IntermediateSITUATIONAL
Imagine marketing wants to add a promotional banner and a sign-up modal to a critical checkout flow, and your usability tests show a drop in completion rate. How would you handle this situation from discovery through to final design decision?
UI/UX Designer
General

Sample Answer

Context: At General, our growth team asked to add a 20% off banner and an email capture modal into our highest-revenue checkout flow. An initial unmoderated usability test (UserTesting + GA funnels) showed checkout completion dropping from 72% to 61%. Action: First, I framed it as a shared problem: "How do we keep the promo value without hurting revenue?" I pulled a quick triage dashboard in GA and Amplitude to isolate impact by device and traffic source, and ran a 5-user moderated test focusing on hesitation points. We found the modal was interrupting intent at the payment step and the banner looked like an ad, triggering banner blindness and distrust. I ran a design spike with three variants: (A) inline promo in cart summary, (B) exit-intent modal at cart, (C) post-purchase sign-up on confirmation screen. I partnered with marketing to define success metrics: maintain at least 70% checkout completion while adding +8–10% email capture. We set up an A/B/C test via Optimizely. Result: Variant C won: checkout completion rebounded to 73% (+12% vs. degraded flow) and email capture increased by 14%. We documented the pattern in our growth UX guidelines: "No disruptive modals past shipping step; promos integrated, not overlaid, in critical flows."

Keywords

Show collaborative mindset with marketing while still advocating for the user and revenueDescribe specific discovery methods (analytics, moderated tests, funnel analysis)Explain how you generate and compare multiple design variantsMention concrete tools (e.g., GA/Amplitude, Optimizely, UserTesting) and exact metricsDemonstrate data-driven decision making and a clear success thresholdHighlight how the outcome informed reusable guidelines or patterns
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