- start with business problem, end with impact with numbers and recommendation - show tradeoff reasoning - position self clearly before interview: product or marketing DS - when coding, say **what else** methods can use - talk about **edge cases** - don't talk back and forth, pause is better than unstructured answers - hard and strong personality showing senior-level - mention key terminology, don't have to include all details - Answer structure - result first. Start with outcome in one sentence such as "I ran an A/B test that improved project creation by 12% while protecting D7 retention rate" - one-context to show tradeoff reasoning - challenges - action - interesting findings - answer in 60-90 seconds, terminology in tech or hire manager round - prepare specify why this company questions - reduce filler speech, a pause shows more confident that filler words, slow down before talking - use "I" instead of "we" - position self correctly based on job description and only say relevant projects - **when name the metric**, follow the definition methods (free-to-paid conversion or upgrade conversion within xx days among new / existing users) - do mock interview for business case for each company using main data metrics, and think about business type in **which categories** (B2B company won't focus on familiarity of their own product, B2C and product-driven company will need product familiarity and need more research on them, big tech company will do both but we are already familiar with them) - live interview case study, practice stress speech - focus on **one hypothesis and go deep** to show technical depth and strategy influence - always first say structure then say answer