<human>: Can you provide a brief overview of the text?

Really appreciate all the advice is this sub and finally have a question of my own. 

An organization I volunteered with earlier this year in the spring is hiring for a position which I am pretty certain that I am qualified for. As part of volunteer training and debriefing, we had a lot of interaction with both the volunteer coordinator and the director of the organization. The coordinator, who was my manager in a sense, is someone I would definitely use as a reference for any other job, for instance. 

What is the etiquette or best way to go about contacting them about the posting? I want to let them know that I am seriously interested and re-establish our connection, but I don't want to seem too aggressive and "brown-nosey" or annoying. Is it better just to send my cover letter/resume in as suggested and mention in the e-mail that I previously volunteered and blah blah?
<bot>: an organization I used to volunteer with is hiring, wondering how to approach ppl I know within the organization about the posting to show interest but not be annoying.