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HTML over WebSockets: real-time SPAs with barely any JavaScript
Building a SPA (Single-page Application) is a complex puzzle: a JavaScript framework that draws the view, an API serving JSON, and 2 independent…
Topics /
Software Engineering
The most popular blog posts about software engineering on Hacker News. 966 posts.
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Fable 5 vs. GPT-5.6 Sol on an NP-Hard Problem: Does /goal help?
I gave Claude Fable 5 and GPT-5.6 Sol the same unpublished NP-hard optimization problem, with and without their native /goal mode. Fable 5 is a beast; /goal is not a game changer.
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What async promised and what it delivered
The async/await saga is a story where each chapter solves the previous chapter's worst problem while introducing new structural costs. The sequential syntax that made async code readable also obscures the thing that matters: which operations actually depend on each other.
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SQLite as a Document Database (2020)
However recently it added a killer feature: generated columns . (This was added in 3.31.0, released 2020-01-22.)
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First steps in bare-metal programming using UEFI
A series of articles about bare-metal programming for x86 PC-type computers, using Linux for development.
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Reverse Engineering Unknown File Formats with ImHex
An Introduction to File Formats and ImHex by Reverse Engineering FEZ's Save File Format
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Reversing Factorio's RNG
This post details how Factorio's random number generation works, how it can be reversed and how I used that knowledge to predict and manipulate the RNG with pure in‑game mechanics.
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Porting 100k lines from TypeScript to Rust using Claude Code in a month
I read this post “Our strategy is to combine AI and Algorithms to rewrite Microsoft’s largest codebases [from C++ to Rust]. Our North Star is ‘1 engineer, 1 month, 1 million lines of code.” and it got me curious, how difficult is it really?
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The art and engineering of Sega CD Silpheed
The 90's was a decade of considerable improvement in the world of video-game consoles [1] . Each new model brought advanced processing power and better graphics without compromise.
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The tilde in your PATH may not be your HOME
I was playing with the nono agent sandboxing tool and it greeted me with a warning: PATH entries the sandbox can write to: ~/.local/bin/ which looked suspicious.
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Who is vfmaddrnd231pd?
vfmaddrnd231pd is a unique instruction from the FMA instruction set. Most instructions in that set have mnemonics like vfmadd231pd, but here rnd means something very specific. The Intel Software Development Manual documents it as: VFMADDRND231PD – Fused Multiply-Add of Packed Double-Precision Floating-Point Values…
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Forging a Microsoft Edge Full Chain with Logic Bugs Only
This is what I built for Pwn2Own Berlin 2026 — a completely handmade, logic-only Microsoft Edge Full Chain, with no memory corruption, and no AI at all! 🔥
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Hosting a website on an 8-bit microcontroller
My victim is the AVR64DD32 which is quite similar to the Atmega328 of Arduino fame. Compared to the older Atmega, these AVR DD lines are cheaper for the same memory, use a single programming pin and have nicer peripherals:
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C++ std::move doesn't move anything: A deep dive into Value Categories
Why std::move is just a cast, how it kills RVO if used wrong, and the mechanics of ownership transfer.
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Why I forked httpx
I forked the python library httpx to httpxyz after over a year without a release of this popular package
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Stories from 25 Years of Software Development
Last year, I completed 20 years in professional software development. I wanted to write a post to mark the occasion back then, but couldn't find the time. This post is my attempt to make up for that omission. In fact, I have been involved in software development for a little longer than 20 years. Although I had my…
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Setting up your spare Mac for Claude Code to control, a step-by-step guide
Step-by-step guide to turning your spare Mac into an always-on machine Claude Code can fully control - talk to it from your phone through the Claude app or from your main Mac over SSH.
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What is malloc doing, anyway?
malloc has a very nice and simple interface: you ask for a certain amount of memory, and you’re given a void pointer to your block of contiguous bytes that’s been magicked into existence. Once you’re done with it, you call free with the same pointer and the memory disappears into the ether.
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Jeffgeerling.com has been migrated to Hugo
Since 2009, this website has run on Drupal. Starting with Drupal 6, and progressing through major site upgrades and migrations to 7, 8, 9, and 10, I used the site as a way to dogfood the same CMS (Content Management System) I used in my day job for over a decade. But as time progressed—especially after completing a…
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Parse, Don't Validate and Type-Driven Design in Rust
Applying the type-driven mindset to rust via the "Parse, don't Validate" pattern
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How My Images Are Dithered
Hello there! This is my personal website and it is allergic to SEO.
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Audio Reactive LED Strips Are Diabolically Hard
I spent years building one of the most popular LED strip visualizers on GitHub. It's the kind of project that's easy to get started but diabolically hard to master.
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AI code and software craft
Update (Feb 17, 2026)—I no longer agree with many statements made in this blog post. I am leaving it here unmodified. See my follow-up: AI can sort of code, can't write .
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NP-overrated
If you learned about NP-hard problems in university, your takeaway was probably this:
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Reverse-engineering the 1998 Ultima Online demo server
After 10 years of on-and-off work, I’m releasing a full reverse-engineering of the 1998 Ultima Online demo server: https://github.com/draxinar/ouo . About 5,000 functions disassembled from MSVC x86 and translated into portable C99, with each function compared instruction-by-instruction against the binary.