A personal friend whom I have known well for many years has asked me to provide him with a written letter of recommendation for a entry level position he is interviewing for. As I have never written a such a formal letter before, how should I go about doing this? I understand that a well written letter can really make a difference in being successfully hired. He is looking to work in investment banking and the firm he is applying to is extremely competitive / difficult to get into.
He has many praiseworthy traits such as a good team player, loyalty, and reliability, all positive traits of an employee
For the experienced hiring managers on this community, how would you go about writing this letter and what are some points of relevance I should emphasize? I only have the best of intentions for my friend's career success and a well written letter might considerably elevate his candidacy.