Zack Reneau-Wedeen

@SierraPlatform

[Zack Reneau-Wedeen @ZackRW]

We decided to start APX unreasonably early, when Sierra was under 150 people. Now the program is now key to our culture and strategy, thanks to our amazing first two cohorts. If you see some of yourself in this post from Anika and me, I hope you'll consider applying!

[Sierra @SierraPlatform]

As AI got great at coding, many predicted the end of the entry-level job. At Sierra, we thought the opposite.

When AI handles more of the code, the things that matter most are creativity, judgment, and ambition — and new grads have these traits in spades. They are also AI natives: the first generation to grow up with ChatGPT and Claude as everyday tools which gives them a huge advantage in an applied AI company like Sierra.

We believe that these new grads will define the next generation of great companies, so we launched the APX program two years ago. If you’re scrappy, entrepreneurial, and want a high degree of agency, we hope you’ll apply.

Read more: https://t.co/9eQ9yxUZuz

[Bret Taylor @btaylor]

Manat started as an intern, and now she's an engineer building our voice products. She did an amazing demo of Tandem Voice and Persona Studio today. Here we are celebrating with her parents after the keynote.

[Bret Taylor @btaylor]

The way you manage agents on the Sierra platform has evolved from signing into Sierra to engaging with Ghostwriter in Slack. The first time Ghostwriter proactively @-mentions you when it notices an issue or suggests running an A/B test you hadn't thought of, it changes your conception of how enterprise software should work. Really proud of the team that built this https://t.co/2uQzTJK18T

[Aakash Thumaty @letsleverup]

https://t.co/5YqqNncKAj

[Sierra @SierraPlatform]

Since its origins at Palantir, the term "Forward Deployed Engineer" has described wildly different jobs, yet today it's one of the fastest-growing roles in AI.

Check out @natalie_meurer, Head of Agent Engineering at Sierra, at the AI Engineer World's Fair for a historical tour of one of tech's most misunderstood roles, and why its biggest contradiction may explain where the industry is headed next.

🕐Tuesday, June 30 @ 1:30pm | 📍Moscone West, Room 2020

[Vijay Iyengar @vijayiyengar]

https://t.co/B3aaJ9VVjE

[Vijay Iyengar @vijayiyengar]

https://t.co/BpkqIWTEgV

[Neil Rahilly @neilrahilly]

https://t.co/PsyDfxoz1x

[Bret Taylor @btaylor]

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. https://t.co/tR5P4NHu36

[Zack Reneau-Wedeen @ZackRW]

👻 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! 👇

[Bret Taylor @btaylor]

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.

[Sierra @SierraPlatform]

Excited for what's coming later today.

[Sierra @SierraPlatform]

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.

[Sierra @SierraPlatform]

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
https://t.co/rIk8xrj4iD

[Annelies Gamble @AnneliesGamble]

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! https://t.co/X7B2ymiX4E

CC @ZettaVentures

[Bret Taylor @btaylor]

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 https://t.co/IC56DKLIi6

[Granola @meetgranola]

We can't wait to welcome @PeifferPol and @ZackRW from @sierraplatform to Granola HQ on August 5th!

[Sierra @SierraPlatform]

Whether you no code or know code, Sierra helps brands build better, more human customer experiences fast ... and all from one platform. https://t.co/snHVD9PT6K

[Zack Reneau-Wedeen @ZackRW]

@ardabrowski @latentspacepod @SierraPlatform @swyx Hey Andrzej, great question. Our Agent SDK is fully externalized and available to customers, but it's not currently open source.

So that means we have many devs building agents on the platform directly, but at present they all either work for Sierra or for one of our customers.

[Zack Reneau-Wedeen @ZackRW]

@latentspacepod has been my favorite AI podcast for years, and I'm so proud to be part of the team building @sierraplatform, so this was particularly fun to get to talk about Sierra at @swyx's conference.

[AI.Engineer @ CODE @aiDotEngineer]

🆕 One of the most successful agent companies in the world is @SierraPlatform, cofounded by @btaylor who happens to be Chairman of @OpenAI. But they've been relatively stealthy about *how* they build and operate....

until now.

https://t.co/AN8MfD7Kil

We're honored for @ZackRW to pull back the curtain on Sierra's Agent SDLC - or ADLC - for the first time ever!

They're also hiring - at the last World's Fair a chance convo with an attendee led to a fantastic new hire - so talk to Zack for more! even if you're not looking for a job, @sierraplatform is worth a follow on X :)

[Zack Reneau-Wedeen @ZackRW]

@stephenenke The vast majority of our customers today are building for synchronous conversations over the phone, but I think I'm with you. There are definitely other interesting experiences you could design (async, web / mobile app, etc.) if you relax that constraint.

[Zack Reneau-Wedeen @ZackRW]

Remember "m-dot" mobile sites (like https://t.co/yOzjGI8FGe)? 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.

[Sierra @SierraPlatform]

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: https://t.co/Fw6Auua2xH