Subjects

Case Study: Redesign a Checkout Flow

Model interview answer for the live design-interview prompt 'checkout has a 68% abandonment rate at the payment step — walk me through your approach' in 20 minutes: the clarifying questions that separate a strong candidate from a guesser, framing the problem as a Double Diamond Define step, generating and prioritizing distinct hypotheses for payment-step-specific drop-off, sketching a redesign tied to named interaction and visual design principles, and choosing a validation method sized to the time available.

Design Metrics and Product Thinking

Covers Google's HEART framework and its Goals-Signals-Metrics companion process, the business metric vocabulary designers need (conversion funnels, activation, retention/churn), North Star metrics and how they should shape design prioritization, reasoning about design quality vs. shipping velocity as a cost-of-being-wrong tradeoff, techniques for quantifying UX impact to win stakeholder buy-in, and the risk of over-optimizing for a metric that's a poor proxy for the real goal — including where that risk shades into manipulative, dark-pattern territory.

Case Study: Design a Mobile App From Scratch

The capstone of the UI/UX Design Interview track: a complete model answer to 'design a mobile app that helps people find and book last-minute fitness classes near them' worked exactly as a candidate would in a 30-40 minute whiteboard interview — clarifying questions, JTBD over persona framing, an explicitly scoped MVP, bottom-tab information architecture, wireframe-level screens with Fitts's/Hick's Law reasoning, empty-state and booking microcopy, map-accessibility considerations, HEART success metrics, and a closing risk statement — synthesizing personas/JTBD, IA and navigation, wireframing, interaction design, UX writing, accessibility, responsive design, and metrics from earlier in the track.