opn-ooo/opn-th-server-side-challenge

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 bellowing 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.

// Create cart object
cart = Cart.create(customer_id)

// Add or increase item quantity in cart by product id.
cart.add(product_id, quantity)

// Replace item quantity or remove item from cart by product id.
cart.update(product_id, quantity)

// Delete item from cart by product id.
cart.remove(product_id)

// Delete cart object.
cart.destroy()

Utilities - Functions that save consumers effort.

// Check id product is already in cart, boolean returned.
has = cart.has(product_id)

// Check if cart contains any items, boolean returned.
isEmpty = cart.isEmpty()

// Display list of items and quantity, json returned.
count = cart.count()

// Get number of different items, int returned.
quantity = cart.quantity()

// Get amount of total items, int returned.
total = cart.total()

Discount - Sometimes customer apply coupon or voucher.

• addDiscount - Apply a promotion to cart that effect directly to total
  • Accept 2 parameters
    • name - An identifier.
    • discount - A parameters to be calculated.
      • Case1: Deduct 50.- total
        • {type: "fixed", amount: 50}
      • Case2: Deduct 10% from total but not over 100.-
        • {type: "percentage", amount: 10, max: 100}
• removeDiscount - Remove promotion by name.

discount = {type: "percentage", amount: 10, max: 100}

total = cart.total() // 2500

cart.addDiscount(name, discount)
total = cart.total() // 2400

cart.removeDiscount(name);
total = cart.total() // 2500

Freebie - "Buy A get B for free!"

• addFreebie - Apply a promotion to cart that effect directly to items
  • Accept 3 parameters
    • name - An identifier.
    • condition - A valiation rule cart should applied to get reward.
    • reward - A return if cart applied to condition

cart.add(1, 1)

condition = {type: "contains", product_id: 1}
reward = {product_id: 2, quantity: 1}
cart.addFreebie(name, condition, reward)

cart.has(2) // true
cart.count() // 2

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).

4. Solution Architecture

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