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Too Many Open Files
Recently I’ve been working on a pretty big rust project and to my surprise Icouldn’t get tests to work properly.
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The latest blog posts to take off on Hacker News. 21,819 posts.
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An Interactive Guide to Rate Limiting
Learn about rate limiting algorithms with interactive apps, including Token Bucket, Leaky Bucket, Fixed Window, and Sliding Window methods
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A masochist's guide to web development
I have recently worked on making a web application out of my latest Rubik’s cube optimal solver . This involved building a rather complex C code base (with multithreading, SIMD, callback functions and whatnot) to WebAssembly via Emscripten , and writing a minimal amount of JavaScript and HTML for the frontend.
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Curate your shell history
You can make your shell history more useful by removing the typos and false starts.
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Swift and the Cute 2d game framework: Setting up a project with CMake
Cute Framework is a simple, yet powerful C/C++ framework for building 2D games using the modern GPU pipeline. While C or C++ is fine, Swift is a modern language that many developers prefer for its safety and expressiveness. In this post, we will explore how to set up a project using Cute Framework with CMake, enabling…
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Weaponizing Dependabot: Pwn Request at its finest
Your trusty Dependabot (and other GitHub bots) might be an unwitting accomplice. Through "Confused Deputy" attacks, they can be tricked into merging malicious code. This doesn't stop here. It can escalate to full command injection via crafted branch names and even bypass branch protection rules. Plus, we disclose two…
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I made a search engine worse than Elasticsearch (2024)
Integrating my BM25 pandas search library, SearchArray, into BEIR, in order to embarass myself in public.
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10 Years of Betting on Rust
I wrote my first line of Rust in June 2015, a month after Rust 1.0 landed. Coming from C, Python, and JavaScript, I never looked back. Two Rust-based startups and 500k lines of Rust later, here are some reflections on the milestone.
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My first attempt at iOS app development
A week ago, I knew absolutely nothing about Swift. Today, I have a working iOS app sitting on my Mac and my test device
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LLMs and Elixir: Windfall or deathblow?
How the Elixir community can survive — and thrive — in an age of LLMs.
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Ada and SPARK enter the automotive ISO-26262 market with Nvidia
AdaCore and NVIDIA have decided to publish this reference process freely as an open-source and evolving document, allowing the industry at large to adopt…
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How Compiler Explorer Works in 2025
How we handle 92 million compilations a year without everything catching fire
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Prompt engineering playbook for programmers
Turn AI coding assistants into more reliable development partners
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Go is a good fit for agents
Golang might just be the best language for building AI agents.
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Why I wrote the BEAM book
The story behind writing The BEAM Book-ten years, three publishers, and an open‑source sprint.
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Machine Code Isn't Scary
Machine code isn't scary. If you can make sure your JSON conforms to a JSON schema, you can write machine code.
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Mapping latitude and longitude to country, state, or city
I made a library that takes GPS coordinates and gives you the state.
2479
Swift at Apple: Migrating the Password Monitoring Service from Java
Swift is heavily used in production for building cloud services at Apple, with incredible results. Last year, the Password Monitoring service was rewritten in Swift, handling multiple billions of requests per day from devices all over the world. In comparison with the previous Java service, the updated backend…
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(On | No) Syntactic Support for Error Handling
Go team plans around error handling support
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Conformance checking at MongoDB: Testing that our code matches our TLA+ specs
Testing code fidelity with TLA+ specs at MongoDB. Explore conformance checking experiences and agile modelling in distributed systems.
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MonsterUI: Python library for building front end UIs quickly in FastHTML apps
Accelerate your UI development with MonsterUI, our Python library for building frontend UIs quickly in FastHTML apps.
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CVE 2025 31200
Background On April 16, 2025, Apple released a patch for a bug in CoreAudio which they said was “Actively exploited in the wild.” This flew under the radar a bit. Epsilon’s blog has a great writeup of the other bug that was presumably exploited in this chain: a bug in RPAC. The only thing out there that I am aware of…
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How I like to install NixOS (declaratively)
For one of my network storage PC builds, I was looking for an alternative to Flatcar Container Linux and tried out NixOS again (after an almost 10 year break). There are many ways to install NixOS, and in this article I will outline how I like to install NixOS on physical hardware or virtual machines: over the network…
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Structured Errors in Go (2022)
Bridge the gap between structured logging and errors in Go
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Progressive JSON
Why streaming isn't enough.
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Why we still can't stop plagiarism in undergraduate computer science (2018)
Lessons on incentives and scaling from two years as a teaching assistant
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My five-year experiment with UTC
Transform Your Time Management Forever! Discover how switching to UTC eliminated time zone confusion, boosted productivity, and simplified global scheduling for remote work.
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A Complete Guide to Meta Prompting
Check out our deep dive on the latest meta prompting methods, like DSPy and TEXTGRAD, and the best prompt generator tools out there.
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Implementing a Forth
(Image of "Four-Armed Chuck" programming a PDP-11 is from my giant write-up of Forth .)