Nodon Coding Challenge

Requirements

Design an API endpoint that provides autocomplete suggestions for large cities. The suggestions should be restricted to cities in the USA and Canada with a population above 5000 people.

• use this repo as foundation but feel free to change anything
• the endpoint is exposed at /suggestions
• the partial (or complete) search term is passed as a query string parameter q
• the caller's location can optionally be supplied via query string parameters latitude and longitude to help improve relative scores
• the endpoint returns a JSON response with an array of scored suggested matches
  • the suggestions are sorted by descending score
  • each suggestion has a score between 0 and 1 (inclusive) indicating confidence in the suggestion (1 is most confident)
  • each suggestion has a name which can be used to disambiguate between similarly named locations
  • each suggestion has a latitude and longitude
• all functional tests should pass (additional tests may be implemented as necessary).
• the final application should be deployed to any host like Heroku.
• feel free to add more features if you like!

Sample responses

These responses are meant to provide guidance. The exact values can vary based on the data source and scoring algorithm.

Near match

GET /suggestions?q=Londo&latitude=43.70011&longitude=-79.4163

{
  "suggestions": [
    {
      "name": "London, ON, Canada",
      "latitude": "42.98339",
      "longitude": "-81.23304",
      "score": 0.9
    },
    {
      "name": "London, OH, USA",
      "latitude": "39.88645",
      "longitude": "-83.44825",
      "score": 0.5
    },
    {
      "name": "London, KY, USA",
      "latitude": "37.12898",
      "longitude": "-84.08326",
      "score": 0.5
    },
    {
      "name": "Londontowne, MD, USA",
      "latitude": "38.93345",
      "longitude": "-76.54941",
      "score": 0.3
    }
  ]
}

No match

GET /suggestions?q=SomeRandomCityInTheMiddleOfNowhere

{
  "suggestions": []
}

Non-functional

• All code should be written in Typescript.
• Mitigations to handle high levels of traffic should be implemented.
• Code test can be submitted by mailing a link to a public repo or a .zip to your Nodon contact.
• The email should contain a link to the deployed service.
• Documentation and maintainability is a plus.
• Any kind of third party dependencies may be used.
• Feel free to replace current testing & server setup to something of your preference.

Dataset

You can find the necessary dataset along with its description and documentation in the data directory.

Evaluation

We will use the following criteria to evaluate your solution:

• Capacity to follow instructions
• Developer Experience (how easy it is to run your solution locally, how clear your documentation is, etc)
• Solution correctness
• Performance
• Tests (quality and coverage). Some tests are already included and not working, these should be made pass by fixing code or changing the test.
• Code style and cleanliness
• Attention to detail
• Ability to make sensible assumptions

It is ok to ask us questions!

We know that the time for this project is limited and it is hard to create a "perfect" solution, so we will consider that along with your experience when evaluating the submission.

Getting Started

Setting up your environment

1. Install Node.js v14+.

Setting up the project

In the project directory run:

npm ci

Running the tests

The test suite can be run with:

npm run test

Starting the application

To start a local server run:

npm run start

it should produce an output similar to:

Server running at http://localhost:2345/suggestions