Sounds to me like perl and mojolicious would handle your processes just fine.....and do it fast. I have done many projects that involved processing csv files doing something with the data and then saving to a database or another format. I have found that perl does this type of thing very well. There are many modules in cpan for working with csv/excel.

Mojolicious has plugins to get you running with roles very quickly as well (ie: operator status etc)...https://metacpan.org/pod/Mojolicious::Plugin::Authorization comes to mind. Good luck and i hope you enjoy the framework as much as i do.