This is more so applicable for tech positions. Candidates do make mistakes but techies are more prone to making interview blunders. If you are careful about certain basic things, you have a great chance of getting the job.
Here are 10 points.
Dress Well - Appearance is very crucial for any interview. It matters a lot to the employers when they interview potential candidates. They expect the candidates to be dressed for the interview. It is a good idea to check with your recruiter or any company connection about the dress code of the office. Although the trends have changed and casual dressing is acceptable, it is always better to dress a little conservatively.
Attitude - Techies generally are not very good with communication and often come across as arrogant in interview. They are very qualified and good in their job but are generally not good with words. Try to work on this aspect and make an effort not to sound arrogant when you talk.
Don't overstate your Skills - Your Skills are important. In fact you are there for the interview because of your technical skills. But be careful that you don't overemphasize your skills. Your credentials and certifications matter but along with this you should have the ability to serve the organization. Apart from your skills your other qualities should also come out in the interview. Your thought process and your ability to handle tasks are also important.
Communicate well - You may be able to give crisp and direct answers to technical questions but interviewers often want to have more communication on open-ended questions. Work on your communication skills so that you are able to strike a conversation. Just giving brief answers may not work because the interviewer may want to evaluate your thinking process.
Be Prepared - There is no excuse for not being fully prepared for the interview. Do your homework really well and be thoroughly prepared. Your research on the company should be so thorough that you are able to ask intelligent questions about the company.
Show Interest - Ask questions about the company. This will show your interest in the company. More than your skills companies also appreciate candidates who display intellectual curiosity. Your interest in the position and company should be very evident. And this you can easily convey by doing proper research and asking intelligent questions.
Avoid Questions on Perks - Perks will come with the package. You can enquire about it later from the HR after you are employed. Don't ask mundane questions about parking, coffee allowance or any other such benefits.
Be Formal - Never take interviews to be casual affair even if the interviewer sets a casual tone. Casualness can often be misunderstood as lack of interest in the position.
Be Positive - You may have had a bad experience in the past. Never bad-mouth your past employers in the interview. It will convey wrong signals to the interviewer. Always talk positive.
Learn to Conclude - Always end your interview with a closing statement. You can tell them your keenness to join the firm. You can also ask them about the next step in the complete hiring process.