Setting up a multi-server architecture with Unreal Engine 4 and SpatialOS, building dynamic client interest management, and offloading AI to its own server.
Networking vehicles and stable physics objects in Unreal Engine — from basic position replication through INetworkPredictionInterface, hand-made physics, and a look at UE5's Chaos system.
Networking a fully dynamic sandbox in Unreal Engine — deformable terrain, buildable objects, destructible environments, and a custom projectile ballistics/penetration system.