MuchBetter Technical Assignment

The task is to create a service that represents a simplified version of the MuchBetter e-wallet app!

We expect the assignment to take around a week to complete. Feel free to use any addiotional depedencies/libraries you like. The assignment should include unit and integration tests, not a full test suite but at least a few good examples. Dockerising the service is optional but encouraged.

Technology Stack

• Language Java
• Framework Ratpack
• In-Memory datastore Redis

API

The service needs four REST endpoints.

Login

Accepts no input and returns a token. The token will need to be supplied in the Authorization header in subsequent requests. Every call returns a new token and creates a new user, the user should be created with a preset balance in a preset currency.

POST /login

Spend

Accepts an Authorization header and a JSON body representing a single transaction.

POST /spend

{
    "date": "2022-01-01",
    "description": "Coffee",
    "amount": 10,
    "currency": "EUR"
}

Balance

Accepts an Authorization and returns the current balance along with the currency code.

GET /balance

{
    "amount": 100,
    "currency": "EUR"
}

Transactions

Accepts an Authorization header and returns a list of transactions.

GET /transactions

[
    {
        "date": "2022-01-01",
        "description": "Coffee",
        "amount": 10,
        "currency": "EUR"
    }
]

Submission

Please upload your finished assignment to either GitHub or GitLab and share the repository link with us via email. Don't squash your commits, it's nice to see how the project develops. Have fun!