Advanced UI/UX Design for SaaS Platform

We are building a premium SaaS platform currently in active development and need an exceptional senior Product/UI/UX Designer to create a reusable Design System v1.0. The goal is to make sophisticated, feature-rich software feel exceptionally simple, intuitive and premium — Apple-like simplicity on the surface, serious capability underneath. We need a developer-ready Figma design system covering visual language, UX principles, typography, spacing, navigation, components, responsive behaviour, light/dark modes, approximately six curated user-selectable colour moods, interaction patterns and contextual AI/intelligence UX. The system should be demonstrated across representative desktop, mobile and tablet experiences. This is not a logo project, development role or redesign of every application screen. Our existing technical lead and frontend developer will work alongside the designer and implement the system. Expected engagement: approximately 10–14 days. Please propose your own fixed price, timeline and exact deliverables.