Frontend:
* CSS, CSS3, and SASD # I assume that is supposed to be SASS?
* Go # Why for a front end engineer? It's not even on the backend list.
* Python # Why? It's a nice to have for general scripting but not required for frontend work
Backend:
* C and C++ # Not generally important for full stack web dev
* Ruby on Rails # Why is Rails in the middle of a list of languages? The language is Ruby
* Perl # Why? may be useful but not a must know
* MySQL and NoSQL # Why is MySQL contrasted with NoSQL?