Add features in Android & iOS app,

1. Bet win calculation
2. Leaderboard
3. Invitation code
4. Missions & achievements
5. Add notifications
6. Contest timer
7. Stats table
8. Show ad counter in missions & achievements
9. Csv download for bet history and delete button to delete old data
10. Add static pages such as instructions, faqs and rules
11. Activate admob for android

You must know mongodb and nodejs because this is connected to admin panel.
Some of the code for these features is done and UI is completely done.
Please check the APK attached below to get an idea.