•Designed a "Social Proof" feature for Netflix mobile to solve a solvable UX problem costing users 5 full days (110 hours) per year in decision time. •Leveraged behavioral psychology and data analysis to define a new content discovery framework, focusing on relevance over volume to drive higher "longevity stickiness." •Developed a strategic PRD that prioritized high-confidence data signals (9/10 completion rates) to earn user trust and decrease browse-to-play friction.