Server-Side Challenge

Welcome to the Opn.Pro (Commerce) Engineering candidate testing area.

Please note that:

• We prefer to accept your assignment via GitHub or a similar platform.
• Please be prepared to present your code and code review with the interviewer.

1. RESTful API

Our commerce services need an interface where it bridges between frontend and data source, so we decided to have a RESTful API where it supports following pages.

Pages

• Registration page is where new member can start their membership.
  • Fields submitted: email, password, name, date of birth, gender and address, subscribe to newsletter.
• Profile page is where we can see their information.
  • Fields to display: email, name, age, gender, address and subscribe to newsletter.
• Edit profile page is where members can update their information.
  • Fields allowed to edit: date of birth, gender, address and subscribe to newsletter.
  • Members can delete their account regarding PDPA policy.
• Password change page is where members can set their new password by entering current password and following with new password and confirmation.

Requirements

• Your program will serve a RESTful API.
• Your API will be called via an HTTP client, e.g.: Postman, curl.
• No need to connect to the database.
• Authentication should be verified from header "Authorization" with mock value e.g.: Authorization: Bearer faketoken_user1
• Validation have additional score.

Notes

• Our expectation regarding this topic is to observe how you implement the RESTful API project.
• You will submit with language you are requested to do so. (detault=node.js)
• Any idea that makes your application better are acceptable.

2. Database

Design a database contains tables that support bellowing requirements.

Requirements

• As a store owner, I'd like to save customer information, so I can track age, gender and location for analysis purpose.
• As a store owner, I'd like to have a list of products, so my customers can browse and discover my collections.
  • Each product can be listed in categories.
  • Each product has different and multiple variation which can be color, size or anything.
• As a store owner, I would like my customers to be able to add items to cart, so they can process to check out.

Notes

• Our expectation regarding this topic is to observe how familiar you are with the database.
• Your design can be detailed as much as you want.
• Any format of the design are acceptable, example: TXT, MD, SQL, JSON or any visual diagram as long as you can explain.

3. Coding

Write a service called Cart which serve usage listed below.

Basic - Cart service that can manage items.

• Cart can be created
• Product can be added to cart via product id
• Cart can be updated via product id. This update must be an absolute update
  • i.e. updating product id 1 with quantity of 10 will update the cart product id 1 in cart to quantity of 10
• Product can be remove from cart via product id
• Cart can be destroy

Utilities - Functions that save consumers effort.

• Can check if product already exists
• Can check if cart is empty
• Can list all items in cart
• Can count number of unique items in cart
• Can return the total amount of items in cart

Discount - Sometimes customer apply coupon or voucher.

• Discount should be apply to cart which directly changes the total amount of the cart
• Discount should have a name identifier
• Discount should be calculated as
  • fixed where cart is deducted according to the discounted amount
  • percentage where cart is deducted as a percentage from the total amount but not exceeding the maximum set with the discount.
    • A cart with the total of 2,000 THB with a 10% discount and maximum of 100 THB will only apply 100 THB discount.
• Should be able to remove discount by name

Freebie - "Buy A get B for free!"

• Freebie should be able to be apply to the cart with the following conditions
  • If a cart contains the a product then add freebie product into the cart
    • i.e. if a cart contain product 1 then add product 2 with quantity 1 to the cart

Requirements

• Your code should be executable on console or unit test.
• No need to connect to any storage or database.
• Validation is not required.
• Negative cases have additional score.

Notes

• Our expectation for this topic is to assess your coding skills.
• You will submit with language you are requested to do so (default=nodejs).
• Bonus consideration for OOP

4. Solution Architecture

Design microservices architecture for MVP Instagram-like mobile application which supports following features.

Features

• Content uploading - Photo and video should be resized and reformatting
• Feeds - Sort the selected content to each user
• Interaction - Like and comment at content also notify the content owner
• Messaging - Generic chat system
• Notification - Notify user on their phone and email
• Analytics - Report content's view and interaction daily and send to owner email

Requirements

• You need to consider the time-to-market as first priority, following with cost and extensibility.
• Your architecture can contain real service provider, e.g.: AWS, GCP, Firebase etc.
• The diagram should come with pros, cons, risks and extensibility.

Notes

• Our expectation for this topic is to evaluate your architectural skills.
• You are required to present this to the Engineering/Project/Business/Product/QA Team.