European FinTech Banking App at Codego

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

Flutter Developer at Codego, Mar 2024 – Jun 2026.

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.

Specific user numbers and internal metrics are confidential.

• 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.

• Understand the product flows and API contracts before implementation.
• Map all transfer states and edge cases.
• Plan small, testable releases.
• Build the Flutter UI and state management layer.
• Verify behavior on Android and iOS devices.
• Release through store channels and monitor crashes.

• 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.

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