Oliver Azevedo Barnes

Prequelling the next chapter of life.
Rethinking Europe in America.
#newyork

Join our growing #rustlang team – we're hiring for a Rust Consultant (focus on cloud/backends)

www.linkedin.com/jobs/view/43...

Hey everyone, I'm relocating back to New York City, and looking for work in the city or remote across the US and Canada.

I'm especially interested in #AI engineering with #Rust. But also open to API development, my long-time focus with #Ruby and some #Elixir mixed in.

DMs and reposts welcome!

EuroRust 2025 – October 9 & 10, Paris & online EuroRust is a 2 day conference for the European Rust community – October 9 & 10, 2025 – in Paris & online

🦀 Talk by @conradirwin.bsky.social, Software Engineer at @zed.dev

Modern computers are fast, but modern software rarely pushes them to their limit. Conrad will share how Zed’s GPUI can render a new frame to the entire screen every 8ms.

Book your ticket ➡️ eurorust.eu/talks/render...

How to create an MCP server?

In less than a minute you can setup TMCP with your preferred validation library, authentication, SSE+HTTP+STDIO support, using Web Request/Response and even comes with an example server that you can update to your liking.

```
pnpm create tmcp
```

🧡

rcc.im/tmcp

Updated my professional homepage with latest: www.oliverbarnes.dev. Yes, could definitely look better - will put some love into it soon.

Finally got my copy! “AI Engineering” is officially out 🙏 🎉

It’s heavier than I expected (500 pages) and I’m so glad O’Reilly decided to publish it in color.

Thanks everyone for making this happen! Thank you for giving this book a chance!

Common pitfalls when building generative AI applications As we’re still in the early days of building applications with foundation models, it’s normal to make mistakes. This is a quick note with examples of some of the most common pitfalls that I’ve seen, b...

Common pitfalls (with examples) when building AI applications, both from public case studies and my personal experience.

huyenchip.com/2025/01/16/a...

Would love to hear from your experience about the pitfalls you've seen!

The up side of down time is getting to work daily on my pick of open source projects, during my most productive hours. | Oliver Azevedo Barnes The up side of down time is getting to work daily on my pick of open source projects, during my most productive hours. Practicing and studying the stuff I'm most curious about, and which I'm betting w...

My latest blog post... on Linkedin: www.linkedin.com/feed/update/...

On working on OSS projects while looking for paid work.

ratomic - Ractor-safe mutable data structures for Ruby https://github.com/mperham/ratomic

Know Rust or C extensions? Help us expand the APIs and improve the native gem builds.

https://github.com/mperham/ratomic/issues

Rust Support Subscription | A Direct line to Mainmatter's experts - Mainmatter Reach our team on Slack and get 2h of dedicated time per week – whether you need a quick gut check, a deep code review, or a hands-on pairing session, we’re here to help

Sign up for our Rust Support Subscription 🦀🤝

Get instant access to our #rustlang experts: whether you need a quick gut check, a deep code review, or a hands-on pairing session, we’re here to help.

➡️ mainmatter.com/rust-subscri...

1/🧵

RSVP for Rust Munich Meetup is NOW OPEN! If you want to attend in person at Mainmatter’s Munich office, grab your spot before it’s gone!

No worries if you can’t make it—we’re live-streaming the event too! Get the access here ➡️ www.meetup.com/rust-munich/...

#rustmunich #rustlang

Sidekiq's metrics view

Sidekiq 8.0 is now available, with easy Job Profiling and a refreshed Web UI. Read more:

www.mikeperham.com/2025/03/05/i...

Today has been great for the Ember Initiative 🐹 And I wanted to share why in a quick 🧵

I'm pretty happy to have @discourse.org as a backer at a tier that allows us to have a 2 hour pairing session every week. We can use this time to work on anything even tangentially related to the Initiative.

Early Bird Tickets are LIVE! 🎟️

#eurorust25 is coming to Paris & online on October 9–10, 2025—and now’s your chance to grab your spot at the best price! 🦀

Limited early bird tickets are available, so act fast! ➡️ eurorust.eu

EuroRust 2025 is coming to Paris 🦀🇫🇷 Rustaceans, mark your calendars!

