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New
The latest blog posts to take off on Hacker News. 1,748 posts.
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Python Workers redux: fast cold starts, packages, and a uv-first workflow
Recent advancements in Cloudflare Python Workers means fast cold starts, comprehensive package support, and a great developer experience. We explain how they were achieved and show how Python can be used to build serverless applications on Cloudflare.
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Using Python for Scripting
"Use the right tool" is nice in theory, but not when the tool acts a bit differently from machine to machine, and isn't always installed.
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GitHub Actions has a package manager, and it might be the worst
GitHub Actions has a package manager that ignores decades of supply chain security best practices: no lockfile, no integrity verification, no transitive pinning
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Microservices should form a polytree
Microservices work best as a polytree with clear dependencies and no cycles. Learn how this structure reduces complexity and makes systems easier to scale and maintain.
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Scala 3 slowed us down?
Is this clickbait? Not really. Is this the fault of the language or the compiler? Definitely not. Rather, it was part of a rushed migration. Sharing the lessons learned in the process.
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The Anatomy of a macOS App
How Mac applications evolved from a multitude of resources to a bundle formed from a standard layout of directories, and how they have come to be largely self-contained in macOS 26.
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Java Hello World, LLVM Edition
After exploring Java bytecode in previous years (2022, 2023, 2024), this year we’ll take an unexpected detour for a Java advent: instead of generating Java bytecode, we’ll use Java to build and execute LLVM IR, the intermediate language behind compilers like clang. Using Java’s Foreign Function & Memory (FFM) API…
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Go is portable, until it isn't
An exploration of Go's portability limits when integrating with system-specific C libraries like libsystemd and dealing with glibc vs. musl systems.
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Eurydice: a Rust to C compiler
Perhaps the greatest surprise of the last two years was, for me, the realization that people not only care about compiling C to Rust (for obvious reasons, such as, ahem, memory safety) – they also care about compiling Rust to C! Wait, what?
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Using LLMs at Oxide
Large language models (LLMs) are an indisputable breakthrough of the last five years, potentially profoundly changing the way that we work. As with any extraordinarily powerful tool, LLM use has both promise and peril — and that they are so general-purpose leaves real questions about how and when they should be used…
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Fizz Buzz in CSS
How many CSS selectors and declarations do we need to produce the Fizz Buzz sequence? Of course we could do this with no CSS at all simply by placing the entire sequence as text in the HTML body. So to make the problem precise as well as to keep it interesting, we require that all text that appears in the Fizz Buzz…
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Why we built Lightpanda in Zig
We chose Zig over C++ and Rust because we wanted a simple, modern systems language. Here's what we learned building a browser with it.
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Patterns for Defensive Programming in Rust
I have a hobby. Whenever I see the comment // this should never happen in code, I try to find out the exact conditions under which it could happen. And in 90% of cases, I find a way to do just that. More often than not, the developer just hasn’t cons…
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Writing our own cheat engine (2021)
First entry on completing Cheat Engine's tutorial without Cheat Engine
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Thoughts on Go vs. Rust vs. Zig
What do each of these languages value most?
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Super-Flat ASTs
In my previous post, I introduced the simp le programming language. Near the end of that post, I mentioned that the parser isn't very efficient.
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Booting Linux in QEMU and Writing PID 1 in Go to Illustrate Kernel as Program
Most books and courses introduce Linux through shell commands, leaving the kernel as a mysterious black box doing magic behind the scenes. In this post, we will run some experiments to demystify it: the Linux kernel is just a binary that you can build and run.
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Programming peaked
It helps, of course, that I still consider many of the people I worked with friends, and I know some of them even still read this blog. (Hi!)
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Why WinQuake exists and how it works
When I took a look at the history of Quake binaries, they all made sense to me. quake.exe was the original release, able to run on DOS and Windows 95. Then came vquake.exe to support the hardware accelerated chip Vérité 1000. Later, glquake.exe generalized hardware acceleration to any vendor providing OpenGL drivers…
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Jujutsu worktrees are convenient (2024)
Jujutsu worktrees are very convenient! In git, worktrees are an old concept. The idea is that you can effectively work on your project in 2 different folders …
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8086 Microcode Browser
Since releasing 486Tang , I’ve been working on recreating the 8086 with a design that stays as faithful as possible to the original chip. That exploration naturally led me deep into the original 8086 microcode — extracted and disassembled by Andrew Jenner in 2020.
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You can't fool the optimizer
Pattern recognition can see through obfuscated code to find the right instruction
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LLM from scratch, part 28 – training a base model from scratch on an RTX 3090
I felt like it should be possible to train a GPT-2 small level model on my own hardware using modern tools and open datasets from scratch. It was!
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Anthropic acquires Bun
Bun has been acquired by Anthropic. Anthropic is betting on Bun as the infrastructure powering Claude Code, Claude Agent SDK, and future AI coding products & tools.
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Progress on TypeScript 7 – December 2025
Earlier this year, the TypeScript team announced that we've been porting the compiler and language service to native code to take advantage of better raw