Luca Palmieri

Next Wednesday will be my last day at Mainmatter. I joined as the first Rust hire, with a simple goal: build a world-class consulting team for Rust. 3 years later, Mainmatter is a household name in the space—it wasn't always easy, but I learned a lot during the ride.

Looking for your wisdom folks. I am increasingly interested in: - Better *single-user* tools for PR reviews. - Products to spin up multiple cloud-hosted agents for coding purposes. No need for long-running VMs, ephemeral is good enough. What should I be checking out?

cheadergen, a new tool for generating C headers from #rust crates, is now ready to try! I've been working on it for a while, and it has seen enough real-world use that I'm comfortable recommending it to others. Documentation, examples, and source at cheadergen.com

Underrated agentic workflow: take a messy commit history and slowly rewrite it into atomic revisions that can be reviewed and merged independently. Works beautifully with jujutsu (jj), using a duplicated branch to ensure no destructive changes are made to the original PoC.

Latest occurrence: I'm currently working on a trait redesign which requires touching _every single impl_ in the project (>30). As you work through the impl, you realize some tweaks are needed to the design and start accumulating clean-up commits. It'd suck to review that.

The mainstream conversation around AI agents is stuck on "AI slop." There's more to it: we can use cheap agent code to do quality-raising work that didn't make economic sense before. What's viable now that writing code isn't the primary bottleneck? lpalmieri.com/posts/agenti...

Mainmatter is looking for a Rust backend engineer, either as a full time employee or a freelancer. You'll be working on cloud-native projects, helping clients either adopting Rust or scaling it successfully. If you're interested, send an email to the address in the screenshot!

Less than 10 days left before Rustlab! It's a conference that's close to my heart—one of the first I spoke at, back in 2019! Years have been passed, but the vibe and the community have only improved. Tickets are still available—use `SP20FR` for a last-minute 20% discount.

New Redis release, but with a twist. It includes our first Rust patches to Redis Query Engine! In particular, it ships the new TrieMap implementation I wrote with Henk Oordt, as part of @mainmatter.com's ongoing collaboration with Redis.

We have another opening at Mainmatter, this time for a *technical writer*. You'd be working directly with me on new Rust training material, blog posts and other kinds of technical long-form content. If you're interested, send your resume job AT mainmatter DOT com

Rust 1.89.0 will stabilize let-chains (yay 🎉). In the same release, clippy will flag `if` statements that can be collapsed further using a let-chain. Outcome: your CI will fail when 1.89.0 is released, and you can't fix it ahead of time because the feature clippy wants you to use isn't stable yet 🙃

If you want to mitigate the problem, slap `#![allow(clippy::collapsible_if)]` on your crate.

Rust 1.89.0 will stabilize let-chains (yay 🎉). In the same release, clippy will flag `if` statements that can be collapsed further using a let-chain. Outcome: your CI will fail when 1.89.0 is released, and you can't fix it ahead of time because the feature clippy wants you to use isn't stable yet 🙃

The Rust-Python workshop at @pyconit is about to start! Seek me out if you're at the conference and you want to talk about native extensions!

Two weeks left to submit your talk proposals for EuroRust 2025 ⏳ The CfP closes on June 2nd! We're looking for a wide range of contributions: beginner-friendly talks, reports on Rust industrial usage, deep-dives on language features or crates, tutorials, etc.

In case you were wondering: work on Pavex continues! I'm reworking the public API to minimize friction. We're shifting towards attribute macros for component egistration. This removes the need to spell out raw paths, a major pain point of the first beta version.

It took a few iterations, but the API for sessions in Pavex is _done_. The release includes a guide and two storage implementations (in-memory and Postgres-based). More storage options will follow.