Any courses/advice for a Mobile Dev transitioning to Backend Dev?

[patdev]

Basically the title. I'm currently a Senior Android Dev, but I'm tired of the AS issues .
I want to learn and build a portfolio to transition into Backend Development. Any advice or course recommendations would be appreciated.


Thanks!

 

[toofanSingh]

following

 

[patdev]

up

 

[elbot]

I'm interested in the recommendations...