Thank the people (one note per each person) for taking the time to give you the opportunity to show your qualifications for the job. Let them know you have great respect for them. Be confident in the letter in saying you look forward to working with them if given the opportunity and that you know you can bring great things to the company if hired.
Do NOT summarize your resume all into the note. They know your qualifications for the job so do not list why they should hire you. There is no reason you should list your entire application all over again--this will only irritate the reader instead of bring a smile to their face.
If you do not have lovely handwriting then it may be more acceptable to type each letter. Remember to double check spelling and grammar to make a good impression. You definately do not want to come off as untactful and sloppy; however, you should definately hand-sign your name at the bottom of each card.
Remember to show that you know your boundaries and that the interview did not magically make you best friends. Do not overly assume in the letter that you nailed the job--it is not your job to decide that so do not say, "I look forward to working with you." Instead tack onto the ending, "I am looking forward to working with you if given the opportunity..." much like I explained above. In addition, remember to refer to the recipient as Mr, Mrs, or Ms--not Bob or Sally. [ Peeps's advice column | Ask Peeps A Question ]
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