MailChimp has grown from a small company to serving millions of micro-businesses, in addition to SMBs and Enterprises. We have a fairly pedestrian approach to MySQL, but we now run hundreds and perhaps soon to be thousands of MySQL instances. Our present state is thanks to great full-stack engineering teamwork. This is a glimpse into what makes Mailchimp tick. Hint, it's not just technology. This talk is about "Momentum" and "Pragmatism", and creating a great outcome for our mission of empowering the underdog.