Software Enginer? Depends... Do you want to become a Front End Developer? Back End Developer? Senior Developer? Or other?
Options For the three i listed
Front End Developer:
Back End Developer:
There is many options for this... You can go into PHP/MYSQLI , Or Node.js with Angular Node bieng the backend.. Express.Js, Socket.io. Php Frameworks Including Laravel.. MEAN.IO/ MEAN.JS.. MongoDB For your Database. And much more im not aware off.
To be a senior developer im preety sure you have to be Really good with Back End and Front End.
And Much more types of Developers im not aware off...
I would highly reccomend you go here