As a former Oracle Fusion Middleware team member, I would outline middleware and integration methodologies and tools during past two decades.
I authored Enterprise Integration in a Nutshell before, which explains how middleware supports enterprise integration. Middleware covers application servers, ESB, SOA, and API design. A typical 3-tier setup is common in SOA. It includes a front end, business logic on the app server, and a back-end database. This pattern helps organize systems and data flows.
Design patterns apply to both 3-tier and multi-tier development. Additionally, creational, structural, and behavioral patterns guide these layers. Model view controller (MVC) is used in large 3-tier apps. This approach supports scalable, reusable software components across teams...
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