Bret Taylor

Bret is Co-Founder of Sierra. Most recently, he served as Co-CEO of Salesforce. Prior to Salesforce, Bret founded Quip and was CTO of Facebook. He started his career at Google, where he co-created Google Maps. Bret serves on the board of OpenAI.

Publicaciones de Bret Taylor

Julia Brau Donnelly joins Sierra as Chief Financial Officer

We are excited to announce that Julia Brau Donnelly will be joining Sierra as our Chief Financial Officer.

31 de agosto de 2026

The word "Personas" on a blurred red, yellow and pink background

Introducing Voice Personas

What an agent does and how it expresses itself are two different things. Today, we’re launching Voice Personas so you can design both.

7 de agosto de 2026

The word "Horizon" on a blurred blue background

The next Horizon in agents

Horizon agents orchestrate outbound and inbound interactions over days or weeks — not just single conversations. A context engine and long-horizon planning turn every interaction into a compounding advantage, so your agents get smarter as your customer relationships deepen. It's Sierra's outcomes-based model at scale: you pay for results, not tokens.

16 de julio de 2026

Certified FedRAMP® High

We're excited to share that Sierra has been certified FedRAMP® High — the standard for cloud companies working with U.S. federal agencies.

10 de junio de 2026

Better customer experiences. Built on Sierra

We’re raising $950 million from new and existing investors, at a valuation of over $15 billion.

4 de mayo de 2026

Sierra acquires Fragment in France

We are excited to announce the acquisition of Paris-based Fragment, which helps businesses scale their operations using AI, freeing up employees to focus on higher value work.

23 de abril de 2026

Eric Eyken-Sluyters joins Sierra as President of Field Operations

We are excited to announce that Eric Eyken-Sluyters will be joining Sierra to lead our global Sales, Sales Engineering, and Partnerships teams.

1 de abril de 2026

Sierra acquires Opera Tech in Japan

Today, we’re announcing that Sierra has acquired Opera Tech, a Tokyo-based enterprise AI startup.

27 de marzo de 2026

Agents as a Service

Sierra is reimagining software for the agent era—where you simply describe the outcome, and intelligent agents build, execute, and continuously improve the work for you. Meet Ghostwriter, the agent that creates and optimizes other agents, turning your ideas into production-ready customer experiences without clicks, code, or complexity.

25 de marzo de 2026

White text "Year two" on a grainy background with diagonal orange, yellow, and blue color gradients.

Year two in review

Sierra is heading into year three with over $150M in ARR, powered by rapid adoption from some of the world’s largest companies. The growth reflects a simple idea: when AI is built around real jobs to be done (not experiments), even the biggest enterprises can see meaningful impact fast.

6 de febrero de 2026

Sierra and Stellarus: Advancing a new model for AI-powered healthcare member experience

Sierra is partnering with Stellarus to help health plans like Blue Shield of California deploy AI agents.

12 de enero de 2026

Sierra hits $100M ARR milestone in 7 quarters

Sierra just hit $100M in ARR — seven quarters after we launched in February 2024. That’s a heck of a lot quicker than we expected, and makes Sierra one of the fastest-growing enterprise software companies in history.

21 de noviembre de 2025

Change agents: Safelite

How Safelite is transforming auto glass services for customers and insurance partners.

18 de noviembre de 2025

Sierra Agent OS 2.0: from answers to memory and action

At Sierra Summit, we unveiled the future of AI agents: a single agent that works across every channel, learns from every interaction, and builds real customer relationships. With eight new products, including Agent Studio 2.0 and the Agent Data Platform, Sierra is turning the promise of AI-powered customer experience into reality.

5 de noviembre de 2025

There's an agent for that, and it runs on Sierra

Today, we’re announcing that we’ve raised $350M additional capital at a valuation of $10B, led by Greenoaks, which is doubling down on Sierra.

4 de septiembre de 2025

Gradient background with graduation cap icon

Calling new grads: APX year 2

Are you a college senior or recent graduate? If you’re driven to turn AI theory into practice, make an impact, and learn from some of the best in our industry, we’d love to build with you.

2 de septiembre de 2025

Serving customer experience and engineering teams—all from one platform

Sierra’s Agent OS is the only platform that supports both no code and programmatic agent development. Our unique approach enables companies to mix and match—choosing the right approach for their business needs, and scaling their agent development as those needs evolve.

21 de mayo de 2025

Sierra expands to New York

We’re excited to share that Sierra is opening a New York office, and we’re hiring across agent development and sales.

7 de mayo de 2025

Change agents: Minted

Since we first started working together last year, AI has become central to Minted’s long-term innovation strategy—with information from AI conversations helping to inform their marketing, engineering, and product teams, as well as solving real customer needs with care and creativity.

24 de abril de 2025

Sierra acquires Receptive AI

We want to ensure that Sierra has the best voice capabilities, and it’s why we’re excited to have acquired Receptive AI. Their voice technology is already integrated into Sierra, enabling companies to build AI agents once and deploy them across any channel.

26 de marzo de 2025

Announcing the Sierra APX program

The APX program is an 18-month rotational program that gives new graduates in computer science or a related field the opportunity to work closely with our customers, building AI agents as both an Agent Engineer and an Agent Product Manager.

12 de noviembre de 2024

Sierra speaks

Voice is here. Sierra's AI agents can now engage consumers with rich, natural conversations over the phone—no wait times, no frustration. Learn how this new capability is reshaping the future of customer service.

9 de octubre de 2024

The Agent Development Life Cycle

An autonomous AI agent is a new type of software that requires a new approach to development. Sierra has developed a novel, integrated approach to developing agents, from development to testing and release management. We call this the Agent Development Life Cycle.

3 de junio de 2024

The Guide to AI Agents

AI agents are autonomous software systems that can reason, make decisions, and pursue goals with creativity and flexibility. They’ll soon be everywhere, helping consumers, employees, and businesses alike.

23 de mayo de 2024

Meet Sierra, the conversational AI platform for businesses

13 de febrero de 2024

Bret Taylor

Publicaciones de Bret Taylor