How to Scale a Startup

In literally five, maybe five and a half years, you went from idea to being a unicorn. And at every stage, it sounds like you had a fundraising goal in mind. When you were raising money, you had a valuation target that you were aiming for. It must have been quite the ride. Tell me about hiring and scaling. How do you put a method to the madness of scale when he comes to hiring? And how do you?