Name for me one skill mentioned in our job posting, that you do not possess. How will you gain that skill?

The interviewer is asking for you to highlight your weaknesses. There are many ways to ask 'what is your greatest weakness'; however, the interviewers at MailChimp will always have a more thought-provoking way of asking this question. Before your interview, comb through the job posting and pick out a skill where you have room for improvement. Then, discuss what you could do to strengthen that particular skill.