
Company
Sierra
Sierra provides a platform that builds and manages conversational AI agents for customer experiences.
201-500 employees
H1B Sponsorship
Sierra has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (11)
2024 (2)
Funding
Current Stage
Growth StageTotal Funding
$635MKey Investors
SoftBank Vision FundGreenoaksBenchmark,Sequoia Capital
2025-12-04Series Unknown
2025-09-04Series Unknown· $350M
2024-10-28Series Unknown· $175M
Leadership Team
Bret Taylor
Co-Founder
Recent News
Tech Startups - Tech News, Tech Trends & Startup Funding
2026-01-23
Company data provided by crunchbase