Berlin is Europe's densest startup ecosystem and one of the top fintech and SaaS hubs on the continent. The city is home to a high concentration of funded scale-ups, engineering talent, and early-stage companies moving fast. Investors and CTOs here expect software that ships quickly, handles real production load, and can grow from 10 to 10,000 users without a rewrite. The pace of iteration in Berlin is closer to San Francisco than to Frankfurt.