Bilingual Quiz App Development

I'm seeking a skilled developer to build a bilingual (Hindi + English) Quiz App aimed at B.Ed and All India exams.

Key Features:
- User Login: Firebase authentication
- MCQ-based Quiz: with timer
- Result Screen: display correct/wrong answer count
- Admin Panel: add/edit/delete questions
- Firebase Integration: using Realtime Database
- Payment Gateway: Razorpay or Instamojo
- Optional: AdMob integration

UI Design: I have a clear idea of the UI and would like you to create the mockup in Figma.

Ideal Skills & Experience:
- Proficiency in Firebase and mobile app development
- Experience with payment gateway integration
- UI/UX design skills in Figma
- Familiarity with quiz applications

Please provide:
1. Availability for the project
2. Estimated cost and time
3. Examples of similar apps you've built

Thank you,
Ankit Kumar