20.03.2015, 11:13
Don't expect to work as a frontend developer, then. You don't have to use a heavy weight like Bootstrap, you can also use something simple like Unsemantic. The only thing you need is a very simple 23 kilobyte (even less if minified) CSS file (unsemantic-unsemantic-grid-responsive-tablet-no-ie7.css). Then add a few classes to your HTML page and you're done. CSS files are usually cached by the browser so there is hardly any performance impact.