Airwallex Interview Questions

Airwallex does its data science hiring onsite: 11 of these 22 questions were asked in an onsite round rather than a phone screen, and 11 come from Data Scientist loops. Analytics and experimentation is the dominant topic at 6 questions, and the recurring problem is measurement without a clickstream. Two separate questions ask how you would measure billboard impact and how you would test billboard effectiveness, which pushes you toward geo holdouts, difference-in-differences and brand-lift surveys rather than a clean randomised test. Payments enters directly through a question on diagnosing a dip in approval or conversion rate, where a good answer separates issuer declines, fraud rules and checkout friction before blaming the funnel. The page is mostly prose rather than code: 10 of the 22 questions already have a written solution and only 3 open a console, with 67 percent free to read. What remains rounds out the loop, a bootstrap exercise on estimating a mean and its variance, a trust-and-safety investigation into a surge in harassment reports, and a behavioural round on resolving stakeholder conflict.