API Gateway Pattern : Sits between the client apps and the microservices. It acts as a reverse proxy, routing requests from clients to services. It can also provide other cross-cutting features such as authentication, SSL termination, and cache.
CQRS Pattern : Stands for Command and Query Responsibility Segregation, a pattern that separates read and update operations for a data store.
Strangler Fig Pattern : Migrates a legacy system by gradually replacing specific pieces of functionality with new applications and services. As features from the legacy system are replaced, the new system eventually replaces all of the old system's features, strangling the old system and allowing you to decommission it