Is Uniswap on base?

I'm curious, is Uniswap currently operating on a base layer or is it utilizing a different infrastructure? Given its popularity and role in the decentralized finance space, it's important to understand the underlying technology that powers this platform. Can you clarify whether Uniswap is indeed on a base layer, and if so, which one specifically? Additionally, how does this impact its performance, scalability, and overall user experience?