Creating enterprise web application using AWS LAMDA & API Gateway

[Bargavi]

Can we create an enterprise web application using AWS Lamda? An application like a Client Management application which may have functionalities like below - managing the customer details and logins - Invoicing module for customers - generate and updates invoice and notify the customer using email - Reporting on profit and loss.

If you think this can be attained using AWS Architect API Gateway and AWS Lamda, Can you please let me know the high-level architecture of this system?

NB> I am very new to this AWS world and I am trying to learn its use in a real-world scenario and how to architect it