Enterprise Account Executive, Slack

Reborn as Slack, the company was clearly onto something, as they became one of the fastest growing software business in the world. 8,000 people signed up to their waiting list on the first day, and within 2 weeks this number grew to 15,000.

Slack now have 12 million active users and over 100,000 paying customers, making then one of the best growth stories of the last decade. They're now moving from messaging into more general productivity software, taking aim at Microsoft Office.