Context

CodegoPay Individual is a personal banking app for European users. It supports IBAN onboarding, SEPA and SEPA Instant transfers, direct debit, biometric payment authorization, and always-on account access.

The problem: The product needed a reliable mobile interface for sensitive financial flows, with strong authentication, clear transaction states, and consistent behavior across Android and iOS.

Team & Ownership

Worked within a product team alongside backend engineers, QA, and product managers.

I contributed to the Flutter mobile implementation, API integration, and release preparation. Some architectural and backend decisions were owned by other team members.

Challenges

• —Complex API states for pending, failed, and completed transfers.
• —Secure session expiry and re-authentication flows.
• —Platform differences in biometric APIs and background behavior.
• —Maintaining stability across multiple production releases.

Key Contributions

• —Implemented transfer-state handling and transaction-history screens.
• —Built biometric authorization entry points.
• —Integrated Firebase Cloud Messaging for account notifications.
• —Resolved production issues reported through Crashlytics.
• —Prepared and shipped multiple store releases.

Key decisions

Results

• —Shipped to Play Store and App Store.
• —Integrated production transfer and KYC flows.
• —Supported ongoing production releases and crash monitoring.

Lessons Learned

• —Financial apps require rigorous state modeling and clear error messaging.
• —Platform biometric APIs differ enough to justify abstraction and separate testing.

Gallery

Personal banking dashboard