Like Razor said, razor shaving and a buzz is the same perceived by most to be the same thing. Most guys that shave do so because of the feel, not the look. And facial hair does help balance a shaved/buzzed head. So going for your interview with a neatly trimmed beard and you buzz cut is fine. IF you are concerned about razor burn, do not razor shave the day before your interview - if you want to try it, do it when you do not have interviews scheduled to avoid a red head from razor burn or nick and cuts.