Functional Requirements

List products

Filter products as per brand and categories

Put products into the shopping cart

Apply coupon for discounts and see the total cost all for all of the items in shopping cart

Checkout the shopping cart and create an order

List my old orders and order items history

Lets write down N-FR.

Non-Functional Requirements

Availability

Scalability

Its good to add principles in our picture in order to remember them always.

Principles

DRY

KISS

YAGNI

We are going to consider these principles when design our architecture.

Now we can consider to Database and Components of e-commerce application.

Database

Database will be single relational database — RDBMS.

Components of E-Commerce

Shop UI

Catalog Service

SC Service

Discount Service

Order Service

https://medium.com/design-microservices-architecture-with-patterns/monolithic-architecture-is-still-worth-at-2021-98bfc112dc24