PROJECT
Simply Zibra Payments
Simply Zibra · Software Engineer · March 2022 — October 2022
Overview
Simply Zibra was a cross-platform mobile payment application targeting consumer peer-to-peer payments, account top-ups, and transaction history. I joined as the lead engineer on the mobile + backend stack and shipped both iOS and Android from a single Flutter codebase.
The backend ran on Firebase + GCP — Firestore for the transaction ledger, Cloud Functions for payment orchestration, and Pub/Sub for fan-out of webhook events from third-party banking partners. My biggest impact was on reliability: I introduced an observability layer (structured logging + alerting on circuit-breaker trips) that cut production downtime by 15% over the months I was there.
Key Contributions
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Architected the Firebase + GCP backend — Firestore schema for the transaction ledger, Cloud Functions for orchestration, Pub/Sub for partner-webhook fan-out.
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Shipped iOS + Android from a single Flutter codebase, including platform-specific biometric auth and push notification handling.
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Introduced circuit-breaker patterns and structured observability around third-party banking integrations, reducing production downtime by 15%.
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Built the real-time transaction stream that powered the in-app feed and balance updates without polling.
Tech Stack
Flutter
Dart
Firebase
Firestore
Cloud Functions
Pub/Sub
GCP
iOS
Android