Sam Reis

Building programmable, open source git infrastructure at

[Sam Reis @periping]

We just built the most scalable Git server out there: 7,600+ concurrent pushes/s per repo at millisecond latency.

Powered by Raft and S3, designed like a modern database.

Today we're making it open source by releasing Enroute 0.3.0.

Read the write-up: https://t.co/y9W7YLN148

[Sam Reis @periping]

This is 💯% the thesis we have at @enroute_sh.

The companies of the future will be made out of code; small apps, scripts, the remotion project that generates your next slide deck.

And we need the infra that supports it at that scale.

[MTS @MTSlive]

Notion AI lead @sarahmsachs argues that a lot of what runs on GPUs today should actually run on CPUs:

"We have a strong perspective at Notion that a lot of things should be served on CPU that are served on GPU. There’s a lot of benefit and determinism in executed code."

"Agents don’t need LLMs to reinvent that process every time, and that’s super token exhaustive, it’s super slow, and there’s no observability or determinism in it."

"Giving the agent a local file system to store local thoughts, to write short Python scripts, that’s really important when there’s so much information. That has been probably one of the most important tools outside of edit and search that our internal agents rely on."
@NotionHQ

[Sam Reis @periping]

@haukejung Besides it being open source, it‘s also just Git! So all you existing tools keep working. Why switch away from Git if we can make it work just as well?

[Sam Reis @periping]

We just built the most scalable Git server out there: 7,600+ concurrent pushes/s per repo at millisecond latency.

Powered by Raft and S3, designed like a modern database.

Today we're making it open source by releasing Enroute 0.3.0.

Read the write-up: https://t.co/y9W7YLN148

[Sam Reis @periping]

@aladicf Railway buckets should just work out of the box. Give it a shot!

[Sam Reis @periping]

@FlooWerner @enroute_sh Indeed!

[Sam Reis @periping]

Great to see more people thinking about bring distsys techniques to scaling git on the server.

We have been working on our own version of this, will release soon. Stay tuned for the blog post!

[GitHub @github]

Git activity more than doubled between September 2025 and August 2026, reaching 473.3B events per month.

We’re rebuilding our Git infrastructure while GitHub keeps running, creating a foundation for agent-scale software development. https://t.co/H5J2qxCqMT

[Malte Ubl @cramforce]

We are verification engineers now. With the cost of code going down, we have to reassess the trade-offs of technologies that make coding relatively more expensive but increase robustness.

What might have been too much of a hassle in practice in the past, is now worth it.

We've since undertaken the mission to make IDOR bugs much less likely on our platform using proofs enforced by the typesystem.

[Sam Reis @periping]

Turns out, you _can_ scale git repository hosting surprisingly well... but putting the WAL in S3 is not the way. This is a single repo btw.

[Sam Reis @periping]

Happy to be included in the September release of Gitoxide 🚀

https://t.co/alpv5TTEvF

[Sam Reis @periping]

@anurag_629 Btw, not just the Rust hasher has that inefficiency. Same goes for sha-1 impls currently in Git, Mercurial, etc.

[Sam Reis @periping]

Fast git packfile verification coming to #gitoxide.

https://t.co/xaRZN8Har1

[Sam Reis @periping]

I just wrote a new collision-detecting SHA-1 hasher in Rust that runs almost 3x as fast as existing options thanks to SIMD and which can 2x+ the performance of git pack verification.

It's on https://t.co/HnMMYWHl94 as sha1dc.

Check out https://t.co/LrGF6387GT for how it works!

[Carl Lerche @carllerche]

If you work with Tokio, this is a must read: "Principles for fast Tokio applications" https://t.co/70FjZfc6SR

[Sam Reis @periping]

Effect systems in the frontend coming back about a decade after PureScript definitely wasn’t on my bingo card, but it sure is interesting to see how coding with LLMs is shifting trade-offs. Feel like the same is happening with Rust and Nix, curious what’s next.

[ThePrimeagen @ThePrimeagen]

@zeeg @matteocollina I am getting on the effect train.

Being able to track what errors can happen and if they are all handled is something that I am sure you can eventually get an LLM to do, or you can do it in less than a second and it's 100% reproducible.

[Sam Reis @periping]

My gearhash crate is now pulling 10-20k downloads a day, thanks to powering @huggingface's Xet client, so it felt about time to revisit the code.

Just published v0.1.4: ~2× faster on ARM64 🚀.

Check out this post for the fun details of how it got there:

https://t.co/aLBbD3W13P

[Sam Reis @periping]

Me: Asking for a custom favicon.

Claude, 30 seconds later: "I wrote a small pure-Python PNG decoder/encoder in the scratchpad to do it."

Just crazy how much we're taking for granted these days.

[Sam Reis @periping]

This 💯. Almost all my direct effort on code reviews and building guardrails is currently going into keeping complexity contained.

[Steve Yegge @Steve_Yegge]

All models, no matter how smart, will eventually build systems that they can no longer understand or maintain, if you let them. Fable 5 finally outbuilt itself, and flailed on me for a week. Fable 5.1 looks like it will fix it. For now. But you have to keep an iron grip on system size, or it'll run away from you.

[Jaana Dogan ヤナ ドガン @rakyll]

✨ Wrote about building and growing Internet services with feature boundaries, data autonomy, cell-based architectures, service dependencies, graceful degradation, unique identifiers, idempotency, SLOs and quotas, and observability. https://t.co/Qt8uEvNrij

[Sascha "GSD" Reuter @sreuter]

We’re brewing something hot 🧙‍♂️🔥 ..

> “Allow your users, team & 3rd party developers to extend your product’s functionality + integrations in minutes. 🚀”

Let me know if this sounds interesting and I’ll get you on our “secret” early access list 😎 First come first serve. 🍦🍫🍬

[ірина @_lrlna]

I had so much fun giving my talk about apollo-rs and its compiler! Thank you so much for having me #rustconf.

(It's been a while since I've done this, but!!!) here are my slides ✨

https://t.co/wspWwhHjzu