• September 7, 2026

  5 design patterns used in my new habit tracker app

  There are plenty of habit trackers, but I wanted to build mine with constraints, a calendar view and habit streaks. So I built commitgraph: a small Django + HTMX app. Here are five Python design and testing patterns from building it.

• March 27, 2026

  The Repository Pattern: Swap Data Sources in One Line

  Your live data source just broke. The API provider changed their auth overnight, no warning, no migration path. Now your entire app is blocked.