How will you evaluate the requirements for the notification service (Email, SMS, Telegram)?

To assess the requirements for the notification service:

1. Define delivery channels: Email, SMS, Telegram — each has its own features and limitations.
2. Find out the volume and frequency of messages — this affects load and scalability.
3. Requirements for reliability and delivery guarantees — for example, acknowledgment of receipt, retries.
4. Personalization and message format — templates, multimedia content.
5. Security and confidentiality — encryption, spam protection.
6. Integration with other systems — API, message queues.
7. Monitoring and logging — tracking delivery statuses and errors.

Based on these points, you can develop technical requirements, evaluate architecture, and choose suitable technologies.