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Expense Tracker App Modernization and Scalability Enhancement for German FinTech Company

instinctools.com

Financial services

Information technology

Business services

Challenges in App Scalability and Performance

The customer's rapidly growing expense tracking app faced technical debt accumulation, memory leaks, and performance bottlenecks during scale-up. The existing codebase required urgent refactoring to maintain stability while accelerating development velocity and reducing long-term maintenance costs.

About the Client

A German financial technology company specializing in personal expense management solutions for mobile users

Modernization Goals

Implement comprehensive code refactoring to improve maintainability
Optimize application performance for large datasets
Enhance system stability through memory leak elimination
Reduce ongoing maintenance costs by 11%
Establish scalable architecture for future feature expansion

Core System Functionalities

Real-time budget visualization dashboard
Streamlined expense entry workflow
Advanced statistical analysis with data visualization
Multi-category expense classification
Cloud synchronization for cross-device access

Technology Stack

Xamarin.iOS

SQLite

Core Animation

Core Graphics

System Integrations

Cloud storage APIs (iCloud/AWS S3)
Payment gateway integration
Cross-platform authentication

Non-Functional Requirements

Sub-100ms UI response time for core operations
Support for 10,000+ concurrent users
AES-256 data encryption for financial records
99.9% application uptime SLA
Cross-platform compatibility with iOS 14+

Expected Business Impact

Projected 11% reduction in maintenance costs through technical debt reduction, 40% improvement in application responsiveness, and 25% faster feature deployment cycles. Enhanced stability expected to increase user retention by 15% while supporting 3x user growth over 18 months.