How would you layer the architecture of backend interaction: data retrieval, validation, storage, and retries on error?

The architecture of interaction with the backend can be divided into the following layers:

1. Data Fetching Layer

   • Responsible for sending HTTP requests to the backend.
   • Uses fetch, axios, or another library.

2. Validation Layer

   • Checks the correctness of the received data.
   • May include schema validation (e.g., with Yup or Joi) or custom logic.

3. Storage Layer

   • Manages the application's data state.
   • Can use Redux, MobX, Context API, or local state.

4. Retry/Error Handling Layer

   • Catches network request or validation errors.
   • Implements retry logic with exponential backoff or a fixed number of attempts.

Approximate scheme:

Frontend UI
   ↓
Data Fetching Layer → Validation Layer → Storage Layer
   ↑                             ↓
   ←--- Retry/Error Handling Layer ---

This separation helps keep the code clean, facilitates testing, and reusing logic.