I'm using Perl (with Mojolicious) for backend in various applications, I posted something about it in Re^3: Constructive thoughts on Dancer2 v Mojolicious. Also, i'm using Perl to make various small utilities, when you need process a lot of data, getting it from text/csv/sql and putting result to text/csv/sql. I don't see anything near as simple and powerful as Perl for those tasks.