Is it possible to link Alexa to my own web application?

Ok as part of a project I'm looking to use a skill in Alexa which I will custom make using AWS Alexa skill kit.

I basically want to build a web application in which my users could customise to their own interests then based on the interests they could ask Alexa questions about this interest? Also I am looking to do this in languages other than english... Is this possible?

Also what would be the best approach to the web app side if I want it to store real time data?

Thanks in advance.