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David Calavera

@calavera.dev
950 followers 344 following 333 posts

I enjoy reading lots of books, and building open source tools for 🦀 developers. I hope you like dogs.

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David Calavera @calavera.dev · 17/08/2026
really cool stuff that the @tensorlake.ai team has been up to while I was on vacation: lnkd.in/p/geukZ58C
lnkd.in
First look at Tensorlake GPUs! Sub-200ms startup time for GPU containers and supports dynamic allocation by GPU model name and device count. We support full memory and CUDA snapshots to load models… |...
First look at Tensorlake GPUs! Sub-200ms startup time for GPU containers and supports dynamic allocation by GPU model name and device count. We support full memory and CUDA snapshots to load models an...
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David Calavera @calavera.dev · 09/08/2026
I went to Canada to photograph orcas, and all I got was a dick pic
A male orca breaching water with his belly up. His reproductive organ clearly visible.
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David Calavera @calavera.dev · 22/07/2026
where do I need to sign for this deal?
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David Calavera @calavera.dev · 07/07/2026
always read the footnotes: "Yes, a curve. Yes, your boss lied to you when you asked if there was a curve, and he talked for a while about fairness, but there’s a curve. Always."
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rands @rands.bsky.social · 04/07/2026
The Worry Police are still in the room. Still worrying. Let them watch you lead: randsinrepose.com/archives/the...
randsinrepose.com
The Worry Police
The Worry Police worry. During their career, the Worry Police were rewarded amply for their worrying, so they believe it's their move. It makes them feel impor
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David Calavera @calavera.dev · 28/05/2026
I've been screening candidates for a couple of open positions we have at Tensorlake and I'm amaze at the number of fake resumes we receive. I've jumped in several screen calls where candidates just drop off the call when I asked them for proof of identification 🤷‍♂️
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David Calavera @calavera.dev · 24/04/2026
I wrote a blog post about sandboxes, schedulers, and how we're scaling our infrastructure at @tensorlake.ai. Go check it out! www.tensorlake.ai/blog/startin...
tensorlake.ai
Starting hundreds of sandboxes in parallel, and the design that makes it possible.
A 1,000-sandbox evaluation harness doesn't care about your reconciliation loop. We replaced ours with a durable command outbox — and sandboxes stopped waiting in line.
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David Calavera @calavera.dev · 16/04/2026
coding agent: The run succeeded. All 42 tests across the 8 test classes passed in 3m11s. commit that made tests pass: Skip test in local CI
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Mary Branscombe @marypcbuk.bsky.social · 31/03/2026
the reason we have this platform at all, or smartphones or modern CPUs or half the things you rely on online is because of trans people and we need to work harder at protecting and uplifting them and not supporting transphobe platforms, people and politicians
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David Calavera @calavera.dev · 29/03/2026
I guess this is a good time to bring this old blog post back: www.kalzumeus.com/2010/06/17/f...
A form with my last name, which includes a blank space between two words because that’s what spanish last names look like, and an error message that says “The last name field allows only letters and the following characters (-) and must begin and end with a letter”
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Zane Schacht - Voice Goblin @voicesbyzane.bsky.social · 25/03/2026
Fuck Harry Potter just read discworld. It's a fantastical world of magical creatures and adventure but the author has class consciousness and knows how to write comedy that isn't just making fun of how fat a character is
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David Calavera @calavera.dev · 25/03/2026
Nothing like a divorce to make you reconsider all those cables you’ve been hoarding for two decades. Will I ever need 5 hdmi cables in my new 1 bedroom apartment? 🧐
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David Calavera @calavera.dev · 20/03/2026
I have an alias in my terminal called danger-claude
media.tenor.com
a man in a suit and tie is standing in front of a painting .
ALT: a man in a suit and tie is standing in front of a painting .
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Phil Hawksworth @philhawksworth.dev · 17/03/2026
Yesterday was my last day at Deno. From today, I'll be cheering the talented team on from outside the org. This also means that I'm now considering my next move in the DX/DevRel/Technical marketing space.
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David Calavera @calavera.dev · 12/03/2026
we're reach the state of every company when you need to have the talk about `ah-mi` vs `eh-em-ai`
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David Calavera @calavera.dev · 09/03/2026
Me to claude: Write a gha workflow to do this very specific thing Claude: done Me again: Review your changes looking for things that won’t work on gha Claude: ugh, yeah, these things won’t work If the machines cannot write gha functional workflows at first try, what chance do we mere mortals have?
