Sierra
Series E+ · SF Bay Area
Customer support · B2B · AI-native
Conversational AI platform for customer experience
Sierra builds a platform companies use to create customer experiences with AI that behave less like deflection and more like service. It partners with organisations including SoftBank, Uber, Rivian, CLEAR and Sutter Health — a spread that suggests the problem is structural rather than sector-specific. The company is primarily in-person from San Francisco with offices across North America, Europe and Asia. It was co-founded by Bret Taylor, previously co-CEO of Salesforce, CTO of Facebook and a co-creator of Google Maps, and Clay Bavor, who spent eighteen years at Google leading Google Labs, Project Starline and Google Lens.
sierra.ai (opens in a new tab)Last round
$950MSeries EMay 2026
Led by Tiger Global and GV
Recent raises