Joined September 2009
38 Photos and videos
Zack Reneau-Wedeen retweeted

1
8
33
4,821
Zack Reneau-Wedeen retweeted

2
4
19
56,378
Zack Reneau-Wedeen retweeted

6
38
308
30,832
Zack Reneau-Wedeen retweeted
I’m excited to announce that Sierra has acquired Opera Tech in Japan. Opera’s co-founders, Keita Morikawa and Kiyo Kunii, started the company with the simple idea that AI could help businesses deliver high-quality customer experiences at scale. We’re so excited to have them join us to lead Sierra in Japan. sierra.ai/blog/sierra-acquir…
16
45
540
213,694
👻 We're launching Ghostwriter today! 👻 After spending the past 2 years building agents by hand, I think this is as big a deal for agent building as Codex and Claude Code are for software engineering. Check out Bret's demo! 👇
Today, Sierra is releasing Ghostwriter, our agent for building agents. With Ghostwriter, you can create an AI agent for your customer experience — one that can chat, pick up the phone, speak dozens of languages, take action on your systems of record, and be protected with industry-leading guardrails — simply by having a conversation. No clicking, no forms, no menus. Codex and Claude Code have transformed how we build software, making it possible for software engineers to orchestrate and review the work rather than doing all the work themselves. We think the same transformation will happen for all software. Rather than every enterprise app having a web app for humans and an API for automation, every software platform’s UI will be an agent that can do the work on your behalf. I recorded a demo of my building and optimizing an agent with Ghostwriter so you can see how powerful and easy it is to use. It’s completely changed the way our early adopters build agents, and it’s changed the way I think about the software industry. Let me know what you think, and, if you’re interested in trying it out at your business, please reach out directly.
2
10
510
Zack Reneau-Wedeen retweeted
Excited for what's coming later today.
1
14
1,051
Zack Reneau-Wedeen retweeted
19 Dec 2025
The atomic unit of customer experience is no longer a conversation, it's a relationship. This year, our customers didn't just see that shift—they led it.
2
16
2,776
Zack Reneau-Wedeen retweeted
5 Nov 2025
In case you missed it: here’s everything we launched at Sierra Summit. 🚀🏔️ 1⃣Publish to ChatGPT 2⃣Live Assist 3⃣New Journeys 4⃣Workspaces 5⃣Integrations Library 6⃣Explorer 7⃣Expert Answers 8⃣Agent Data Platform sierra.ai/blog/agent-os-2-0
4
9
65
29,739
Zack Reneau-Wedeen retweeted
What does it actually take to build and ship AI products that work at scale? At AI Native Summit 2025, we’re bringing together some of the most experienced product leaders for a candid, tactical conversation about building AI products people actually use: 🎤 Antonia Woodford – Head of Growth, ChatGPT @OpenAI 🎤 Zack Reneau-Wedeen – Head of Product @SierraPlatform 🎤 Eddie Zhou – Founding Engineer @glean 🎤 Selena Wang – Product @Harveyaisol This panel will go deep on: ➡️ Defining and measuring actual value delivered ➡️ Balancing pushing the boundaries of model capabilities with shipping reliable products to enterprise customers ➡️ Surprising lessons learned from shipping AI products ➡️ Choosing different product strategies for vertical vs. horizontal applications And much, much more 📍 September 10, 2025 | @SFJAZZ , San Francisco 🎟 Limited spots left, register now! lnkd.in/gaZis6Fr CC @ZettaVentures
1
10
1,064
Zack Reneau-Wedeen retweeted
19 Aug 2025
Simulations are a new kind of testing for a new kind of software, simulating conversations between AI agents and mock personas ensure reliability at scale sierra.ai/blog/simulations-t…
16
60
672
89,538
Zack Reneau-Wedeen retweeted
30 Jul 2025
We can't wait to welcome @PeifferPol and @ZackRW from @sierraplatform to Granola HQ on August 5th!
1
2
12
3,419
Zack Reneau-Wedeen retweeted
23 Jan 2025
Chat AI? Delightful. Call customer service and get a phone tree? The worst. Product Manager @zackrw explains how Sierra is changing that. 🎥 See how in this Q&A. youtube.com/watch?v=KbfSYdns…
1
6
1,804
Zack Reneau-Wedeen retweeted
23 Jan 2025
We’re thrilled to announce our international expansion with the opening of our third office in London. As a global center of innovation, the UK has long been home to exceptional talent, and we’re excited to grow our presence and collaborate with the best. 🇬🇧 Think you’re a match? Discover open roles: jobs.ashbyhq.com/Sierra/1a06…
3
4
28
9,722
Remember "m-dot" mobile sites (like m.company.com)? Now, websites are responsive, adapting to screen size & device. We applied this concept to Agent OS: no matter how customers reach out—phone, chat, email, or text—Sierra agents are always responsive & ready to help.

22 Jan 2025
Build once. Deploy everywhere. From chat to voice to email, Sierra agents adapt to every channel your customers use. 🎥 Our Product Manager, @zackrw, explains how in this quick Q&A: youtube.com/watch?v=TDmgGXbU…
1
3
490
Nobody likes waiting on hold, but companies don't like putting you on hold either. Now they can pick up the phone right away, every time.
9 Oct 2024
Today we're excited to announce a new way to interact with Sierra agents: voice. Learn more about how this new capability is transforming customer interactions in our latest blog post.: sierra.ai/blog/sierra-speaks
3
550
Zack Reneau-Wedeen retweeted
9 Oct 2024
Sierra AI agents can now pick up the phone sierra.ai/blog/sierra-speaks
13
29
315
95,591
Zack Reneau-Wedeen retweeted
4 Oct 2024
Sierra partnered with @Casper to launch Luna 2.0, their AI agent delivering 24/7 personalized customer support. From helping with mattress purchases to driving lifelong loyalty, Luna 2.0 is transforming the shopping experience!💤✨️ Learn more: sierra.ai/customers/casper
5
17
7,833
Now that Sierra AI agents are resolving customer issues empathetically and performantly at scale for so many different businesses, I'm excited to share key learnings in this post.
25 Jul 2024
Sierra AI agents are transforming customer experiences - helping to set up Sonos speakers, refresh SiriusXM radios, and process OluKai shoe returns and exchanges. We've packaged up some of our lessons learned from building AI agents at scale. sierra.ai/blog/shipping-and-…
1
519
Zack Reneau-Wedeen retweeted
20 Jun 2024
Sierra's research team just published 𝜏-bench, a novel new benchmark to evaluate AI agents' performance and reliability in real-world settings. The results show that that agents built with simple LLM constructs (like function calling or ReAct) perform poorly on even relatively simple tasks, highlighting the need for more sophisticated agent architectures like the approach we've taken with Sierra's Agent OS. sierra.ai/blog/benchmarking-…

11
19
154
52,371