About
Sierra is an AI platform that enables businesses to create and deploy autonomous AI agents for customer experience. Their Agent OS allows companies to imbue agents with brand identity, policies, and knowledge, setting goals and guardrails for accurate problem-solving. These agents go beyond answering questions, taking real-time actions within CRM or order management systems.
Key facts
At-a-glance profile data
- Website
- sierra.ai
- Founded
- 2023
- Employees
- 277
- Total funding
- $1.6B (Growth)
- Business model
- B2B
Funding rounds
| Date | Round | Amount | Lead investors |
|---|---|---|---|
| 4 May 2026 | Growth | $950M | - |
| 3 Sept 2025 | Series C | $350M | Lightspeed Venture Partners, Sequoia Capital, Coatue |
| 3 Sept 2025 | Series B | $175M | - |
| 6 Mar 2023 | Series A | $110M | Benchmark, Snowhouse, Sequoia Capital |
Tech stack
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- Compliance
- SOC 2, HIPAA, ISO 27001, PCI DSS, GDPR, FedRAMP
- Frontend
- Next.js, Tailwind CSS
- Auth
- Okta
- Observability
- incident.io
- Support
- HubSpot
- AI customer support
- Sierra
- CMS / Builders
- Ghost
- CDN
- Cloudflare, Vercel
- Email provider
- Google Workspace
Frequently asked
What does Sierra do?
Sierra emphasizes trust, security, and compliance, with features like supervision, secure integration, auditing, and data governance, ensuring privacy and deterministic interactions. They serve leading consumer brands across diverse industries, transforming customer support with empathetic, scalable, and efficient AI.
How much funding has Sierra raised?
Sierra has raised a total of $1.6B in funding. The most recent round on record is Growth.
How many employees does Sierra have?
Sierra has approximately 277 people on record.