What does it take to grow ambitious start-ups into impactful businesses and foster diverse, inclusive leadership from the start? Roxanne Varza is director of Paris’s Station F, the world’s largest start-up campus. Previously head of Microsoft’s French start-up activity and named by Business Insider as one of tech’s 30 most influential women under 30, she tells Monocle’s Tom Edwards what it takes to be a Station F company and how to champion progressive change in the workplace.