Scalable Tracking Number Generator API

Functional Requirements

• The generated tracking number must satisfy the following:
  • It must match the regex pattern: ^[A-Z0-9]{1,16}$.
  • It must be unique; no duplicate tracking numbers should be generated.
  • The generation process should be efficient.
  • The system should be scalable, capable of handling concurrent requests, and should be able to scale horizontally.
• The API should return a JSON object containing at least the following fields:
  • tracking_number: The generated tracking number.
  • created_at: The timestamp when the tracking number was generated (in RFC 3339 format).
  • You may include additional fields in the response if you see fit.

Non-Functional Requirements

• Efficiency & concurrency: The solution should be optimized for high performance and be capable of handling multiple concurrent requests without degradation.
• Scalability: The solution should be designed to scale horizontally across multiple instances.