Sierra is the conversational AI platform for businesses. We help companies elevate their customer experience with AI.
Sierra is the conversational AI platform for businesses. We help companies elevate their customer experience with AI.
Product: Enterprise conversational AI platform (Agent OS: Agent Studio, SDK, Data Platform) for customer support across chat, voice, SMS, email
Founders: Bret Taylor and Clay Bavor
Funding: $635,000,000 total reported
Valuation signals: $4.5B (Oct 2024 round) and ~$10B (Sep 2025 round) reported
Customers / traction: Reported enterprise customers and ~ $100M ARR by Nov 21, 2025
Customer experience and enterprise customer support automation using conversational AI agents.
2023
Software Development
$175,000,000
Round reported at a ~$4.5B valuation
$350,000,000
Round reported at about a $10B valuation
“Participation by Greenoaks Capital, Sequoia, Benchmark, ICONIQ and Thrive Capital reported”
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What you'll do
What you'll bring
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