Cross-Platform B2B Sales App

I need a complete B2B product-selling solution built simultaneously for Android, iOS, and the web. The core of the project is a catalog-style storefront where business customers can browse detailed product listings, place orders, and pay securely—all from either mobile device or desktop browser.

Key functions
• Product listings – searchable, filterable, with images, specs, tiered pricing, and real-time stock.
• Payment gateway – integrate a widely used provider so buyers can check out in-app or on the website with the same experience.
• Central admin panel – from here I must be able to add or bulk-import products, edit prices, manage user accounts, view orders, and run basic sales reports.

Tech flexibility
I’m open to React Native, Flutter, or another robust cross-platform framework if it speeds delivery, as long as the apps feel native and pass store review. The website can share the same back-end (Node, Laravel, or similar) so maintenance stays simple and APIs are consistent.

Deliverables
1. Android APK + iOS IPA uploaded to Google Play & App Store (approved status).
2. Responsive web front end deployed to my domain.
3. Web-based admin dashboard with role permissions.
4. Source code in a private repo with commit history, plus setup/readme.
5. 30-day bug-fix support after handover.

Acceptance
I’ll consider the job complete when a test buyer can register, browse products, place an order, and pay successfully on each platform, and I can see that transaction in the admin panel.

If something in this outline is unclear, let’s clarify early so the build moves quickly and cleanly.