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Juan Castillo

@0x5d.bsky.social

Software engineer. Go, Rust, infra. TL, Platform @ mercadolibre.com. Prev. Cloud @ Redpanda.

34 Followers  |  71 Following  |  67 Posts  |  Joined: 01.06.2023  |  1.5797

Latest posts by 0x5d.bsky.social on Bluesky

This post makes me feel like it’s 2015 and I love it.

11.08.2025 00:36 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Preview
On agency Or, how to handle being sentenced to freedom, and handle it effectively, and authentically, and responsibly

Beautiful essay by @henrikkarlsson.bsky.social on learning to realise that what you want to do is, in fact, possible www.henrikkarlsson.xyz/p/agency

07.07.2025 12:33 β€” πŸ‘ 53    πŸ” 6    πŸ’¬ 6    πŸ“Œ 1

Blindsight

04.07.2025 18:52 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Je m’alloc

22.06.2025 11:59 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

This applies to life in general, now that I think about it.

14.06.2025 19:20 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The game is more fun if you commit to the bit. But also: sometimes the β€œwrong” option turns out to be the best choice.

14.06.2025 10:58 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 0    πŸ“Œ 1

hope
springs
Γ¦ternal

12.06.2025 01:20 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Copilot adds β€œnitpick” comments on PR reviews, therefore confirming my hunch that we have reached AGI (it is now indistinguishable from an unengaged engineer with bad communication skills).

03.06.2025 13:57 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I agree with Mehdi that I think we’re moving into a world that incentivizes smaller orgs and teams. You can do so much with very few engineers today

I don’t think I buy the argument that mid-sized companies are dying though. You’ll still need to scale up eventually, just later

01.06.2025 18:45 β€” πŸ‘ 2    πŸ” 1    πŸ’¬ 3    πŸ“Œ 0

Or very strong magnets!

19.05.2025 00:00 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

10 pages a day, ~1 book a month. By the end of the year you’ll be 12 books ahead of the average.

18.05.2025 23:59 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Card art for Magic: the Gathering β€œDeath’s Shadow”

Card art for Magic: the Gathering β€œDeath’s Shadow”

Cover art for Witch Vomit β€œFuneral Sanctum”

Cover art for Witch Vomit β€œFuneral Sanctum”

Poster art for β€œArmy of Darkness”

Poster art for β€œArmy of Darkness”

Poster art for Metallica

Poster art for Metallica

This is the official account for Matt Stikker, illustrator based in Portland, OR. Horror, fantasy & heavy metal art in ink & paint, and sometimes pixels. Past & present clients include Magic: the Gathering, Lurking Class, Metallica, Santa Cruz, more. I’m on IG @bargainbinblasphemy, but call me Matt

30.11.2024 19:27 β€” πŸ‘ 126    πŸ” 13    πŸ’¬ 3    πŸ“Œ 1

The world is going through some shitty stuff, but it’s so weird to see US people post about it on here all the time.
As far as I can see, everyone who sees your posts agrees with them, so what’s the point?
And even if they didn’t - I’ve never seen anyone change their minds because they read a tweet.

12.03.2025 16:03 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

❀️

09.03.2025 12:18 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
HYTRADBOI 2025 HYTRADBOI is a fun online conference about databases, programming languages, and everything in between.

See y’all at @hytradboi.bsky.social ! Get your tix at www.hytradboi.com/2025

28.02.2025 03:24 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I was reading and annotating the Viewstamped Replication Revisited paper, and all of a sudden, Preview (on Mac) seems to have flushed all my notes down the toilet.
What are some good apps to read papers on? #pwl #ismacosthenewwindows #distsys

25.02.2025 23:25 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

It’s hard to make a pretty diagram of a complex system.

24.02.2025 21:12 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

People focus a lot on the law of diminishing returns, and not enough in the law of noob gains: when you have nothing (incl. knowledge), gaining anything is a ∞% delta.

24.02.2025 01:48 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Way higher

17.02.2025 20:31 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Gut feeling: if you have a big enough distributed system, and you aren’t using Kafka, you’re reinventing it.

17.02.2025 18:30 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Going through my private repos and apparently I tried to write a book about DevOps 9 yrs ago.
Yikes.

16.02.2025 02:24 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

If you can estimate accurately how long it would take you to make something, leave it to an LLM and find something valuable to focus on instead.

15.02.2025 02:45 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The thing about software eng is that, unlike some other professions, many people get into this for fun. It's all about play and curiosity.
If you're just "working", people that are playing are gonna leave you behind in the time it takes to flip a bit.

02.02.2025 23:24 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Easy Rich Hickey’s β€œSimple Made Easy” is one of the best talks I’ve ever seen. I watched it again recently, after 8 years, but now the part that stood out was the section where he goes into the etymology o...

On the word "easy" and getting closer to the things you want to know by taking detours. blog.0x5d.io/posts/easy/

28.01.2025 03:02 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
mixu.net

Randomly thought about Mikito Takada (mixu.net) and his dist-sys book. It was so cool and concise, and such a great gateway into that world.

27.01.2025 21:36 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The main reason is honestly how much thought seems to go into how everything fits together. The language just feels consistent.
I’m looking forward to diving deeper after so many years!
❀️

27.01.2025 14:05 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Been watching @richhickey.bsky.social's talks again and I think I'm gonna just throw it all away and find a home in Clojure and @jeaye.bsky.social's Jank. Clojure is beautiful, there are no _cons_.

26.01.2025 23:10 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Preview
a cartoon character giving an ok sign with his hand ALT: a cartoon character giving an ok sign with his hand
26.01.2025 11:09 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Haha which one is that?

25.01.2025 00:00 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

It really is. I should have read it all those years ago when you recommended it to me!

24.01.2025 12:33 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

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