Allen Digital | Senior Software Engineer (SDE 3) (May-2024)

BarRaiser | Machine Coding Round

Problem Statement - Limited Time Deals

You are a budding entrepreneur who devised an idea to build an e-commerce giant like Amazon, Flipkart, Walmart, etc. As part of this ambition, you want to build a platform to duplicate the concept of Limited Time Deals.
A limited-time deal implies that a seller will put up an item on sale for a limited period, for example - 2 hours, and will keep a maximum limit on the number of items that would be sold as part of that deal.
Users cannot buy the deal if the deal time is over.
Users cannot buy if other users have already bought all the items in the deal.
Users can buy up to one item as part of the deal.

The task is to create APIs to enable the following operations
Create a deal with the price, end time(optional) and number of items to be sold as part of the deal.
End a deal.
Update a deal to increase the number of items or end-time.
Claim a deal (Basically, creating an order. No need to take care of item price or payment).

Guidelines

Document and communicate your assumptions in README.
Create a working solution with production-quality code.
Use an external database like Postgres/MySQL or any NoSQL database
Define and Create APIs to support the operations mentioned above
Write a few unit tests for the most important code

What are we looking for?
Your approach to the solution
How you write code in terms of readability and maintainability
Usage of best practices
Testing skills

You are expected to write code for the complete application and build at least one end-to-end feature. However, a complete working solution is NOT expected.

Low Level Design

How to build & run project

• Build commands

  ruchirgupta@Ruchirs-MacBook-Pro demo-service % mvn clean install package -DskipTests && mvn spring-boot:run

• Run with specific profile

  ruchirgupta@Ruchirs-MacBook-Pro demo-service % mvn clean install package -DskipTests
  ruchirgupta@Ruchirs-MacBook-Pro demo-service % mvn spring-boot:run -Dspring-boot.run.profiles=local
  ruchirgupta@Ruchirs-MacBook-Pro demo-service % mvn spring-boot:run -Dspring-boot.run.profiles=dev
  ruchirgupta@Ruchirs-MacBook-Pro demo-service % mvn spring-boot:run -Dspring-boot.run.profiles=qa
  ruchirgupta@Ruchirs-MacBook-Pro demo-service % mvn spring-boot:run -Dspring-boot.run.profiles=prod

• Build commands with jar

  ruchirgupta@Ruchirs-MacBook-Pro demo-service % mvn clean install package -DskipTests
  ruchirgupta@Ruchirs-MacBook-Pro demo-service % java -jar target/demo-service-1.0-SNAPSHOT.jar
  ruchirgupta@Ruchirs-MacBook-Pro demo-service % java -jar -Dspring.profiles.active=local target/demo-service-1.0-SNAPSHOT.jar
  ruchirgupta@Ruchirs-MacBook-Pro demo-service % java -jar -Dspring.profiles.active=dev target/demo-service-1.0-SNAPSHOT.jar
  ruchirgupta@Ruchirs-MacBook-Pro demo-service % java -jar -Dspring.profiles.active=qa target/demo-service-1.0-SNAPSHOT.jar
  ruchirgupta@Ruchirs-MacBook-Pro demo-service % java -jar -Dspring.profiles.active=prod target/demo-service-1.0-SNAPSHOT.jar

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Spring-Open Doc (swagger-ui)

• Demo-service swagger

  Once the application is up, Open the local swagger URL is Swagger Doc