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David Calavera @calavera.dev · 05/03/2026
I don’t have a stomach nor an esophagus
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David Calavera @calavera.dev · 26/02/2026
I completely forgot that we hired @rafa.design at Netlify after he slid into my twitter dms almost a decade ago now. ”Maybe I can help” is probably the understatement of the decade.
A screenshot from a twitter dm email notification from @rafa.design to me on May 2, 2016. The message says “Just checking in, love the product, maybe I can help”
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Anil Madhavapeddy @anil.recoil.org · 24/02/2026
Made the cover of @acm.org with "A Decade of Docker Containers", recapping much systems work! Docker grew so fast in those early days that we never got a chance to write an academic paper about it, so this has been a long time coming cacm.acm.org/research/a-d... w/ @justincormack.bsky.social djs55
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David Crawshaw @crawshaw.io · 22/02/2026
Idle thoughts on how to communicate in the ongoing marketing catastrophe, with an example showing how you can write software on your phone. blog.exe.dev/show-dont-tell
blog.exe.dev
Show, don’t tell - exe.dev blog
On the perils of marketing, and writing private apps from your phone.
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David Calavera @calavera.dev · 17/02/2026
your under-provisioned and poorly configured CI system is staring down at you and laughing at your "AI productivity gains"
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David Calavera @calavera.dev · 14/02/2026
I have a really hard time understanding how a website can go downhill so quick that not even the most basic things that have been working for 15 years work anymore
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David Calavera @calavera.dev · 23/01/2026
This is good read about the state of open source and AI. Unfortunately, I'm skeptic about GitHub doing something to make things better. So far, their latest changes in PRs, splitting large PRs in one page per file(WTF), make reviewing code generated by AI worse, no better 🤷‍♂️
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David Calavera @calavera.dev · 02/01/2026
Kona doing her best @firefox.com impersonation
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David Calavera @calavera.dev · 30/12/2025
When I maintained the Rust runtime for AWS Lambda, trying to cross-compile OpenSSL because it's the default tls backend in reqwest was the top issue for people starting with the runtime. I'm very happy that I was able to provide a little bit of help to remove that category of problems all together.
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Sean McArthur @seanmonstar.com · 30/12/2025
To end the year, a new major version of #rustlang reqwest, v0.13.0 is out! 🚀 - This brings rustls by default, replacing native-tls. 🦀 - Some feature and method cleanup. - But easy to upgrade for most everyone. seanmonstar.com/blog/reqwest...
seanmonstar.com
reqwest v0.13 - rustls by default
reqwest v0.13 brings rustls by default, feature cleanup, but otherwise easy to upgrade.
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Sean McArthur @seanmonstar.com · 23/12/2025
Just published a new #rustlang reqwest release candidate: v0.13.0-rc.1. This has some breaking changes, the biggest was switching to rustls by default. I'd appreciate if you gave it a spin 🙏 github.com/seanmonstar/...
github.com
Release v0.13.0-rc.1 · seanmonstar/reqwest
👀 Discussion here if you give it try, thanks! Main breaking changes rustls is now default instead of native-tls rustls provider defaults to aws-lc instead of ring (rustls-no-provider exists if you...
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Servo @servo.org · 23/12/2025
We have built a self-hosted runner system that does virtual machine orchestration under the hood, cutting our CI times by 50-90%, all for barely 400 EUR/month! Delan Azabani explains it all in her talk: www.youtube.com/watch?v=-W1m... Transcript and slides: www.azabani.com/2025/12/18/s...
youtube.com
Web engine CI on a Shoestring Budget
YouTube video by Igalia
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David Calavera @calavera.dev · 19/12/2025
I hadn’t done a dog photoshoot in a while. Our neighbor Nova is a spunky little Australian shepherd pup that cannot stay put for more than 5 seconds.
Tri-color Australian shepherd dog wearing an orange bow-tie. The background is baby blue.Tri-color Australian shepherd dog wearing an orange bow-tie. The background is baby blue.Tri-color Australian shepherd dog wearing an orange bow-tie. The background is baby blue.Tri-color Australian shepherd dog wearing an orange bow-tie. The background is baby blue.
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David Calavera @calavera.dev · 28/11/2025
It was all fun and games until the diarrhea happened
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Mike Heffner @mike.heffner.io · 22/11/2025
Congrats! If you're working with OpenTelemetry in Lambda, this may be interesting: github.com/streamfold/r.... Rust OTel collection with very fast cold start times.
github.com
GitHub - streamfold/rotel-lambda-extension: AWS Lambda Extension for Rotel
AWS Lambda Extension for Rotel. Contribute to streamfold/rotel-lambda-extension development by creating an account on GitHub.
