Serverless website using Angular, AWS S3, Lambda, DynamoDB and API Gateway

Serverless architecture – you might have already heard this term. But have you tried to build one? And do you understand what Serverless architecture really means? Typically a web application requires an infrastructure to host Web Server, Application Server, and Database Server. Traditionally organizations had either their own datacenters or rented servers to manage such requirements. With Cloud – Pay as you use model has gained a lot of popularity. The headache of managing physical infrastructure has been moved to vendors like Amazon, Microsoft, and Google. Given all that, your team is still responsible to provision, monitor and manage the servers.

With Serverless Architecture, Organizations gain total freedom from managing infrastructure and can focus on building functionality. The need for scaling, patching and provisioning servers is opaque to the development team, rather it is a responsibility of a Cloud Vendor. In this article, we will build a Serverless architecture with a Dynamic Web Application using Angular, AWS S3, Lambda, DynamoDB, and API Gateway.
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What is lambda? and why do we need it?

When I started coding GUI application using Java, I realized my code was cluttered with too many anonymous classes. Each time, I had to handle an event the inlined implementation of ActionListener introduced nested and unreadable lines of code. How many of you have written code like below

signUpUserBtn.addActionListener(new ActionListener(){
  public void actionPerformed(ActionEvent e){

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