Turns out getting a production site up and working has little to do with finding the k-th permutation...

I laughed out loud at this one after reading all the serious, in-depth posts above.

Hi belzebub, Co-founder here. Can you send me more details at fahim {-at-} educative.io?

Down for me too, just run the app in mobile safari. Works on Firefox OSX.

We've found an issue with Safari Private Mode (OSX and Mobile). Thanks for letting us know.

I didn't observe the problem but I'm curious -- what property of the Private mode caused your bug, can you share?

Sure :). We are using local storage to cache some information and apparently local storage is not available in Safari's private windows.

FWIW, that is a fairly known frontend issue :) . One cannot rely on that returning any data.

Haha yes it's a learning phase for us. We are a team of 3 who spent last ~10 years programming backends in C/C++. So we are learning Web Technologies and fairly known frontend issues are new to us.

Another co-founder here. +1 on us being beginners on Front-end technologies.

To be a bit more specific about this issue we are actually using an outdated version of a dependency 'pace' that uses local storage (they have taken it out in new version) so hopefully with an upgrade this issue will be resolved. Based on your feedback we will make sure to prioritize fixing this.