Oh well, one thing I try to do is study a lot. I realised even if you could program well, it pays to know the buzzwords and how things under the hood really work, and that's what normally asked during interviews. I made it a goal to read a lot of books on Javascript, HTML5 and CSS3. I recently started learning data structures and algorithms, turns out this knowledge is useful not just as a programmer(sometimes, depending on what you do) it helps you when interviewing at big companies, especially if you want to get into one of the big 4 like I do :)