I follow the principle of trying to be (and hire) T shaped people. Wide generalist knowledge (knows a little of everythin) but one topic where they go deep. You

I follow the principle of trying to be (and hire) T shaped people. Wide generalist knowledge (knows a little of everythin) but one topic where they go deep. You can be specializing in backend programming but I would expect you to be able to hack a quick front end fix. You can't get away without the minimum of basic HTML, CSS, JavaScript, SQL and Linux, you also must know basics of security (CSRF, XSS, SQLI etc). Then you can go deep on anything you want.