Android (Java/Kotlin) App Customization

I am looking for an Android app developer who can customize my app by integrating it with third-party APIs. I have a specific list of functionalities that I want to modify. The customization needs to be completed within 1 week.

Skills and experience required:
- Strong knowledge of Android development using Java or Kotlin
- Experience with integrating third-party APIs - Crypto Payment Gateways like Coinbase Commerce or NowPayments or BitGo or Block.io that can receive payments and perform call backs on the app automatically.
- UI/UX design skills for making necessary changes to the app's appearance and user experience.

Features to Integrate:
Reskin the App
Add an Electronic Mining Feature
Add crypto payment gateway
Adjust Referral Earnings
Add More Games

Project is divided in 3 phases, we can only do phase 1 now and Phase 2-3 After launch as CI/CD.
Ensure you have the requisite experience.
**PLEASE WE HAVE A TIGHT & LIMITED BUDGET ($250) AND JUST 5 TASKS, CHECK THE BUDGET BEFORE APPLYING. THANKS.