In many applications, a single Lambda function contains all the application logic that handles all external events. The Lambda function sometimes acts as an orchestrator, handling different business workflows within complex logic. This approach has several drawbacks, like big package size, difficulty enforcing least privilege principles, and hard to test.

In this session, I will explain how to leverage the Hexagonal Architecture, also known as the “Ports and Adapters” approach, to refactor a Lambda monolith into microservices.