System Architecture

Stop blaming CORS. Learn how Same-Origin Policy and CORS actually work together, understand simple vs non-simple requests, and debug CORS issues step by step.

codeToC4 by Uxxu reads your Git repo and generates up-to-date C4 architecture diagrams automatically. See architecture by commit, branch, and diff.

How the smartphone transformed digital identity—through biometrics, surveillance capitalism, FIDO's password killer, and the birth of virtual identity

Personal home page of Tony

Most people think an email address is just a username and a domain. It is a lot more than that. This covers structure, rule, edge case, and security trap worth knowing about.

iSCSI was designed for the SAN inside a rack, not the open internet. Here's the pile of small decisions that makes scsipub work anyway — Ranch 2.x listeners, a BEAM process per session, COW overlays, Caddy-terminated TLS, multi-LUN + SCSI-3 Persistent Reservations for cluster software, and a handful of open-iscsi quirks that cost us a day each.

Web developers are moving away from the library wars and into a world of architectural choice. It’s about where you want the data to live.

Ever wondered why your “clean” polymorphic design underperforms in benchmarks? Virtual dispatch enables polymorphism, but it comes with hidden …

Django already knows every model in your project, every field, every relationship — down to the last on_delete. So why are you drawing it by hand?

Apple's original Human Interface Guidelines laid out Apple's vision for a set of consistent approaches for GUI applications. Even though Windows ended up with a different set than the Mac, the idea was simple and profound: create a consistent set of user expectations for all...

We built ten domain-expert subagents to manage context when working on Metabase's 500K+ line backend.

This blog post is meant to help my friends get started in reading my other blog posts, that is, this post is a crash course on the notation ...

dependency-based init system for UNIX-like operating systems

Discussion on notions of software complexity as defined by Rich Hickey, John Ousterhout and Zach Tellman.

normalizing a database design to reduce the duplication of data and ensure referential integrity

Something I didn't understand for a while is that the process of turning row-oriented data into column-oriented data isn't a totally bespoke, foreign concept...

Reconstructing a Dead USB Protocol: A Handheld's Secrets Unlocked by a Hot Knife -- A multi-disciplinary journey to reviving a forgotten USB interface - coremaze/ME2-Writeup

Transform Linux protection with real prevention capabilities

Today, our internal observability system watches 6 regions, ingesting 21 billion metric points, 14 TB of logs, and 10 TB. The story of how we got here starts with everything falling apart.

So it was that time of the quarter when our team was close to shipping a new service to production.

A couple of years ago, I wrote that The Builder pattern is a finite state machine!. A state machine consists of states and transitions between them. As a developer, I want to make illegal states unrepresentable, i.e., users of my API can’t create non-existent transitions. My hypothesis is that only a static typing system allows this at compile-time. Dynamic typing systems rely on runtime validation. In this blog post, I will show that it holds true, with a caveat.

In a Moon uses the subject instead of DIDs and here is why

Event-Driven by Oskar Dudycz

Explore how Shazam and song identification work through interactive visualizations — spectrograms, constellation maps, hash fingerprints, and time-offset matching.

We usually think branching means copying the whole database. With copy-on-write, it doesn't. Let's compare workflows like seeding to DB branching.

Introducing ggsql, a grammar of graphics for SQL that lets you describe visualizations directly inside SQL queries.

Small programs are supposed to be simple, that’s kind of the whole point of them being small.

An MIT-licensed, Prometheus-compatible timeseries database built on SlateDB, bringing the operating model and cost structure of object-store-native systems to the Prometheus and Grafana ecosystem.

In most modern systems, clients rarely communicate directly with backend servers. Instead, an intermediate component is introduced to manage communication, e...

Modern tooling for parsing, searching, formatting, editing R code, just like for other programming languages.