Craneware Interview Challenges

Set of engineering challenges with the focus on finding a good solution and applying well known engineering practices and code design principles.

Coding Challenge

1. Write a method to reverse a string

In the ReversingString project, there is a method called Reverse in StringUtilities class. Implement this method so that it returns the string in reverse order:

Examples:

Input:  "FooBazQux"
Output: "xuQzaBooF"

Input:  "Hello Bar"
Output: "raB olleH"

2. Implement a code to provide and shuffle a pack of cards

Add code to the CardGame project. The project already contains contracts (interfaces) that must be implemented. The implementation must contain the following:

• Provide a standard pack of 52 cards,
• A card can be removed from the top of the pack,
• The pack can be shuffled which will:
  • Return all removed cards to the pack so that the pack is reset to all 52 cards,
  • Randomise the order of cards in the pack.

Example:

pack.TakeCardFromTopOfPack();
pack.Shuffle();
Debug.Assert(pack.Count==52);

Design Challenge

3. Design a RESTful API service

Design a RESTful API service that will output an average temperature of the last 5 days for a given geolocation. You can use openweather API to retrieve the data to use.

Use cases

Consider the following necessary use cases

• Service accepts a geolocation (latitude and longitude)
• Service has high availability
• Service is resilient

Constraints and assumptions

• Support only anonymous users
• Service is efficient on resource allocation e.g. same location might be requested many times
• Service should prevent being exploited by automated tools

The aim of the design challenge is to come up with an approach and a design that can be reviewed and elaborated during the interview. The design challenge is required only to contain a high level design diagram - any notes or details or specifications on the design challenge are not necessarily required to get submitted. However, they can greatly facilitate and drive discussions.

Notes:

• All challenges can have multiple approaches. Can you think of these and explain their pros and cons?
• The implementations should follow TDD
• Publish your answers on a Git repo that can be reviewed & discussed during the interview
  • A commit history that shows the coding progress of coding challenge should be present