Multiplayer video games, realtime updating webpages, database bindings, sync protocols (I play around around with CRDTs a lot), p2p distributed systems, whateve

Multiplayer video games, realtime updating webpages, database bindings, sync protocols (I play around around with CRDTs a lot), p2p distributed systems, whatever really! Implementing a wire protocol seems to come up about once every couple of years. And for context, I've been programming now for about 30 years.