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Enhancement of Self-Custody Digital Wallet with Advanced Security and Global Scalability

altoroslabs.com

Financial services

Information technology

Security

Challenges in Functionality, Security, and Scalability

The Android wallet app had limited functionality (account creation and bank connection only), lacked recovery mechanisms (users lost access after reinstallation), faced security risks for $240M+ in assets, and experienced performance bottlenecks under heavy loads. The platform required global scalability and improved maintainability.

About the Client

A fintech company offering a self-custody digital wallet for managing stablecoins, cryptocurrencies, and earning interest, with $180 million borrowed through its platform and over $1 million raised in funding.

Key Goals for System Enhancement

Enable two-way integration for transfer/withdraw operations via mobile app
Implement robust security measures to protect sensitive data and prevent fraud
Develop a recovery mechanism to prevent fund loss during app reinstallation
Optimize performance and workflows for global scalability
Enhance code maintainability and reduce technical debt

Core Functionalities and Features

Two-way mobile app integration for asset transfers and withdrawals
QR code generation for transactional addresses using ZXing
Biometric authentication (face/fingerprint) and encrypted private key storage
Gnosis-based wallet recovery mechanism
Interest calculation algorithm optimization

Technology Stack and Tools

Web3j

ZXing

Gnosis Safe Contracts

SQLite

Dagger

Android SDK

Critical System Integrations

Mobile app ↔ Digital wallet two-way communication
QR code transaction interface
Android native authentication APIs

Performance and Security Requirements

High security for $240M+ in assets (data encryption, transaction verification)
Fault tolerance and 2x latency reduction under heavy loads
Scalable architecture for global market expansion
Code maintainability through modular design patterns

Expected Business Outcomes

Enablement of $240M+ in asset transfers, protection of 50,000+ users from data exposure, 2x performance improvement under load, seamless global scalability, and reduced operational risks through enhanced recovery and security mechanisms.