Hybrid Service App Development

I already run the site https://raadhdipdigitalpan.in and now need a hybrid mobile app that mirrors its service-oriented workflow. The core goal is to let users access every service currently available on the site from a smooth, install-and-go experience on both Android and iOS.

The build must be truly hybrid—Flutter, React Native, Ionic or any comparable cross-platform stack works as long as the final result feels native and has quick load times. All screens, forms and payment or login flows that exist on the website should be reproduced one-to-one inside the app, with consistent branding and colour scheme.

Key expectations
• Single code-base targeting Android and iOS
• Clean navigation that matches the website’s structure
• Secure connectivity to the existing backend/APIs (no data silos)
• Release-ready builds (APK + IPA/TestFlight) plus full source code

Acceptance will be based on:
1. Every live service on the website functioning in the app without errors.
2. Account details and transactions syncing instantly with the web portal.
3. Smooth performance on common mid-range phones.

Let me know which hybrid framework you prefer, any prior similar apps in your portfolio, and a realistic timeline to hit the app stores.