/backend-assignment

Take home assignment

Description:

Build 2 Backend services which manages user’s accounts and transactions (send/withdraw).

In Account Manager service, we have:

  • User: Login with Id/Password
  • Payment Account: One user can have multiple accounts like credit, debit, loan...
  • Payment History: Records of transactions

In Payment Manager service, we have:

  • Transaction: Include basic information like amount, timestamp, toAddress, status...
  • We have a core transaction process function, that will be executed by /send or /withdraw API:
function processTransaction(transaction) {
    return new Promise((resolve, reject) => {
        console.log('Transaction processing started for:', transaction);

        // Simulate long running process
        setTimeout(() => {
            // After 30 seconds, we assume the transaction is processed successfully
            console.log('transaction processed for:', transaction);
            resolve(transaction);
        }, 30000); // 30 seconds
    });
}

// Example usage
let transaction = { amount: 100, currency: 'USD' }; // Sample transaction input
processTransaction(transaction)
    .then((processedTransaction) => {
        console.log('transaction processing completed for:', processedTransaction);
    })
    .catch((error) => {
        console.error('transaction processing failed:', error);
    });

Features:

  • Users need to register/log in and then be able to call APIs.
  • APIs for 2 operations send/withdraw. Account statements will be updated after the transaction is successful.
  • APIs to retrieve all accounts and transactions per account of the user.
  • Write Swagger docs for implemented APIs (Optional)

Tech-stack:

  • Recommend using authentication 3rd party: Supertokens, Supabase...
  • NodeJs/Golang for API server (Fastify/Gin framework is the best choices)
  • PostgreSQL/MongoDB for Database. Recommend using Prisma for ORM.
  • Docker for containerization. Recommend using docker-compose for running containers.

Target:

  • Good document/README to describe your implementation.
  • Make sure app functionality works as expected. Run and test it well.
  • Containerized and run the app using Docker.
  • Using docker-compose or any automation script to run the app with single command is a plus.