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A local proxy for Forex rates

Build a local proxy for getting Currency Exchange Rates

Requirements

Forex is a simple application that acts as a local proxy for getting exchange rates. It's a service that can be consumed by other internal services to get the exchange rate between a set of currencies, so they don't have to care about the specifics of third-party providers.

We provide you with an initial scaffold for the application with some dummy interpretations/implementations. For starters we would like you to try and understand the structure of the application, so you can use this as the base to address the following use case:

An internal user of the application should be able to ask for an exchange rate between 2 given currencies, and get back a rate that is not older than 5 minutes. The application should at least support 10.000 requests per day.

In practice, this should require the following 2 points:

  1. Create a live interpreter for the oneforge service. This should consume the 1forge API, and do so using the free tier.

  2. Adapt the rates processes (if necessary) to make sure you cover the requirements of the use case, and work around possible limitations of the third-party provider.

  3. Make sure the service's own API gets updated to reflect the changes you made in point 1 & 2.

Some notes:

  • Don't feel limited by the existing dependencies; you can include others.
  • The algebras/interfaces provided act as an example/starting point. Feel free to add to improve or built on it when needed.
  • The rates processes currently only use a single service. Don't feel limited, and do add others if you see fit.
  • It's great for downstream users of the service (your colleagues) if the api returns descriptive errors in case something goes wrong.
  • Feel free to fix any unsafe methods you might encounter.

Some of the traits/specifics we are looking for using this exercise:

  • How can you navigate through an existing codebase;
  • How easily do you pick up concepts, techniques and/or libraries you might not have encountered/used before;
  • How do you work with third-party APIs that might not be (as) complete (as we would wish them to be);
  • How do you work around restrictions;
  • What design choices do you make;
  • How do you think beyond the happy path.