Directory / Customer Support & CX Agents
Sierra
Conversational AI agents for customer experience
Headcount
1,164
▲ 29.6%▲ 63.5%3m · 6m
src: Clay (LinkedIn headcount)
X followers
13.6K
——7d · 30d
src: X API public metrics 2026-11-04
Traffic / month
237.2K
src: Semrush
// profile
Product
- Pricing
- Outcome-based pricing · from not published
- HQ
- San Francisco, California, United States
- Founded
- —
- Profile ↗
// capital
Funding
- Date
- May 4, 2026
- Source
- Announcement ↗
- Investors
- Benchmark, Greenoaks Capital, ICONIQ, Sequoia Capital, Thrive Capital
// team
Hiring
- Employees
- 1,164
- Growth 3m / 6m
- +29.6% / +63.5%
- Open roles (sample)
- Software Engineer, Agent
- ソフトウェアエンジニア（AIエージェント）
- Engineering Manager (Japanese Speaking)
- Technical Product Manager（AIエージェント）
- Strategist, Agent Development - Travel, Transportation and Hospitality
- Compensation Partner
- Recruiter
- Office Coordinator
- X mentions this week
- 178
- X handle
- @SierraPlatform
src: Clay (LinkedIn headcount)
src: Clay (LinkedIn headcount)
src: Clay open jobs
src: X API public metrics 2026-11-04
// x.com
Top launch posts
- Oct 6, 2026 · launch · 1,153 eng.Announces Personal Agent Protocol, an open standard with Meta, Shopify, Stripe, Walmart and others
- Oct 30, 2026 · other · 194 eng.Says Sierra passed $400M+ ARR, adding $150M+ in Q3 (company metric)
- Oct 30, 2026 · other · 145 eng.Links only, no text to classify (same day as ARR post)
- Oct 9, 2026 · launch · 135 eng.First draft of Personal Agent Protocol (Poppy) published, plus 35 new design partners
- Oct 8, 2026 · customer · 132 eng.Demo of Redfin and Rocket agents using Poppy for home search and mortgage pre-approval
- Oct 26, 2026 · launch · 105 eng.Explains how Poppy lets companies control how personal agents interact with them
- Oct 14, 2026 · launch · 40 eng.Introducing Sierra’s partner ecosystem: the technology platforms, marketplaces, and service partners bringing Sierra to more businesses around the world. Excited to work with companies that share our
- Oct 21, 2026 · launch · 26 eng.How well do voice agents work across languages — and how natural do they sound? Today we’re introducing 𝜏-i18n (pronounced tau-internationalization), which extends 𝜏-Voice to five more languages: Spa
// press
Recent news
// awaiting data
No news tracked yet
This view fills in automatically once the weekly dataset is loaded.
// provenance
Sources
- Profile
- https://sierra.ai/
- Headcount
- Clay (LinkedIn headcount)
- Open jobs
- Clay open jobs
- Traffic
- Semrush
- Pricing
- —
- X metrics
- X API public metrics 2026-11-04
- X handle (homepage-verified)
- —
- x_buzz
- X API recent counts, 7 days to 2026-11-04
- profile
- https://sierra.ai/
// faq
About Sierra
What does Sierra do?+
Conversational AI agents for customer experience
How much has Sierra raised most recently?+
Series E of $950M on May 4, 2026, led by Tiger Global, GV.
How many employees does Sierra have?+
About 1,164 (3-month growth +29.6%).
How is Sierra priced?+
Outcome-based pricing, starting at not published.