Budget Manager
Secure Offline Finances.
Manage everyday finances with speed, privacy, and confidence. Budget Manager combines local SQLite storage with background Firebase cloud synchronization and custom AES-256 encryption layer.
Dashboard & Wallet Overview
Live Application Screen Showcase
Dashboard & Wallet Overview
Add Expense & Category Selector
Budget & Spending Allocations
Analytics & Reports Trend
Settings & Cloud Backup Profile
Designed around three non-negotiable principles.
Many personal finance applications rely heavily on continuous cloud connections, causing slow load times and zero access during network dead-zones. Budget Manager combines zero-latency local database speed with automatic background cloud backup and client-side encryption.
Always Available
Financial records remain accessible at all times, regardless of cellular coverage or Wi-Fi status.
Instant Execution
Recording an expense or budget update takes milliseconds directly to device SQLite persistence.
AES-256 Protected
Sensitive amounts and notes are encrypted locally before ever reaching cloud servers.
Development Challenges & Solutions
Two-Way Offline & Cloud Sync
Performing operations locally while maintaining a clean, un-duplicated cloud backup without slowing the interface.
Custom two-way sync engine running background parallel Dart isolates.
Sensitive Financial Protection
Cloud databases should never hold plain-text financial amounts or private notes in unreadable form.
Client-side EncryptionService protects values before cloud transmission.
Offline Deletion Conflicts
Preventing expenses deleted offline from accidentally reappearing during the next cloud synchronization pass.
Queued pending-deletion instructions synced safely to Firestore upon reconnect.
Legacy Data Security Migration
Upgrading existing users with plain-text cloud records to encrypted format without losing financial history.
Automated background workflow encrypts legacy records transparently.
Queryable vs Encrypted Fields
Encrypting everything renders database queries impossible. Structural indexes needed to remain queryable.
Structural tags (Month, Year, Profile ID) remain queryable while amounts are encrypted.
Firestore Cost & Batch Limits
Individual document requests increase network traffic, battery drain, and Firestore operations.
Divides updates into chunked batch writes for maximum sync efficiency.
10 Core Product Capabilities
Expense Tracking
Record and organize everyday expenses through an instant, zero-latency local interface.
Budget Management
Structure monthly and yearly budgets across user profiles and customized spending categories.
Financial Categories
Categorize transactions (Groceries, Utilities, Subscriptions, Travel) for clean financial reporting.
Profile-Based Data Model
Multi-profile support organizing distinct financial records under specific user profiles.
100% Offline Availability
Full offline execution for creating, editing, and reviewing financial records without internet.
Automatic Cloud Sync
FirestoreSyncService background engine auto-syncs local SQLite data with Firebase Firestore.
AES-256 Encrypted Records
Sensitive financial amounts and private notes are encrypted locally before cloud transmission.
Efficient Batch Processing
Divides large sync jobs into controlled batches, minimizing network overhead and cloud costs.
Reliable Deletion Queue
Soft-delete pending operations queue ensures offline deletions never reappear after reconnecting.
Reminder Preferences
Lightweight SharedPreferences storage for instant access to bill alerts and app settings.
Technology Stack & Architecture
Mobile Framework
Local Persistence
Cloud Infrastructure
Security Architecture
State Management
System Architecture
Built for Expansion
Let's build an app that stays fast & protects user data.
Code Habit specializes in offline-first mobile applications, client-side encryption, cloud synchronization, and financial software platforms.