Important Links

• Starter repository on GitHub

Important: How to submit your solution

• [ ] Edit By: <Name> from <Company> at the top of the README.md with your own details so I can match your submissions to your application/CV
• [ ] Create sensible Git commits
• [ ] Push your solution to a new private repository on GitHub
• [ ] Invite me to your repository so I can review the work: https://github.com/maximilianschmitt

Timeframe

Please complete the coding challenge within 7 days of receiving it. If you need more time, please let me know.

About the challenge

The coding challenge is an imaginary backend for a tipping feature. Users buy a virtual currency called tokens. Users sends tokens to other users as tips. Received tokens can be paid out to the recipient’s bank account.

Notes & tips

• You will need to maintain two separate balances per user:
  • tokensReceived: Tokens received via tips
    • These can be paid out
    • These cannot be sent to other users
  • tokensPurchased: Tokens purchased with real money
    • These cannot be paid out
    • These can be sent to other users
• Check src/routes/get-user.test.ts and src/routes/get-user.ts for a sample implementation, demonstrating:
  • Authentication
  • Using custom errors for consistent error responses
  • Using src/testing/testData.ts to add test data for tests
• You will need to modify the database schema. You can do this by editing src/schema.sql
• Implement proper input validation for things like query parameters and request bodies (where applicable). You’re free to use a library like zod or joi for this
• Make sure your SQL is safe against SQL injections and inconsistent database state
• Integration with a payment processor or third-party API is not required
• You can authenticate as a user by setting the Authorization: <UserId> header. This is not a production-safe setup but should make it easy to write tests etc.