"Pie Bank isn't a best-guess interface. Every conditional flow, every balance calculation, every biometric trigger behaves exactly as specified. That's the difference between a prototype that looks right and one that proves the product works."
"When a prototype carries real variables, live math, and conditional flows, that gap closes. The prototype becomes the specification. Fewer engineering assumptions. Fewer revision cycles."
Pie Bank is a prototype developed in ProtoPie that mimics real app behavior, including login validation and balance updates. It incorporates precise interaction logic, ensuring every function operates as intended. The prototype serves as both a visual reference and a specification, reducing engineering assumptions and revision cycles. It features four core interaction areas, each explored in detail through tutorials. The series emphasizes the importance of validated interaction logic and user testing in FinTech design workflows, enabling effective stakeholder engagement and decision-making.
Read at ProtoPie
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