I’m back in my flat in central London with some real solo-founder problems: I shipped the Android version of Zelos and my user base jumped by a few hundred… and then my storage bill basically exploded overnight. I was doing zero caching, so every feed refresh was hammering Firebase Storage directly. In this episode I walk through the fix—device caching plus setting up a CDN—because once you have real users, the “it’s only £1 a day” mindset disappears fast. This little oversight cost me around £50–£60 in two days, but the drop in bandwidth after caching was a huge relief. After that, it’s back to building: I’m grinding on a new “showcase” feature, fighting Flutter UI issues, then finally admitting the default widgets weren’t the move and switching to a library that solved the scrolling problem. I also went to an N8N AI agents event to network harder in London, and I’m doubling down on marketing—posting at least one reel a day because I can literally see account creation spike when a reel hits. To keep myself sane, I set up Google Cloud monitoring dashboards (including pirate metrics) so I can track growth and costs, then I end the day with calisthenics training—because the whole point is building a no-regrets life while I build in public.