Android Productivity App with Gamified Store

I'm looking for a skilled Android developer to create a unique productivity app. The app will feature an online store that's gamified, making shopping an engaging experience. This store will sell a variety of products.
I dont have anything that I could remember exactly like this, I am attaching a pdf file or bulet file explaininy everything about the app.
Please only serious developers msg me with full plan.
I need it fast and cheap.
Key Features:
- The app should prioritize productivity, incorporating task management, calendar integration, and note-taking features.
- The online store should be designed with gamification at its core, making the shopping experience interactive and fun.
- The store will sell a range of products, so the app should accommodate diverse inventory.

Ideal Skills:
- Proficient in Android app development.
- Previous experience with e-commerce and gamification is highly desirable.
- Strong understanding of productivity app features and design.