Built and optimized a robust call recording and log upload solution tailored for Android 10+, handling OEM-specific behaviors and system limitations.

🔍 Research & Architecture

• Explored Android limitations post Android 10:
  • MediaProjection & AccessibilityService constraints.
  • Internal audio capture restrictions.
  • Native call log inconsistencies across OEMs.
• Designed a hybrid recording approach:
  • MediaProjection-based internal recording with AccessibilityService fallback.
  • Support for VoIP & GSM calls, with MIC fallback where internal audio capture fails.

Feature Implementation

• Integrated secure login API with structured error handling.
• Designed Login/Home UI with Jetpack Compose.
• Created upload APIs (recordings + text) with Retrofit and error handling.
• Implemented structured Compose based permission flow (Call Log, Storage, Audio).
• Developed call detection using PhoneStateListener and BroadcastReceiver.
• On call end:
  • Fetched native recording.
  • Encrypted it using AES-256.
  • Uploaded securely using Foreground Service.
• Finalized and tested reliable upload logic under Doze/background restrictions.

Key Contributions & Fixes

Recording & Log Matching

• Switched to call end time (vs. start time) for accurate long-call matching.
• Normalized phone numbers to avoid mismatches.

Smart Retry Logic

• Skipped uploads for already-uploaded files.
• Reduced network/battery overhead.

Missed/Declined Call Handling

• Prevented broken/empty recordingURL uploads for missed/declined calls.

Sticky Logout Notification

• Non-dismissible logout notification:
  • Reopens app on tap.
  • Auto-clears post-login.

Tech Stack

• Language: Kotlin
• Architecture: MVVM
• UI: Jetpack Compose, ViewBinding
• Networking: Retrofit
• Background Tasks: Foreground Service, WorkManager
• Storage: Room, SharedPreferences
• Permissions: Custom Compose-based permission manager
• Encryption: AES-256
• Call Handling: PhoneStateListener, BroadcastReceiver
• Recording: MediaRecorder, MediaProjection
• Cloud Storage: Amazon S3
• Notifications: Sticky logout alerts
• Testing: Manual logs, system broadcast tracing
• Utilities: Number normalization, timestamp matching

Project 2: Revfin & RevnU App

Revfin Admin App:

• Contributed to an app that offers loans to independent EV drivers for last-mile connectivity, in collaboration with EV manufacturers and dealerships across India.
• Worked on the existing application, gained a deep understanding of the codebase and flow, and implemented multiple features. These included fetching the user’s location, saving it to a local database, and sending all saved data to the server in batches.
• Resolved various bugs and contributed to improving overall app stability and performance.

App Link:- https://play.google.com/store/apps/details?id=com.revfin_ptech18&hl=en_IN

RevnU Admin App:

• Worked on the admin application used by internal teams to manage loan applications, disbursements, customer loan details, and field inspections, etc.
• Implemented new features, resolved issues and worked on the modules, and performed codebase optimizations to enhance performance and maintainability.

App Link -: https://play.google.com/store/apps/details?id=com.revfin.partner&hl=en_IN

Tech Stack: Both apps were developed using Kotlin and followed modern Android architecture principles (MVVM). Utilized Koin for dependency injection, Coroutines for asynchronous operations, Navigation Component, View Binding, Flow, Room for local database handling, and SharedPreferences for persistent data storage.

Building an app for 500+ bus operators with diverse needs and an integrated booking system requires flexibility, scalability, and ease of use. Here’s a simplified overview:

Key Features:

1. Custom Branding: Each bus operator can customize their own interface, logos, and color schemes to reflect their branding.
2. Booking System: A centralized booking engine with real-time seat availability, dynamic pricing, and multi-operator routes.
3. Route & Schedule Management: Real-time updates, GPS tracking, and route optimization for better efficiency.
4. Service Types: The app should support various service types—such as luxury buses, sleeper coaches, and budget buses—offering operators flexibility in defining their offerings.
5. Multi-Payment Gateway Integration: Integrate multiple payment gateways, allowing passengers to choose from various payment methods (credit cards, e-wallets, bank transfers).

• Developed Bus Operator App from Scratch. In this app we used – Kotlin, MVVM, Koin, Coroutines , Firebase, Navigation Component, ViewBinding, MVVM.

App : https://play.google.com/store/apps/details?id=com.bitla.busmobility