Over time, Wooga has evolved the backend architecture of its games from using traditional client-server models with Flash and mobile clients, to using HTTP APIs, load balancers, app servers, and database servers. To optimize performance, Wooga has implemented techniques like caching with Redis, database profiling, hot/cold data patterns, and leveraging the concurrency of Erlang in later systems. Looking ahead, Wooga aims to build multiplayer capabilities and remove single points of failure from its infrastructure.