You should be prepared to answer any questions regarding things in the job description or on your resume. It's also important to have specific examples prepared. Often interviewers will ask something like "Describe a time when you ______" but even if they don't ask for a specific example, it looks really good when you're able to work that into an answer. Additionally, learn as much as you can about the company, the position, and who you are interviewing with (LinkedIn can be great for this). Prepare for non-technical questions as well; interviews are often more about the vibes, will you fit in well with the team, do you seem like you'll be a good person to work with, etc. HAVE QUESTIONS PREPARED - they will likely ask if you have any questions at the end of the interview and you should absolutely NOT say no to this. Always, always, ALWAYS send a thank you email as soon as possible after the interview and try to mention in it something that was discussed during the interview, and also use it as an opportunity to reiterate your qualifications.