• web: Frontend - Next.js app
• api: Backend - Nest app
• redis: Caching service used by backend

To build all apps and packages, run the following command:

docker-compose build

To run all apps and packages, run the following command:

docker-compose up -d

• Issue:
  • Cryptonator API is being blocked by Cloudflare browser checking so the application cannot directly fetch from that source
  • Solution: A flexable implementation which allow another provider
  • Enhancement: Since another API may not provide Change data require, a possible solution is to implement a data storage and calculate the Change data ourselves
• Caching:
  • Use Redis as the Caching service to minimize the number of calls to third party API
  • Use TTL 30 seconds which matches the refreshing time of third party API
  • Need to improve the handling if redis service is down
• Scalability:
  • Currently it is using Docker Compose to run apps, ideally using k8s can minimize changes to apps/containers but provide the scalability, i.e. multiple backend services can be run
• Data storage:
  • Currently the application does not use any database service as it is depending on pass through data, if past data will be needed that we should add a database

The implementation started at 23 Feb and completed on 27 Feb. Average hours worked per day is 2 - 3. Some blockers faced;

• Cryptonator API is not a reliable source in my case, need to research another API source
• This is the first time I used Turbo and Next.js. Blocked by creating an optimized build with Docker