Two months, one engineer, one production B2B marketplace — what AI-directed full-stack actually looks like

I shipped a production B2B marketplace for the Russian HVAC industry — wentmarket.ru — alone, in two months, end to end. Not an MVP. Full commerce, seven external integrations, seventeen engineering calculation engines, 101 Prisma models, 446 test files, real paying customers. This post is the breakdown of what was actually in it, how the work was split between me and Claude Code, and the parts I would not delegate again. If your first reaction is "solo-built in two months is a red flag, not a f