Hi Sandeep,
Hashnode its good initiative for Programming community. Appreciate you and your team.
I have some feature requests and Questions.
Feature Requests:

Questions:
Initially you have learned Angular but used React to bulid Hashnode , Why ? Is react better than Angular in speed ?
Hashnode UI looks similar to medium.com , Is this FLAT design or Material design ? and What UI technology has been used for UI design ?
What makes Hashnode fast ? is it because of NodeJS and React or because of high end cloud edge servers or caching servers ?
:)