Service should be able to create shortened url/links against a long url
Click to the short URL should redirect the user to the original long URL
Shortened link should be as small as possible
Users can create custom url with maximum character limit of 16
Service should collect metrics like most clicked links
Once a shortened link is generated it should stay in system for lifetime Non-Functional Requirements:

Non-Functional Requirements:

Service should be up and running all the time
URL redirection should be fast and should not degrade at any point of time (Even during peak loads) _ Service should expose REST API’s so that it can be integrated with third party applications