2 answers published. Last candidate submission on Mar 4 2026, 12:07am PDT. Interview question asked to Production Engineers, Engineering Managers, Site Reliability Engineering Managers and other roles interviewing at Buffer, Tink, Boston Scientific and other companies. Original question asked: Design a system for real-time processing of user authentication requests.. Question last reported by a candidate interviewing at Amadeus for a Machine Learning Engineer interview on Jul 29 2026, 8:50am PDT.