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ATM Coding Challenge

We are going to build backend, frontend, or data tooling for a publically available Geo resolution API, GeoJS. We will use this API to retrieve the country and city associated with any IP address.

We are looking for the following

  • Design choices
  • Coding style, quality, and readability
  • Testing
  • Documentation around design trade-offs you made, or any other considerations you want to call out
  • Bonus: Edge cases and completeness

This should not take you more than 2 hours. When you are done, push your solution to a public Github repository (preferred) or share a .zip file.

Backend Challenge

Build a REST API (Ruby on Rails preferred) that allows users to submit IP addresses. Fetch the country & city from GeoJS and store the results in a server memory cache. The IP addresses and their data should not be persisted to a database. A second end point should allow users to see all previously queried IP addresses alongside relevant data. The user should also be able to filter these IP addresses by country & city. Each API should return JSON.

Frontend Challenge

Build a standalone frontend app using GatsbyJS that allows users to input an IP address. You can retrieve the country & city from GeoJS and show them on the page. The page should show all the input IP addresses and the country & city associated with them.

Data Engineer

Build a python script that reads a list of IP addresses from a file. Fetch the country & city from the GeoJS endpoint and write out these IP addresses to file by city & country. Each file name will be the country name (or city name if its by city), and will have a list of IPs that belong to that city.