Design a system for a mobile banking app that lets users schedule recurring payments and manage multiple accounts. How would you architect the UX to ensure scalability, accessibility, and user trust?

Use the CIRCLES framework: 1) Context – define user personas and business goals. 2) Input – gather data on current pain points and regulatory constraints. 3) Requirements – list functional (recurring, multi‑account) and non‑functional (scalability, accessibility) needs. 4) Constraints – technical stack, API limits, security standards. 5) List – brainstorm feature set (account aggregation, payment calendar, confirmation flows). 6) Evaluate – apply RICE scoring to prioritize features. 7) Summarize – outline the high‑level architecture: modular micro‑services for payment processing, a shared design system, and an accessibility audit plan. Emphasize iterative prototyping, A/B testing, and continuous monitoring of key metrics.

I would begin by defining the user personas—frequent travelers, small business owners, and retirees—and their goals: quick, secure recurring payments across multiple accounts. Using the CIRCLES framework, I’d gather data on current pain points and regulatory constraints, then list functional requirements (account aggregation, calendar scheduling, auto‑retry) and non‑functional ones (scalability, accessibility, trust). Constraints include API rate limits and PCI compliance. I’d brainstorm a feature set: a unified account view, a drag‑and‑drop payment scheduler, and a confirmation modal with trust badges. Applying RICE scoring, I’d prioritize the scheduler and trust signals. The architecture would be modular: a payment micro‑service, a shared design system, and an accessibility audit pipeline. I’d prototype in Figma, run usability tests, and iterate based on metrics like completion rate and error rate. Finally, I’d monitor key KPIs—scheduled payment volume, churn, and support tickets—to validate success.