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Sierra

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Overview

Sierra helps businesses build better, more human customer experiences with AI. The company offers a conversational AI platform that lets businesses build AI agents, with or without engineering support, and deploy a single agent across chat, SMS, WhatsApp, email, voice, and ChatGPT.

Its Ghostwriter tool builds multilingual, multichannel agents from inputs such as SOPs, transcripts, and audio recordings, while its Insights tools cover performance analysis, monitoring, multivariate experiments, and observability. A component called Horizon supports long-horizon planning, customer memory across touchpoints, and proactive engagement workflows. Sierra uses outcome-based pricing, so customers pay for the results its agents deliver.

Sierra was started in San Francisco and has offices in New York, Atlanta, London, Singapore, Tokyo, Paris, Madrid, and Toronto. Its customers include Clear, Casper, and Minted.

Funding rounds

Disclosed funding: $1.7B across 9 rounds. Latest: Series E, 4 May 2026.

3 rounds have an undisclosed amount, not included in the total.

DateTypeAmount
4 May 2026Series E$950M
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Office locations

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Recent posts from the Sierra blog

Sierra FAQ

As of 2026-10-19, Sierra has 515 employees, based on the Enrich Layer count of person profiles that list Sierra as their current employer. Its listed company size band is 1,001 to 5,000.
As of 2026-10-19, Sierra is headquartered in San Francisco, California, US.
As of 2026-10-19, Sierra is classified in the Software Development industry.
Sierra helps businesses build better, more human customer experiences with AI.
As of 2026-10-19, Sierra's official website is https://sierra.ai/.
As of 2026-10-19, Sierra is a privately held company.