Founder/CEO @PulumiCorp · Dev tools, operating systems, clouds, distributed systems · .NET guy in past life · Eat, sleep, code, repeat.
Joined July 2013
- Tweets 4,438
- Following 981
- Followers 9,205
- Likes 11,161
360 Photos and videos
Pinned Tweet
7 Apr 2025
8 years and we're still just getting started! 🙌
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Jun 9
Next up: agent loops go recursive, and then tail recursion, and then
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Jun 2
Had a fun time keynoting @CascadiaJS. Talk was “the last mile is code,” about how modeling problems as coding problems helps LLMs as they are natural coders.
Amazing community, thank you for having me. Demo code, video, and slides below. Ship something epic🤘
Jun 2
Joined the keynote talk of @funcOfJoe during @CascadiaJS about “the last mile is code” in our new agentic AI area!
He even made a live demo with @PulumiCorp Neo coding agent!
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J☁e Duffy retweeted
May 28
Pulumi is a Platinum sponsor of @cascadiajs, June 1–2 in Seattle.
Come see the @funcOfJoe keynote and @_ediri workshop.
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J☁e Duffy retweeted
May 22
Earlier this week when we wrote about how agents are taking on more of the work of infrastructure, the share was already at 28%. Today it's even higher. Here's how it breaks down across the most popular coding agents:
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J☁e Duffy retweeted
May 22
What do coding agents love more than code? Well-designed CLIs. So in this week's release, we poured some love into the Pulumi CLI — and with it, brought along all of Pulumi Cloud.
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J☁e Duffy retweeted
May 20
Pulumi Neo is now available in the terminal.
As of today, you can run Neo from the command line with the Pulumi CLI, with all the same context it has in Pulumi Cloud, plus give it controlled access to your code and your local development environment.
pulumi.com/blog/pulumi-neo-c…
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May 19
We shipped some stuff today to help agents do better with infrastructure.
20% of operations on our platform are already done by agents, and it's just going to keep growing...
Being in-distribution helps. In the coming weeks, we'll share more data from our new InfraBench.
May 19
Infrastructure is entering its agentic era.
Agents are moving from writing code to operating infrastructure directly, with previews, policy checks, audit trails, and human-review built into the workflow.
pulumi.com/blog/the-agentic-…
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📢 we're hiring an AWS tech lead @supabase 📢
if you're someone who is excellent at Pulumi and knew that AWS have a satellite ground station as a service product without being 🤯 right now, you should apply asap.
we work async and remotely from over 55 countries, very flexible work environment in one of the fastest growing startups of the decade.
jobs.ashbyhq.com/supabase/bf…
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J☁e Duffy retweeted
Apr 13
We’re thrilled to welcome @funcOfJoe, co-founder and CEO of @PulumiCorp, as a keynote speaker at CascadiaJS!
From programming languages to cloud infrastructure, Joe has spent his career building the tools developers use every day.
See him at CascadiaJS, the web AI conference for devs, by devs.
cascadiajs.com/2026
ALT CascadiaJS Web AI Conference. Keynote speaker. Joe Duffy. CEO - Pulumi. June 1 - 2, 2026. Seattle, WA.
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J☁e Duffy retweeted
Apr 8
One of our most requested features just shipped: @bunjavascript as a first-class runtime! Give it a try — `pulumi new bun` and you're good to go. Details in the blog post:
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Mar 31
These supply chain hacks are frightening.
The number of static long-lived secrets kept in CI/CD pipelines like GitHub Actions is equally terrifying.
The combination is deadly.
We developed "zero static secrets" to fix this and there's no going back.
pulumi.com/blog/eliminating-…
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J☁e Duffy retweeted
Mar 5
Exciting launch: Pulumi Cloud can now serve as a Terraform state backend! Migrate your state in minutes — keep using the Terraform CLI while gaining encrypted state, RBAC, audit policies, and unified resource visibility across your entire infrastructure estate.
hubs.ly/Q045PxVF0
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J☁e Duffy retweeted
Feb 21
One of the best (non-coding) vertical agents that I’ve tried is @PulumiCorp’s Neo
“Hey I’m trying to set up cloudshell so it can touch XYZ resource - tell me which existing security group I should give it and which subnets to put it in”
Nailed it on the first try, well done
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Feb 18
New art project: Foundations of LLMs.
71 of the most influential papers in the history of large language models, from McCulloch-Pitts neurons (1943) to modern reasoning systems (2026), curated into a single 2,381-page volume.
Every paper had to clear a high bar: it pioneered a direct ancestor of modern LLMs, or later breakthroughs couldn't have happened without it.
It opens with an artful microGPT portrait inspired by @karpathy. Seeing 200 lines of gorgeous Python before diving into the deep science and math is awe-inspiring.
This book has supplied me many eves of learning and fun thus far and I hope it does for you too.
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Feb 18
⬇️ PDF (Archive.org): archive.org/download/foundat…
⬇️ PDF (G Drive): drive.google.com/file/d/1BEb…
📚 GitHub repo: github.com/joeduffy/foundati…
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Feb 6
We spoke to several people this week who now use our infrastructure agent Neo to do *everything* in the cloud.
They don't look at or touch IaC, cloud consoles, etc.
Agentic clouding is here!
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Feb 6
We also open sourced many skills that make Neo tick so you can use them from any agentic tool:
pulumi.com/blog/pulumi-agent…
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