netcode

Blizzard's Timothy Ford explains in this 2017 GDC session how Overwatch uses an Entity Component System architecture for layered gameplay. He also covers its server-authoritative netcode with client-side prediction and how they keep the game responsive and fair.

Bungie's David Aldridge explains the networking programming behind Halo: Reach in a 2011 GDC session. It covers how gameplay stays in sync online, including forecasting and state reconciliation.