Sierra
Sierra builds AI agents that handle enterprise customer service at scale.
Sierra builds an Agent OS platform that deploys conversational AI agents across voice, chat, and other channels to handle customer service, sales, and engagement workflows. The platform goes beyond basic chatbots—agents access company data, take actions across enterprise systems like CRM and billing, and maintain context across customer interactions over time. Sierra serves Fortune 50 enterprises and leading brands including Prudential, Cigna, SoFi, and Brex, with agents processing thousands of customer conversations monthly. The company has achieved unprecedented growth, reaching $150M ARR in eight quarters and serving over 40% of the Fortune 50.
Problem solved
Large enterprises handle millions of customer interactions monthly but lack efficient ways to automate support while maintaining context, taking actions across systems, and delivering personalized experiences.
Target customer
Enterprise companies (Fortune 50 and large mid-market) in financial services, insurance, telecom, and e-commerce seeking to automate customer service, support, and engagement workflows.
Founders
B
Bret Taylor
Co-Founder & CEO
Former Co-CEO of Salesforce, founder of Quip, CTO at Facebook, co-creator of Google Maps at Google, board member of OpenAI.
C
Clay Bavor
Co-Founder
Spent nearly two decades at Google leading Google Labs, Google Lens, and AR/VR initiatives including Project Starline.
Funding history
Seed
$110M
February 2024
Led by Sequoia Capital
· Benchmark
Series B
$175M
October 2024
Led by Greenoaks Capital
· Unknown
Series C
$350M
September 2025
Led by Greenoaks Capital
· Unknown
Series D
$950M
May 2026
Led by Tiger Global
· Google Ventures, Benchmark, Sequoia, Greenoaks
Total raised:
$1.585B
Industries
Pricing
Outcome-based pricing model where customers pay when agents successfully resolve cases. Custom pricing with estimated first-year costs of $200K+. Detailed pricing not publicly disclosed.
Notable customers
Prudential, Cigna, Blue Cross Blue Shield, Rocket Mortgage, SoFi, Ramp, Brex, WeightWatchers, SiriusXM, Sonos, OluKai, one in three of world's largest banks
Integrations
CRM systems, order management systems, billing systems, inventory systems, enterprise data platforms
Tech stack
React (JavaScript frameworks)
Next.js (Web servers)
Webpack
Open Graph
Sanity (CMS)
Google Analytics (Analytics)
Google Ads Conversion Tracking (Analytics)
Linkedin Insight Tag (Analytics)
Sentry (Issue trackers)
Cloudflare Bot Management (Security)
HSTS (Security)
Node.js (Programming languages)
Google Workspace (Email)
Cloudflare (CDN)
HubSpot (Marketing automation)
Google Ads (Advertising)
OneTrust (Cookie compliance)
Priority Hints (Performance)
Website
Competitors
Intercom
Broader customer communication platform with messaging and ticketing; Sierra focuses specifically on AI agents with enterprise system integration.
Zendesk
Traditional customer service platform with AI add-ons; Sierra's Agent OS provides native AI-first architecture with deeper enterprise system action-taking capabilities.
Amazon Connect
AWS contact center platform; Sierra is cloud-agnostic with specialized focus on conversational AI agents and autonomous problem resolution.
Why this matters: Sierra has achieved unprecedented growth for enterprise software, reaching $150M ARR in eight quarters with backing from top-tier investors (Sequoia, Tiger Global, Google Ventures). The company is pioneering a new category of autonomous AI agents that go far beyond chatbots to take meaningful business actions, addressing a massive market need in enterprise customer service automation.
Best for: Large enterprises handling high-volume customer interactions who need AI agents that can understand company-specific context, take autonomous actions across business systems, and maintain conversation continuity across channels and time.
Use cases
Insurance Claims Processing
Insurance companies like Cigna and Blue Cross use Sierra agents to handle customer inquiries about claims, coverage, and policies. Agents access policy databases, take actions like initiating claims, and route complex cases to humans—reducing support costs and processing time.
Financial Services Customer Support
Banks and fintech companies like SoFi and Brex deploy Sierra agents to handle account inquiries, transaction questions, and service requests. Agents integrate with core banking systems to check balances, initiate transfers, and update account settings autonomously.
E-Commerce Order Management
Retailers use Sierra agents to handle customer service for order issues—processing exchanges, scheduling deliveries, managing returns, and updating subscriptions. Agents access inventory and order systems to provide real-time status and take immediate action.
Telecom Customer Service
Companies like SiriusXM use Sierra agents to handle subscription management, technical support, and billing inquiries across voice and chat. Agents can modify subscriptions, process upgrades, and troubleshoot issues without human intervention.
Alternatives
Intercom
Choose Intercom for broader customer communication platform needs; choose Sierra if you specifically need autonomous AI agents that take actions across enterprise systems.
Genesys Cloud
Choose Genesys for comprehensive contact center infrastructure; choose Sierra for specialized AI agent capabilities with tighter enterprise system integration.
Custom LLM Solutions
Choose custom LLM development if you have unlimited engineering resources; choose Sierra for a pre-built platform with enterprise integrations and outcome-based pricing.
FAQ
What does Sierra do? +
Sierra builds an AI Agent OS platform that deploys conversational agents across voice, chat, and other channels. These agents understand company-specific data, take autonomous actions across business systems (CRM, billing, inventory), and maintain context across customer interactions over time. The platform enables enterprises to automate customer service, support, and engagement at scale.
How much does Sierra cost? +
Sierra uses outcome-based pricing where you pay when agents successfully resolve customer cases. Pricing is custom and not publicly listed. Estimated first-year costs are $200K+. Contact Sierra directly for specific pricing based on your use case and volume.
What are alternatives to Sierra? +
Intercom offers broader customer communication platform capabilities. Zendesk provides traditional customer service with AI add-ons. Amazon Connect is a cloud-based contact center. Genesys Cloud offers comprehensive contact center infrastructure. Custom LLM solutions provide maximum flexibility but require significant engineering investment.
Who uses Sierra? +
Enterprise companies in financial services, insurance, telecom, and e-commerce use Sierra. Notable customers include Prudential, Cigna, Blue Cross Blue Shield, Rocket Mortgage, SoFi, Brex, and WeightWatchers. Sierra serves over 40% of the Fortune 50 and one in three of the world's largest banks.
How does Sierra compare to traditional customer service platforms like Zendesk? +
Sierra is built as an AI-first platform with Agent OS at its core, whereas Zendesk is a traditional customer service suite with AI features added on. Sierra's agents integrate deeply with enterprise systems to take autonomous actions (process orders, update accounts, initiate transactions), while Zendesk focuses on ticket management and routing. Sierra's outcome-based pricing aligns cost with resolution value, while Zendesk uses seat-based or volume-based models.
Tags
conversational AI
enterprise AI
customer service automation
AI agents
autonomous agents
voice AI
enterprise software