What is your definition of a "big tech company"? Do you only mean very young startups? Going by valuation, Revolut is pretty small. ASML is 40x larger than Revolut and 4x as large as ARM. NXP and Adyen are both about as large as Spotify at 50-60 billion.
The startup scene is less vibrant: valuations are typically lower and funding is not as easy to get as it is in Silicon Valley, but you shouldn't discount established players that innovate and mature startups.
The startup scene is less vibrant: valuations are typically lower and funding is not as easy to get as it is in Silicon Valley, but you shouldn't discount established players that innovate and mature startups.