Have you had high-load projects and what was the highest load on a project?

In one of my projects in Go, I worked with a payment processing system where the load reached up to 10,000 requests per second. To ensure high performance, goroutines and channels were used for parallel processing, as well as database optimization through connection pooling and caching. Additionally, monitoring and profiling tools were employed to identify bottlenecks and scale services in a timely manner.