The company doubled in size since the IPO and a change in top level leadership (CTO on down) brought all the negatives of the Amazon culture (abrasiveness, negativity, pressure, unrealistic expectations, unhealthy internal competition, insensitive management, criticism over constructive feedback, no work/life balance). Lots of people cashing out after options matured. Read the gory details on teamblind.com. The eng leadership attitude is that you should always be hiring (since they expect plenty of turnover).