@arcnotes

engineering notes about software architecture from your favourite corps by engineers for engineers.

 ☁️
architecturenotes.co/subscribe/
Joined May 2022
  • Tweets1.6K
  • Following1
  • Followers47.3K
348Media
How Relational Databases Work. This post talks about how indexes and transactions work on the inside of relational databases. architecturenotes.co/things-…
22
501
7
2,299
316,300
Architecture Notes retweeted
Mahdi Yusuf
@myusuf3Sep 13
All these Rube Goldberg machines around the models are actually making them way worse. This is both in products and workflows.
1
3
922
Architecture Notes retweeted
Mahdi Yusuf
@myusuf3Aug 5
asking folks to critically think.
5
11
2,306
Architecture Notes retweeted
Mahdi Yusuf
@myusuf3Aug 2
ssh ssh.mahdiyusuf.com check it out.
1
2
4
2,509
Architecture Notes retweeted
Mahdi Yusuf
@myusuf3Jun 21
mahdiyusuf.com/looping-casin…

Looping Casino

Autonomous coding loops excel at search, not judgment. They can optimize toward a goal, but they can’t reliably tell when the goal is wrong. Engineering is still more than iteration speed.

mahdiyusuf.com
3
3
4,218
Architecture Notes retweeted
Mahdi Yusuf
@myusuf3Mar 31
At what point do we stop calling them javascript vulnerabilities and start calling javascript itself a feature-rich remote code execution platform.
4
20
4,030
Architecture Notes retweeted
Mahdi Yusuf
@myusuf3Apr 20
The Speed Tax. mahdiyusuf.com/the-speed-tax…
1
5
1,701
As many of you know every week we send out newsletter and each one has a new image the top each week, this takes a bit of time to design and create with @LumaLabsAI. I am about to produce this in the fraction of the time with tons of artistic control. lumalabs.ai/uni-1
6
1,671
Uni-1 feels like a shift from prompting to actually collaborating. Multimodal + native pixel generation opens up a lot creatively and allows for fast iteration and storytelling accurately. Curious what people build 👀 lumalabs.ai/uni-1

UNI-1 | Less Artificial. More Intelligent. | Luma

Uni-1 is a multimodal reasoning model that can generate pixels. Built on Unified Intelligence, Uni-1 understands intention, responds to direction, and thinks with you. Read technical report to learn...

lumalabs.ai
Luma
@LumaLabsAIMar 23
Uni-1 is here! A new kind of model that thinks and generates pixels simultaneously. Less artificial. More intelligent.
7
2,378
Architecture Notes retweeted
Mahdi Yusuf
@myusuf3Feb 14
America outsourced manufacturing, then the skills to design what gets manufactured. Software is next. mahdiyusuf.com/the-journey-w…

The journey was the point

America outsourced manufacturing, then the skills to design what gets manufactured. Software is next.

mahdiyusuf.com
2
8
2,094
Architecture Notes retweeted
Mahdi Yusuf
@myusuf3Jan 24
I built more with AI agents in two months than the previous year. I used almost none of it. The real productivity gain isn't building—it's using. mahdiyusuf.com/your-agent-is…

Your agent is building things you'll never use

I built more with AI agents in two months than the previous year. I used almost none of it. The real productivity gain isn't building—it's using.

mahdiyusuf.com
1
3
1
28
4,957
Architecture Notes retweeted
Mahdi Yusuf
@myusuf3Jan 15
Why your coding agent keeps undoing your architecture mahdiyusuf.com/why-your-codi…

Why your coding agent keeps undoing your architecture

Think of your codebase as a state machine. The code is the current state. The architectural decisions are the transitions.

mahdiyusuf.com
3
7
2
89
10,003
Architecture Notes retweeted
Mahdi Yusuf
@myusuf3Jan 4
Wrote something about the importance of the code generation and library use in the context of agents. mahdiyusuf.com/agents-didnt-…

Agents didn't kill libraries—they just changed the math

I've been writing software long enough to remember when "don't reinvent the wheel" was gospel. Find a library. Import it. Move on. The assumption was clear: someone else's maintained code beats your...

mahdiyusuf.com
1
2
6
2,545
Architecture Notes retweeted
Architecture Notes@arcnotes30 Oct 2025
Building GenAI infra isn’t theory—it’s hard-won experience. Learn from 60+ engineers who’ve scaled LLMs, vector stores & RAG pipelines at QCon SF 2025. What worked. What failed. What to avoid.
1
3
10
4,471
Architecture Notes Weekly: Trio out now! Why pgvector might not cut it in production How bloom filters fail at scale Why LLMs can’t replace hands-on learning Plus: slashing cloud costs and Postgres as a lakehouse system Join thousands of engineers! Don’t miss out 🚀
1
4
2,491
architecturenotes.co/p/arc-n…

Arc Notes Weekly #103: Trio

This week, why pgvector might not cut it in production, how bloom filters fail at scale, and why LLMs can't replace hands-on learning. Plus, slashing cloud costs and Postgres as a lakehouse system.

architecturenotes.co
2
2,041
Building GenAI infra isn’t theory—it’s hard-won experience. Learn from 60+ engineers who’ve scaled LLMs, vector stores & RAG pipelines at QCon SF 2025. What worked. What failed. What to avoid.
1
3
10
4,471
qconsf.com/?utm_source=archi…

QCon San Francisco 2026: Senior Software Engineering Conference

What's next in AI. What's next in software. 60+ senior practitioners share what's working across AI, architecture, leadership, and culture. November 16-20, 2026, San Francisco.

qconsf.com
1
1
1,585
Architecture Notes Weekly: Generator out now! How AWS serves 1 petabyte per second on old hard drives The 14-hour outage that killed Slack, Signal, and Premier League Building a key-value database from scratch with LSM trees Join thousands of engineers! Don't miss out! 🚀
1
2
8
2,390
architecturenotes.co/p/arc-n…

Arc Notes Weekly #101: Generator

This week, how AWS hits 1 petabyte per second on old HDDs, why a DNS bug killed Slack for 14 hours, and how to build a key-value database from scratch.

architecturenotes.co
2
1,882
Methodologies
11
163
11
917
82,980
Load more