Jeff Li, a senior data scientist at Netflix and former data science manager at Spotify, discusses ads forecasting, career paths as a manager vs IC, and the culture differences at Spotify, Netflix, and Doordash. They also talk about the challenges of forecasting in finance and ads, detecting and accounting for seasonality and black swan events in advertising, transitioning from manager to senior data scientist, comparing company cultures, changes in tech stacks and data visualization tools, the future of forecasting, the importance of mentors in career growth, and the role of communication skills for data scientists.