The growth teams at Uber and Airbnb occasionally met over the years to share best practices, brainstorm ideas, and share observations on the startup world. I’ve had folks over to 1455 Market St, the headquarters of Uber, and I’ve reciprocated with visits to the Airbnb offices too. I’ve learned a ton from these conversations, and met awesome people along the way! Today, I have a wonderful guest essay to share by Lenny Rachitsky (@lennysan) — he’s recently left Airbnb after 7 years, much of his recent years as the product leader on Supply Growth.