Enhance Android App – Fix Bugs + Add Features Via Ai

## Android Kotlin Developer Needed – Improve Existing Finance App + Add New Features I have an existing Android application that is already developed and published. The app was largely built using AI-assisted development tools such as **Jules**, so I am completely comfortable with the developer using **Jules, Codex, Claude, ChatGPT or other AI coding tools** to speed up development, as long as the final code is clean, working, secure and maintainable. The project already exists on GitHub. **GitHub Repository:** https://github.com/Rivavainfo/Rivavatrackfi-app **Existing Android App:** https://play.google.com/store/apps/details?id=com.rivavafi.universal The application is built primarily using **Kotlin + Jetpack Compose** and already uses technologies including Firebase, Room, Hilt and Retrofit. ### Work Required I need the existing application reviewed, fixed and improved rather than rebuilt from scratch. #### 1. Login / Signup Email System When a new user successfully signs up, automatically send a professional **Welcome / Thank You email**. If appropriate, also send a login/account confirmation email based on the existing authentication flow. The email system should be implemented securely through a backend/Cloud Function/API rather than exposing email service credentials inside the Android application. #### 2. Forgot / Reset Password Fix and properly implement the **Forgot Password / Reset Password** functionality. The user should: Enter their registered email → receive a password-reset email → securely reset their password → return to the app and login normally. Firebase Authentication is already used in the project. #### 3. Improve Analytics Section The app already contains an Analytics section, but I want it improved significantly. Improve: - Monthly financial overview - Income / credit analytics - Expense / debit analytics - Profit/savings information - Better charts and visualizations - Category breakdowns - Monthly comparisons - Clearer empty states - Better UI/UX - General calculation/data accuracy The section should look professional and remain consistent with the existing app design. #### 4. Add a New "Tools" Section Create a dedicated financial tools/calculator section with a clean UI. It should contain: **Percentage Calculator** Example: 40% of ₹100 = ₹40 --- **Equivalence / Ratio Calculator** Example: 100 = 450 200 = ? Result should automatically calculate the equivalent value. --- **Profit & Loss Calculator** Examples: 40% profit on ₹10,000 = ? 20% loss on ₹10,000 = ? Show original amount, percentage, profit/loss amount and final amount. --- **Compound Interest Calculator** Example: ₹1,000 invested for 10 years at 20% annual interest = ? Show: - Initial amount - Interest rate - Duration - Final amount - Total growth/interest earned --- **MDR Calculator** Calculation requirement: For amounts above ₹2,000: **0.4% of transaction amount** The MDR charge should be capped at a maximum of **₹300**. The developer should properly handle amounts below/above the applicable threshold and clearly display the calculation. --- **EMI Calculator** Inputs should include: - Loan amount - Interest rate - Loan tenure Results should include: - Monthly EMI - Total interest - Total payable amount A simple visual breakdown/chart would be preferred. ### 5. Calculator History All calculators should have a **calculation history** feature. Users should be able to: - See previous calculations - See calculation type - See inputs - See result - See date/time - Reopen/reuse a previous calculation - Delete individual history items - Clear history The existing **Room/local database architecture** can be used where appropriate. ### 6. Improve Premium / Secret Key System The current premium/access system needs to be redesigned. I do **not** want keys generated using an easily predictable pattern. Keys should be: - Randomly generated - Unique - Difficult to guess - Securely stored - Associated with the correct user/account where required - Validated securely - Revocable if required - Protected from simple APK reverse engineering Ideally, key generation and verification should happen through **Firebase/Cloud Functions/backend**, rather than storing the real validation logic or master key directly inside the Android application. ### 7. Payment Gateway Integration If technically and legally feasible, I would also like a payment gateway integrated into the application. The developer should be able to recommend an appropriate gateway and implement: Payment → secure server-side verification → update user's payment/premium status → unlock the relevant application features. Payment status must **never be trusted only from the Android client**. Webhook/server verification should be implemented wherever required. ### 8. Security Cleanup Please review the current project for security problems. This includes: - Removing hardcoded API secrets - Moving sensitive credentials out of the APK - Rotating any credentials that may previously have been exposed - Protecting backend/API calls - Securing premium entitlement checks - Checking Firebase usage - Checking authentication flows - Avoiding sensitive information in logs - General Android security cleanup ### 9. General Bug Fixing Review the existing application and fix general issues you find, including: - Crashes - Navigation problems - Authentication issues - UI bugs - State-management problems - Data persistence problems - Incorrect calculations - Loading-state problems - Layout problems - Keyboard/input issues - Back-button behaviour - Empty/error states The goal is to make the application feel much more stable and production-ready. ### 10. UI / Styling Improvements Please improve inconsistent styling throughout the app while keeping the existing overall Rivava visual identity. Focus on: - Consistent spacing - Typography - Buttons - Cards - Input fields - Dialogs - Navigation - Loading indicators - Animations where appropriate - Dark-theme consistency - Responsive layouts