Change Theme of Existing Flutter App (Zepto-Style UI) – Grocery App Clone

I already have a full working Flutter grocery delivery app code.
I just need a UI/Theme redesign to make it look modern, clean and similar in feel to Zepto’s app UI.

Nothing from scratch — only UI changes.

What I Need

Change colors, typography, buttons, icons, spacing to match a Zepto-style theme
(Dark purple, neon accents, clean minimal layout)

Update home screen, product list, cart screen, onboarding, login, categories, and checkout UI

Make the theme professional, modern, fast, visually sharp

Keep all existing backend, APIs, logic, routing as it is

Only Flutter front-end UI changes

Ensure the design is responsive for Android & iOS

Provide updated Figma / XD file (optional) if you can

Must follow good Flutter UI structure (no dirty hacks)

Deliverables

Complete updated Flutter project with the new theme

Clean, readable code (no breaking of existing functionality)

Optional: App preview via APK or TestFlight

1–2 revisions if needed

Skills Required

Flutter UI/UX expertise

Strong knowledge of theme customization

Experience with modern mobile UI

Experience with grocery/e-commerce apps (bonus)

My Code Details

Flutter app (working)

All logic, API, backend already done

Only need frontend theme changes

Budget

Please quote your best budget.
Fast turnaround preferred.