SaaS Cohort Analysis

This problem practices a common SaaS interview concept, how to group customers into cohorts and interpret the patterns that emerge over time. It tests whether a candidate can explain how companies use shared traits such as signup date, product tier, or customer segment to compare behavior, diagnose retention trends, and form hypotheses about what drives customer actions. Interviewers ask this because cohort analysis is a core tool for understanding churn, customer lifetime value, and which initiatives may improve retention in subscription businesses.