Backend Challenge

Description

This app is using:

• PostgreSQL for Database
• Yarn as package manager.
• NestJS as Framework.

Assumptions & Comments

• The solution is architected to store common values on database, for example: Countries, Same IP Trace. So if someone make the same requests with a gap of a few seconds, we only need to go one time to the provider.
• For currencies, I'm saving values for a fixed (configurable) amount on minutes.
• The model supports country with multi-currency, but because ip-api return only the official currency for a given country, I only get that value.
• In a real world scenario, it's preferable to add a first layer of cache on something like redis.

Installation

$ yarn install

Running the app

Copy file .env.sample to .env and update values to match your environment.

# development
$ yarn start

Test

# unit tests (only one in this case)
$ yarn test

# e2e tests (both REST endpoints)
$ yarn test:e2e