URL Shortener

A short url application is used to created short links, aliases against a long url. They are generally used to share long urls over text messages and tweets.

Features

1. User should be able to create short links, by supplying a long-url.
2. Whenever a user clicks on a short link, it should redirect to the corresponding long-url.
3. User should be able to create customized short links, with max length of 6 characters.

System Design (Requirements)

1. Service should be always available.
2. Short to Long URL should be fast.
3. Service should be scalable.

System Design (Approach)

1. Use of load balancers to reduce SPOF.
2. Use of cache system to reduce database calls.