Skip to content

Latest commit

 

History

History
135 lines (100 loc) · 5.58 KB

back-end.md

File metadata and controls

135 lines (100 loc) · 5.58 KB
Raw

BE take-home coding challenge guidelines.

Please organize, design, test, document, and deploy your code as if it were going into production.

Challenge Description

Write a program that can price a cart of products from different countries, accept multiple products, combine offers, and display a total detailed invoice in USD as well.

Available catalog products and their respective price in USD (regardless of the shipping country): Hint: see below, how to calculate each item shipping fees

Item type Item price Shipped from Weight
T-shirt $30.99 US 0.2kg
Blouse $10.99 UK 0.3kg
Pants $64.99 UK 0.9kg
Sweatpants $84.99 CN 1.1kg
Jacket $199.99 US 2.2kg
Shoes $79.99 CN 1.3kg

Each country has a shipping rate per 100 grams

Shipping rates: Hint: see below, how to calculate each item shipping fees

Country Rate
US $2
UK $3
CN $2

The program can handle some special offers, which affect the pricing.

Available offers:

  • Shoes are on 10% off.
  • Buy any two tops (t-shirt or blouse) and get any jacket half its price.
  • Buy any two items or more and get a maximum of $10 off shipping fees.

There is a 14% VAT (before discounts) applied to all products, whatever the shipping country is.

The program accepts a list of products, outputs the detailed invoice of the subtotal (sum of items prices), shipping fees, VAT, and discounts if applicable.

e.g.

Adding the following products:

T-shirt
Blouse
Pants
Shoes
Jacket

Outputs the following invoice:

Subtotal: $386.95
Shipping: $110
VAT: $54.173
Discounts:
	10% off shoes: -$7.999
	50% off jacket: -$99.995
	$10 of shipping: -$10
Total: $433.129

Another, e.g., If none of the offers are eligible by adding one product:

Jacket

Outputs the following invoice:

Subtotal: $199.99
Shipping: $44
VAT: $27.9986
Total: $271.9886

Requirements

  1. PHP
  2. Stick to OO fundamentals in all aspects of your code.
  3. Stick to SOLID principles.
  4. Use pre-defined Design Patterns whenever needed in your code.
  5. Input should be via either (whatever suits you)
    1. The command line in the form createCart --product='T-shirt' --product='Blouse' --product='Pants' --product='Shoes' --product='Jacket'.
    2. Or a simple REST API.
  6. Write unit tests to cover your core code fully.
  7. No pseudo-code allowed.

Expected Deliverables

  1. Hosted repository for the program, link to it (e.g. Github, Bitbucket, etc.). Reply with the repo link to the email we sent.
  2. Code should be well structured, suitably commented, have error handling, and be tested.
  3. README file, where you describe your solution (design and architecture), how to run the program. You can use pseudo-code here.

How will we review?

Guidelines can be found here

Frequently asked questions

Q: I got confused on how to calculate an item price and its shipping and VAT
A: You can use the following table as a complete reference (DO NOT HARDCODE ANY CALCULATED VALUES)
Item type Country Item price Weight Rate Shipping VAT
T-shirt US $30.99 0.2 $2 $4 $4.3386
Blouse UK $10.99 0.3 $3 $9 $1.5386
Pants UK $64.99 0.9 $3 $27 $9.0986
Sweatpants CN $84.99 1.1 $2 $22 $11.8986
Jacket US $199.99 2.2 $2 $44 $27.9986
Shoes CN $79.99 1.3 $2 $26 $11.1986
Q: I have a more robust background in other languages than PHP. Can I use it to complete the task?
A: Yes, although the task endorses PHP as a requirement, we still believe that the best engineers are language agnostic. PHP reflects the primary language in our stack, which you'll be using daily.
Q: Can I use framework X to implement the task, use external libraries/dependencies, or shall I write the code in plain PHP?
A: The task itself doesn't require a specific framework to complete the task, nor does use a framework break the requirements; however, with a deeper understanding of the task, you can make this decision independently. Also, your choice of using any external libraries is considered as a part of our code review (Refer to the "How will we review?" section)
Q: I currently work at a full-time job/Is there a deadline to deliver it?
A: Although there's NO deadline, we endorse having you take a good look at the task; send us back your best estimate of delivery, which can show us your commitment level without putting any pressure on your schedules. Most candidates deliver it in a week.
Q: Shall I use any persistent layer (database) to manage stuff like products or currencies?
A: This doesn't come as a requirement; however, we value using practices like configurations/fixtures to control these stuff, rather than adding some admin panel to enter these data.
Q: Do I need to provide a functional user interface to represent the task? Can I use a ready-made library that implements all the required functionalities?
A: No, the task is clearly about assessing your technical knowledge and problem solving from a design and architecture point of view; not showing this means you are failing the task requirements.