Flow

$1.$ The initial request originates from the user, which can be a browser or hand$-$held device.

$2.$ The user is presented with a standard home page with an option of login $($or sign up$)$

$3.$ Once the authentication is complete, the user is presented with a more detailed page of

various products.

$4.$ The user now shops and fills the cart and checks out.

$5.$ The backend server processes the request.

$6.$ The warehouse looks up the order and prepares for dispatch.

$7.$ A notification is sent to the customer with various updates.

$8.$ The shipment is dispatched and reaches the customer.

Bill of materials

$1.$ The file storage is $5$TB in size.

$2.$ The database is open$-$source MySQL version $8$ running on a server with $16$ CPUs, $64$GB

RAM, and $2$TB SSD$.$ A backup server with the exact specifications runs the secondary

database.

$3.$ The user authentication layer and API Gateway are implemented together and run on $3$

instances, each with $4$CPU, $8$GB RAM, and $512$GB HDD$.$

$4.$ The server tier has $10$ servers, each with $8$CPU, $32$GB RAM, and $512$GB SSD$.$

$5.$ The warehouse systems are all hand$-$held devices. An estimated $50$ such devices

access the warehouse application hosted in the server tier.

$6.$ The technical IT staff comprises of $1$ architect, $1$ technical lead, $5$ DevOps engineers, $1$

networking engineer, $1$ DBA.