Creating a fully functional like-button (potentially with Jetboost)

Hi everybody,

I would like to implement a “Like”-button into my project through which everybody can see the number of likes given by all users combined to a post and then like and unlike themselves. I found a promising implementation of that using Jetboost, however when testing it I noticed one problem: If multiple users like at the same time, likes get cancelled, the total number of likes gets messed up and the whole idea of the like-button is undermined a bit.
Does anybody know a solution to this problem? As I have already used all 30 fields in my CMS, a solution not requiring any extra fields would be best.
Thank you so much in advance!