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How to code Claude Code in 200 lines of code
The core of tools like Claude Code, Cursor, and Warp isn't magic. It's about 200 lines of straightforward Python. Let's build one from scratch.
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The latest blog posts to take off on Hacker News. 21,817 posts.
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ASCII-Driven Development
~15 years ago, we had Balsamiq Mockups (2008). Deliberately sketchy. Intentionally low-fidelity. The comic-sans-looking wireframes were a…
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Go.sum is not a lockfile
In Go, go.mod acts as both manifest and lockfile. There is never a reason to look at go.sum.
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Git Rebase for the Terrified
As a maintainer of several OneBusAway projects, I regularly ask contributors to rebase their branches before merging. The response is often hesitation or…
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Building voice agents with Nvidia open models
Build an ultra-low-latency voice agent with NVIDIA open models. Learn how Nemotron Speech ASR achieves sub-25ms transcription, how Nemotron 3 Nano LLM and Magpie TTS work together, and how to optimize architecture for real-time voice AI deployment.
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Many hells of WebDAV
Standards are great, until they aren't
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We might have been slower to abandon StackOverflow if it wasn't a toxic hellhole
What the **** does that mean?
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“Stop Designing Languages. Write Libraries Instead” (2016)
I had a friend tell me recently that all programming languages seem very similar to each other. They all have variables, and arrays, a few loop constructs, functions, and some arithmetic constructs. Sure, some languages have fancier features like first-class functions or coroutines, but he doesn't consider himself an…
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Opus 4.5 is not the normal AI agent experience that I have had thus far
Three months ago I would have dismissed claims that AI could replace developers. Today, after using Claude Opus 4.5, I believe AI coding agents can absolutely replace developers.
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Why is the Gmail app 700 MB?
The current state of app bloat.
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C Is Best (2025)
Since its inception on 2000-05-29, SQLite has been implemented in generic C. C was and continues to be the best language for implementing a software library like SQLite. There are no plans to recode SQLite in any other programming language at this time.
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Brave overhauled its Rust adblock engine with FlatBuffers, cutting memory 75%
Brave has overhauled its Rust-based adblock engine to reduce memory consumption by 75%, bringing better battery life and smoother multitasking to all users.
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So, you want to chunk really fast?
How we built memchunk - a blazing fast text chunking library using SIMD and memchr for RAG pipelines
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Dealing with abandonware (2024)
reverse engineering, abandonware
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I switched from VSCode to Zed
For many years VSCode has been my day-to-day IDE for everything: Python, Go, C, occasional frontend development, and what not. It was never...
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Claude Code On-the-Go
Running six Claude Code agents in parallel from an iPhone. A cloud VM, Tailscale, mosh, and push notifications enable async development from anywhere.
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Stop Forwarding Errors, Start Designing Them
We develop fast Rust crates and release them fast.
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Lessons from 14 years at Google
Lessons learned from 14 years of engineering at Google, focusing on what truly matters beyond just writing great code.
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Web development is fun again
AI tools brought me back to levels of productivity I haven't felt in years. Web development is fun again.
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Street Fighter II, the World Warrier (2021)
This article is part of a series about Street Fighter II and the CPS-1. It is recommended to read the previous entries before reading this one.
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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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Maybe comments should explain 'what' (2017)
People say “Comments should explain why, not what.” I feel like starting a flame war today so I’m going to argue that comments should explain ‘what’ too. Please don’t use this as justification to write bad code, okay? Okay. First of all, why shouldn’t comments explain ‘what’? If you need comments to explain what’s…
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Going immutable on macOS, using Nix-Darwin
From imperative chaos to nix-darwin
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Welcome to Gas Town
Happy New Year, and Welcome to Gas Town!
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Can Bundler be as fast as uv?
At RailsWorld earlier this year, I got nerd sniped by someone. They asked “why can’t Bundler be as fast as uv?” Immediately my inner voice said “YA, WHY CAN’T IT BE AS FAST AS UV????” My inner voice likes to shout at me, especially when someone asks a question so obvious I should have thought of it myself. Since then…
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Build a Deep Learning Library
Instead of just learning how to use a deep learning library, we are going to learn how to create one.