At the moment I am responsible for 5 projects of my company.
These projects are all based on Salesforce and I deal with the creation of custom solutions according to the customer's requests (development of both the backend and the frontend for each project).
For these projects I mainly use:
-Apex
-HTML
-CSS
-Javascript
-Visualforce
-Lightning Web Component
-Java
-SQL
-T-SQL
-SOQL