Logic layer

Application code is likely the area of most interest and the layer that has the most changes from a traditional web application hosted on a managed server, so let's start with that.

Application code and function layout

Let's differentiate two classifications of our organization for the logical layer:

• Organization of the Lambda functions themselves, within AWS
• Organization of the application code

Lambda functions are the unit of work in Lambda and other FaaS providers (for simplicity and clarity, I will refer to these as Lambda functions from here on out). A single Lambda function may be updated or deployed in isolation without affecting other Lambda functions.

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