Expense Manager: Offline-First Encrypted Personal Finance & Cash Flow Engine
Created a privacy-first personal finance tracker operating 100% offline with hardware-encrypted SQL database storage, monthly budget caps, and dynamic analytical charts.
The Engineering Challenge
Users demanded zero cloud data transmission for sensitive financial records while maintaining fast analytical queries across tens of thousands of historical transactions.
What I Built & Delivered
Built an offline-first architecture utilizing SQLCipher with AES-256 database encryption.
Engineered an interactive charting engine with FL Chart that computes complex categorization breakdowns and monthly spending forecasts instantly.
Created automated background PDF statement and CSV ledger export tools generated on-device without external servers.
Implemented biometric authentication (Fingerprint / Face Unlock) to guard application access.
Architectural Highlights
Encrypted SQLite Repository Pattern
Indexed SQLCipher database executing sub-5ms queries across 50,000+ transaction records.
On-Device Document Generation Engine
Native Dart PDF canvas rendering generating customized financial reports in seconds.
Engineering & Business Results
Zero network latency and 100% data privacy with zero cloud dependencies.
Over 10,000 active Android installs with a 4.8-star review rating.
Instant chart rendering and real-time category spending breakdowns.
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