The pros by far outweigh the cons, but just to be transparent with anybody who is considering joining FundApps as a (senior) Client Success Manager:
In my understanding, FundApps is (currently) purely organic and funded only through growth i.e. boot-strapped with no invested money. This means they are very cost-conscious and are not trying to be competitive in terms of monetary compensation - at least not in the client services team. I believe they aim for the median industry-wide salary, and this is not in FinTech where I would expect a higher than average, but just in general. However, I would say that this is partially offset by their various non-monetary benefits. BUT, if you are coming from a bigger SaaS or from many other places in Finance, you will likely have to take a pay-cut to be part of FundApps (guessing ~30-50% depending on your circumstances).
DON'T join FundApps for money. Join FundApps for Love <3