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James Eastham @jameseastham.co.uk · 22/11/2025
Rust on AWS Lambda is now GA 🎉🎉 To celebrate @loige.co and me put together a short newsletter and talked about what's next for the next two chapters of the Rust on Lambda book. And some details on the next release.... news.rust-lambda.com/p/from-exper... #serverless #rust #rustlang
news.rust-lambda.com
🦀 From Experimental to GA: Rust on Lambda and Our Road Ahead
The Rust Lambda runtime just hit 1.0 and GA 🚀 We break down what that really means (no, it’s not a managed runtime), share progress on our event-driven chapter + observability, and tease the next big ...
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David Calavera @calavera.dev · 15/11/2025
AWS has promoted the Rust runtime for AWS Lambda from experimental to GA. Not much has changed in the runtime, but their customers will have official support from the company. I’m glad it finally happened, but it’s still a bittersweet moment for me: aws.amazon.com/blogs/comput...
aws.amazon.com
Building serverless applications with Rust on AWS Lambda | Amazon Web Services
Today, AWS Lambda is promoting Rust support from Experimental to Generally Available. This means you can now use Rust to build business-critical serverless applications, backed by AWS Support and the ...
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David Calavera @calavera.dev · 08/11/2025
Sirius, one of my favorite dogs at the shelter, got a room upgrade. Now he just needs a house upgrade.
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David Calavera @calavera.dev · 07/11/2025
Sneak preview of @tensorlake.ai's agents runtime. A new durable, parallel and isolated execution model for deep research agents. Text this number with a financial research question to see it in action - +1-217-601-5252! We're currently in private beta. I can't wait to make it GA!
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David Calavera @calavera.dev · 05/11/2025
this is what we do for “fun”
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David Calavera @calavera.dev · 01/11/2025
meet Mahogany, a 1yo pit-mix living at the Placer Animal Services facility. He’s as fun as he’s graceful
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Xuanwo @xuanwo.io · 29/10/2025
For everyone interested in data infra, want to get a quick sense of how big data works, how data systems are designed, and what the tradeoffs are, start with this share from @xiangpeng.systems, really nice intro! intro-data-system.xiangpeng.systems
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Tensorlake @tensorlake.ai · 23/10/2025
Want to build scalable data lakes w/ Tensorlake + @qdrant.bsky.social? In the free Qdrant Essentials Course, learn how to: - Architect vector-powered data lakes - Optimize ETL pipelines - Create knowledge graphs - Integrate @langchain.bsky.social agents for natural language queries t.co/OoPZswrL7z
Promotional banner for the Qdrant Essentials Course featuring Tensorlake. Text reads: ‘Improve collection querying with knowledge graphs.’ On the left is the Qdrant logo and course title; on the right is a smiling woman with long curly brown hair wearing a cream-colored top, set against a purple gradient grid background.
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David Calavera @calavera.dev · 14/10/2025
The company I work for, @tensorlake.ai, is hiring a couple of roles remote within the US: tensorlake.ai/careers You might be a great fit if you like working with Rust, Python, K8s, me?, and you enjoy building products for developers.
tensorlake.ai
Tensorlake
Transform Data Into Knowledege
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David Calavera @calavera.dev · 12/10/2025
this is just rude
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David Calavera @calavera.dev · 02/10/2025
Anthropic owes me money, yay!
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David Calavera @calavera.dev · 28/09/2025
Me: I’m not sure if we should add this feature, it might confuse customers. Me, five minutes later: oh, I just checked the code and I actually implemented it three days ago. I completely forgot about that.
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David Calavera @calavera.dev · 27/09/2025
Enjoy Benji in slow-mo
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David Calavera @calavera.dev · 27/09/2025
This was the welcome committee at the shelter this morning
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David Calavera @calavera.dev · 25/09/2025
I’ve spent the last two weeks deleting a bunch of code someone wrote with Claude Code. Guess how I feel about coding agents these days.
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David Calavera @calavera.dev · 20/09/2025
Oh, no, I got puppy fever!
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David Calavera @calavera.dev · 18/09/2025
I can understand using AI coding tools to help with with work, what I cannot understand is AI generated code with 0 tests. Like how did you manage to do that? Any coding tool these days will spit an ungodly amount of tests whether you like it or not
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Bryan Cantrill @bcantrill.bsky.social · 18/09/2025
Last week, we were treated to an extraordinary talk internally at @oxide.computer. It was at once an expository talk of a complicated software system and an experience talk of developing systems software in the large -- and it was far too good to keep to ourselves! oxide.computer/blog/systems...
oxide.computer
Systems Software in the Large / Oxide
An extraordinary talk on developing systems software in the large
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