1 answer published. Last candidate submission on Apr 30 2026, 7:19am PDT. Interview question asked to ML Engineering Managers, Engineering Managers, Production Engineering Managers and other roles interviewing at Fitbit, Headspace, Skyscanner and other companies. Original question asked: Design a secure transaction system for online shopping.. Question last reported by a candidate interviewing at Grab for an Engineering Manager interview on May 18 2026, 3:41am PDT.