People too often don't sell themselves during the interview process. Put yourself in the hiring managers shoes - if you had a choice between two candidates and one said - "I think I can do the job" and the other said, "Yes I can do the job and here's where I've done things that are similar in the job description".  Who would you choose? You can sell skills and abilities with confidence with out being arrogant. Companies want to hire people that are confident that they can do the job. This means less training and quicker productivity which translates into contributing to revenues. Make sure your prepared going into the interview to tell the hiring manager why you are the right fit and have plenty of relevant examples.