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Lack of standrise of technical and competeny questions.
Being on my experience as a candidate, as an observer and as a recruiter are;
1. Initialing the interview without greeting/salutation/ giving them comfort zone to speak.
2. Some recruiter are too direct on telephone and ask them to appear for an initial session without guiding them proper address (though sending an email or Google map snap shot is good practice)
3. Never delay the interview session for more than10-15 minutes, doing such could manipulate candidate’s energy and negative image about firm.
4. Having little details about the position and yes HR must groom them in gaining technical knowledge which enhance recruiter image and for future reference.
5. Don’t conclude the session spontaneously, always ask candidate to have any query regarding session, job or organization and do address it professionally.
There are other tips too but the above one are few common.
PS: If you think you or concern technical heads are busy then do ask about tea/coffee to your candidates, after all, it’s your image also.