I agree with every advice given here, I'd just add that you need to be proactive: in some interviews you'll be given a very lax list of requirements and that means that your capacity for risk assessment is being tested, you need to ask questions so that those very lax requirements slowly become very specific requirements. Risk assessment also play a part when you're determining scaling, security, and deployment concerns, and you win a lot of points by at least mention them, that's what is expected of you as an engineer with experience. Maybe you're interviewing for a junior position and the interviewer will say "don't worry about that for now", but what if he's expecting you to worry and you didn't?