Kotlin Android App Development

I'm looking for an experienced Android developer who is proficient in Kotlin to build a comprehensive exam preparation app. The app should include the following features:

- Home Screen: User-friendly interface displaying all available options.
- Mock Tests: Subject-wise mock tests with three modes:
- Timed exams
- Practice mode without time limit
- Adaptive difficulty based on performance
- Notes: Exam notes available in PDF or PPT format, organized by subject.
- Recorded Lectures: Subject-wise recorded lectures for user access.
- User Authentication: Email login and Google login.
- Payment Options: In-app purchases for premium content and certificates of completion.

Ideal Skills and Experience:
- Proficiency in Android app development using Kotlin
- Experience with integrating in-app purchases
- Knowledge of implementing Google login and setting up a secure authentication system
- Familiarity with creating a clean, intuitive UI/UX for mobile applications
- Background in developing educational or exam preparation apps is a plus

Please share your portfolio and relevant experience. Looking forward to your bids!