Finalization of "ChaloTrain" Android Railway App

I already have a working Android project ZIP for my railway information app "ChaloTrain".

The major UI and app structure are already developed. I need an experienced Android + Backend developer to complete the remaining work and take the existing project to Google Play Store publication.

IMPORTANT:
Do NOT build the app from scratch.
Use my existing project ZIP as the base project.

CURRENTLY COMPLETED:
- Premium Android UI
- Home screen
- Splash screen
- Search Train
- Search Train autocomplete
- Recent Searches
- Live Train Status UI/navigation
- PNR UI
- Bottom navigation
- Settings
- Language support
- Dark mode
- About / Privacy / Terms

REMAINING WORK:
- Complete railway API integration
- Backend/API proxy
- PNR API
- Live Train Status API
- Train Schedule API
- Trains Between Stations API
- Seat Availability API
- Fare Enquiry API
- Live Station API
- Train Classes API
- API caching/rate-limit handling where required
- Secure API keys
- Loading/error/empty states
- Small UI/UX fixes
- Remove remaining mock/demo data
- Complete testing
- Production release build
- Google Play Console submission
- Play Store publishing assistance

QUALITY REQUIREMENTS:
- No fake railway data in production
- No hardcoded API keys in Android client
- Preserve existing working UI and navigation
- Do not unnecessarily redesign existing screens
- Fix compilation errors and release-blocking bugs
- Test real API responses
- Test API errors, timeout, no internet and rate limits
- Test the app on a real Android device
- Provide a working demo APK before final release

DELIVERABLES:
1. Updated Android source code
2. Backend/source code
3. Working demo APK
4. Production signed AAB
5. API/backend configuration documentation
6. Play Store submission assistance
7. Final published app on Google Play Store, subject to Google's review process

BUDGET:
₹10,000 FIXED TOTAL.

MILESTONES:
₹2,000 — Existing project setup + working demo
₹3,000 — API/backend integration
₹2,000 — Testing + bug fixing
₹3,000 — Production AAB + Play Store submission/publishing

IMPORTANT:
Before accepting the project, download/review the existing ZIP and confirm that you can complete the agreed scope within ₹10,000.

Do not ask for additional payment for the agreed scope after starting the project.

If any task is outside the agreed scope, discuss it with me and get approval before doing it.

Please mention in your proposal:
- Android/Kotlin experience
- Jetpack Compose experience
- Backend/API experience
- RapidAPI experience
- Google Play Console experience
- Estimated completion time
- Confirmation that ₹10,000 fixed budget is acceptable