This module focuses on software architecture. You learn about AWS Lambda as a home for your application code. You also investigate three different types of application architecture: microservices architecture, monolithic architecture, and service-oriented architecture. You walk through a conceptual ecommerce application, and compare how to build an application based on each architecture type. Next, you learn how to expose your application logic as an application programming interface (API). In a lab environment, you deploy a Lambda function and an Amazon API Gateway API by using the AWS Serverless Application Model (AWS SAM).

In this module, you learn about using a database for your application data. You explore both relational databases with Amazon Relational Database service (Amazon RDS), and NoSQL databases with Amazon DynamoDB. You learn about the differences between relational databases and NoSQL databases, and when you would choose one type of database instead of the other. You also explore different examples of how to access relational databases and DynamoDB from a Python application.

This module introduces you to another way that you can integrate your applications: by using messaging and event buses. You learn how to integrate applications by creating a topic in Amazon Simple Notification Service (Amazon SNS) and adding multiple subscribing applications. You then explore how an application sends messages to an Amazon Simple Queue Service (Amazon SQS) queue, and how consumer applications retrieve messages from that queue. Next, you investigate event-driven applications, which are another type of application architecture. You learn how an application can be designed as a series of both events, and applications that create and respond to these events. Finally, you learn how an application can receive, filter, transform, route, and deliver events by using Amazon EventBridge.