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 You've spent days searching through job ads and crafting the perfect resumes and cover letters. Now you have a job interview scheduled. You're just steps away from your dream job, and in that interview, you're going to wow them.

You may know what to do during an interview. Do you know what not to do? No matter how much you impress your interviewer in other ways, these deadly job interview and pre-interview mistakes could kill your chances of being hired.

Being Unprepared

Research the company beforehand, on its website and elsewhere. Read reviews about them on Glassdoor and Yelp.

Study job ads the company has posted. You can learn a lot about the company from job descriptions and requirements for other jobs, not just the job you're applying for. Search local job boards as well as the large aggregator sites like Monster and Indeed.

Avoid being embarrassed. Examine your own online presence well before the interview. Potential employers often do online searches of job candidates, including their social profiles. Unprofessional screen names, posts bad-mouthing an employer, and inappropriate photos could all lower your standing or eliminate you from the running. Clean up your profiles.

Bring several copies of your resume to the interview - you never know who might want one. Bring your list of references, neatly formatted. Bring directions to the interview and your contact person's name and phone number.

If you might be late for a reason beyond your control, a call to that person could salvage the interview for you. Bring your ID and anything else that the interviewer requests that you bring.

Appearing Disengaged

Your words may indicate that you're the one to hire, but your body language might contradict your words. Crossed arms, leaning too far back or forward, poor eye contact, distracting movements, and other body language can make you appear detached. To learn more, see Body Language Tips for Your Next Job Interview.