Unified App & Web UI Design

I need a fresh, cohesive design for both a mobile app (to be released on iOS and Android) and its companion website. The visual language, navigation flow, and brand touch-points should feel consistent across every screen size—phone, tablet, and desktop.

Here is what I’m after:
• High-fidelity UI mock-ups for the full app journey on iOS and Android.
• Responsive website layouts that mirror the app’s look and behaviour.
• All source files neatly organised (Figma, Sketch, or Adobe XD are fine).
• A clickable prototype so stakeholders can experience the flow before development begins.

Please factor in common usability standards for both platforms, supply assets in export-ready formats, and include at least one revision cycle so we can fine-tune the details. If you have a portfolio showcasing similar multi-platform work, that will help me move quickly toward awarding the project.