Building a Fast, Memory-Efficient Hash Table in Java (by borrowing the best ideas)

One day, I ran into SwissTable—the kind of design that makes you squint, grin, and immediately regret every naive linear-probing table you’ve ever shi...

Deep Dive into LLMs like ChatGPT with Andrej Karpathy

This is a general audience deep dive into the Large Language Model (LLM) AI technology that powers ChatGPT and related products. It is covers the full...

Turning my laptop into a Search Relevance Judge with local LLMs

Local LLMs can evaluate 100s of result pairs a minute in a Macbook, enabling a new age of rapid search relevance improvements

How to Secure Environment Variables for LLMs, MCPs, and AI Tools Using 1Password or Doppler

Stop hardcoding API keys in MCP configs and AI tool settings. Learn how to use 1Password CLI or Doppler to inject secrets just-in-time for Claude, Cur...

How to Add a Symlink (From One) File (To Another)

Learn how to create a symlink from one file to another in macOS (zsh), Linux (bash), and Windows (cmd), including to cleanup the dreaded AGENTS.md var...

Attempting to Design a Back-end with Cleaner Architecture Rules and Boundaries

How I'm learning to build with better software architecture design principles (while 'moving fast and breaking things').

Company Research TUI

Terminal-inspired company research interface with keyboard navigation

williamcallahan.com

Interactive personal site with beautiful terminal/code components & other dynamic content

Brief

Terminal ChatGPT client with slash commands and tool execution

Build a Reasoning Model (From Scratch)

Sebastian Raschka

Description A deep dive into the architecture and implementation of AI models capable of logical deduction and multi-step reasoning. It explains how t...