Every slow query investigation eventually reaches the same moment: you run EXPLAIN ANALYZE, and the plan makes no sense. Postgres
Continue readingReading EXPLAIN ANALYZE: Why Postgres Ignores Your Index
Your CPU does not read single bytes. It moves memory between caches in fixed-size blocks called cache lines — 64
Continue readingFalse Sharing in Go: How 64-Byte Cache Lines Slow Down Race-Free Code
Your webapp has a feature where users can attach an image by URL. A user submits https://example.com/logo.png and the backend
Continue readingSSRF: The Vulnerability That Turns Your Server Against Its Own Network
Ask an LLM for JSON and you will usually get JSON. “Usually” is the word that ruins your week. One
Continue readingConstrained Decoding: How Structured LLM Output Actually Works
Every codebase has one. A function nobody wants to touch, guarded by a check so strange it looks like vandalism:
Continue readingChesterton’s Fence and the Ethics of Deleting Legacy Code
“It’s slow” is the least useful bug report in software. “It’s slow when 400 users hit the checkout endpoint simultaneously,
Continue readingProcesses vs Threads vs Coroutines: The Units of Concurrency
Most developers treat strings as a solved problem: a string is text, text is easy, move on. Then one day
Continue readingStrings, Bytes, and Unicode: Why ‘café’ Breaks Your Code
Every language you have ever used has a hash table hiding somewhere in it. Python calls it dict, Go calls
Continue readingHow Hash Tables Actually Work: Collisions, Load Factors, and the Resize Dance
A test that fails every time is annoying. A test that fails some of the time is corrosive. The always-failing
Continue readingKilling Flaky Tests: Reproduce, Quarantine, Fix
Two years into the coding-agent era, a plain Markdown file has quietly become standard infrastructure. AGENTS.md is the place where
Continue readingAGENTS.md: Teaching Coding Agents to Work in Your Repository