I am a Python/Django guy and have worked in organizations where it is used extensively.
I did complete the challenge successfully. After successful completion of the coding challenge, had an HR call. I was told by HR that I would be getting information about next rounds in few days.
And bam! a reject! That too without any feedback(even though I asked for it)
I know the product is awesome, and you guys are doing a great job; but I was a bit disappointed for not getting the reason of reject.
Sounds like they callously burned through your time. Sorry to hear about your experience, but it's good that you shared so that others know what to expect when applying for a role at this company.