I used to work on a system that did about 55k/sec at peak. The service was internal it was only handling grpc calls which were coming from inside our VPC and it

I used to work on a system that did about 55k/sec at peak. The service was internal it was only handling grpc calls which were coming from inside our VPC and it was written in Go. It's main job was was reading and writing to an SQL db that was sharded across 3 or 4 of the biggest instances AWS offered at the time (2017ish). Everything was Dockerized and I think we were using Docker Swarm for container orchestration. I don't remember the specs for each box, but we had auto scaling set up so at peak we'd hit a little over 200 containers. Looking back now, I'm sure we could have gotten much better performance out of that service, but the team was young and inexperienced and throwing money at the problem was an easier solution.