The primary hurdle was a relentless 3-month launch window for the MVP. We had to solve a complex architectural paradox: Strategic Prioritization: We re-engineered high-value "Hero" journeys from scratch (The Dashboard Hub, Transfers, Payments) while applying a cohesive visual "reskin" to lower-priority legacy flows to maintain a unified user experience. Harmonizing Stakeholders: We acted as the bridge between an ambitious corporate vision and the technical realities of legacy banking back-ends, ensuring every design choice was both innovative and production-ready. The Foundation: A Scalable Design System To meet the 3-month deadline without sacrificing quality, we built a comprehensive Design System that served as the "single source of truth" for both designers and developers. Engineering the Library: We didn't just use a library; we transformed an existing foundation into a custom, high-performance system. We established a rigorous hierarchy using Montserrat typography and a vibrant, daring color palette. Design Ops & Execution: We implemented a "Design-to-Dev" workflow that ensured pixel-perfect implementation for native iOS and Android. RTL-Native Logic: A major feat was building the system to natively support Right-to-Left (RTL) layouts for the Arabic version, ensuring that components mirrored correctly without breaking the user's mental model.