📍 Paris, France & Online
📅 October 9–10, 2025

Join us for two days of #rustlang talks, hands-on workshops, and community connection—whether in person or remotely. Ticket sales and Cfp now open!

➡️ eurorust.eu

#eurorust25

eserde: Don't stop at the first deserialization error - Mainmatter `eserde` can be used to collect multiple deserialization errors, rather than stopping at the first one. They can then be reported to the user at once, improving the developer experience for API consum...

New Rust crate alert: eserde! 🦀

Tired of getting just one error at a time when deserializing with `serde`? `eserde` (built on top of `serde`) reports multiple errors at once, making API debugging way smoother.

Read @lpalmieri.com ’s piece here ➡️ mainmatter.com/blog/2025/02...

Making Your Web Application Compliant With the European Accessibility Act - Mainmatter Why making your digital product comply with the European Accessibility Act by June 2025 requires web engineering expertise.

The European Accessibility Act (EAA) deadline is coming fast—June 2025. If your web app isn’t accessible, it could mean fines and lost users.

Good news: compliance isn’t just a legal checkbox—it makes your product better for everyone. Gabor Babicz breaks down what you need to do ➡️

Our Rust expert Henk Oordt will be at @devworldconference.bsky.social in Amsterdam, running the “100 Exercises to Learn Rust” workshop—a hands-on intro for programmers new to Rust. 🦀

Look into the details here ➡️ https://devworldconference.com/program

#rustlang #learnrust #DevWorldConference

Flipper 1.3.3 Dearest feature flagger, I come today bearing good news. A new year and a new release! Only a patch, but it's got some nice bug fixes and other treats. Redis Connection Pools Let's lead with the 🔥. I'm happy to report that the redis and redis cache adapters now work with

Flipper 1.3.3 is out -- redis connection pools, UI escaping fixes and a couple Cloud fixes.

blog.flippercloud.io/flipper-1-3-3/

I got quite a lot of free time lately, so I figured I'd use it to blog a bit. Hopefully it's worth the effort?

Here's the first one, about some of the optimizations I and others made to ruby/json recently: byroot.github.io/ruby/json/20...

Since the first post was well received, that motivated me to continue, let's see how long it lasts byroot.github.io/ruby/json/20...

🦀 This workshop is one of our most demanded trainings. See what previous attendees said. Sign up here for the next open workshop in January ➡️ https://ti.to/mainmatter/rust-testing-jan-2025

and drop us a message! 😊

#rustlang #workshop #techworkshop #programmingworkshop

Seems obvious, right - git messages describing WHY something is being committed in the first place. Maybe “message”and “description” are misleading. Should just be “why?”. And then we could simply go - git why sha

In Ruby 3.4, you'll start seeing warnings about frozen string literals.

If you still need mutable strings, create a new String object instead of using the literal syntax.

String literals will work like symbols where they point to the same object in memory which is great for performance.

GitHub - jnunemaker/httparty: :tada: Makes http fun again! :tada: Makes http fun again! Contribute to jnunemaker/httparty development by creating an account on GitHub.

Choose 20 Ruby gems that you've used time and time again, or have inspired you in some way.

One gem per day for 20 days, in no particular order.

No explanations, no reviews, just README links. (1/20)

github.com/jnunemaker/h... by @johnnunemaker.com

Gerust is pretty cool, a lightweight framework (built on top of axum) that'll give you some sane defaults for an API app in Rust.

I've been using it for an internal project while working with @mainmatter.com, and beginning to contribute to it.

Interesting ride, coming from Rails and Phoenix ;)

if you have a @github.com profile, can i ask you to update it with your @bsky.app handle? 🙏

👉 it enables some very cool integrations, like auto curated feeds and starter packs for contributors and tech

Rails 8.0 hasn't even been out 24 hours and we're already running it in production at Zendesk. Tens of thousands of subdomains now powered by Rails 8.0. Just another humble entry into the "Does Ruby/Rails scale?" conversation. 💎🚆 #ruby #rails

Cache parsed object names by byroot · Pull Request #675 · ruby/json Looking up the fstring table isn't that cheap, if we assume most object names are likely to re-appear, it makes sense to keep a small cache of them on the stack. e.g. [{"foo": 1, &quo...

I never thought I'd have to write a binary search function after I finished school.
github.com/ruby/json/pu...