While AI coding startups like Cursor close brow-raising rounds on barely three years of existence, Replit’s path to a $3 billion valuation has been anything but swift. For CEO Amjad Masad, who’s been building tools to democratize programming since 2009, it’s a story of muscling through multiple failed business models, years stuck at the same revenue plateau, and a reckoning last year that forced him to cut half his staff. That makes what happened next more remarkable. Earlier this month, the Bay...