2009: my first real project — the one where I moved from iterative C to object-oriented C++. A text-mode dungeon crawler — hero, rooms, items, enemies, all modeled as classes. No code survives, but a lot of happy hours do.

My very first program, written in high school (2006): a little C tool that expanded (a + b)ⁿ for any power. No technical merit whatsoever — but it's where it all started.