I started using Parse for my app and as I code I am starting to realize how painful it will be to move away from it in future. It would mean a complete rewrite of the app. Now, if they have problems like these (down due to certificate expiry), I am not sure what value I will get out from this service. Also, it is taking more time for me to learn their SDK than I thought, as I am beginning to write complex queries and relations. I encourage people to write data services on their own.