lastseen.city - what happens when a side project gets seen

lastseen.city started as a Config Makeathon entry: a place to archive memories of lost places - buildings, shops, corners of cities that don't exist anymore. I built the core loop fast - a heatmap, cached map positions so browsing doesn't hammer the database, and around 190 archive entries seeded in through direct Supabase SQL inserts to get the map feeling alive before a single real visitor showed up.

The part I didn't plan for was the reach. I seeded the Reddit communities of a handful of cities to get it in front of people who'd actually have a lost place to submit, and it took off - hundreds of thousands of views, thousands of comments, submissions from dozens of countries I never targeted. The visual identity - the textures, the map styling - came out of Figma Weave, and I ended up publishing the design system and some of the Make widgets back to the Figma Community, since half the value of building something like this fast is not rebuilding the same primitives next time.

What stuck with me: the technical build was maybe a third of the actual work. Seeding the right communities, in the right order, with the right framing, is what turned a weekend project into something with real organic distribution. That's a skill nobody puts on a component library.