Engineering responsibility, documented.
Every project is written up the same way: the problem, the engineering challenge, what PEYN delivered, the technology and the outcome.
Placeholder projects · replace with verified case studies
Mobile wallet and merchant payments for [CLIENT NAME]
- Problem
- Customers needed to send money and pay merchants without visiting a branch.
- Challenge
- Secure authentication and safe payment retries on intermittent networks.
- Delivered
- Cross-platform app, payment-flow architecture, release pipeline, monitoring.
- Technology
- FLUTTER · DART · REST API · FIREBASE · CI/CD
- Outcome
- [Verified outcome — confirm with client]
Read case studyLegacy app takeover and Flutter upgrade for [CLIENT]
- Problem
- The original developer left; releases had stopped and crashes were rising.
- Challenge
- Upgrading an undocumented codebase without interrupting live users.
- Delivered
- Audit, stabilisation, dependency upgrades, documentation, Mobile Care.
- Technology
- FLUTTER · DART · CRASH MONITORING · CI/CD
- Outcome
- [Verified outcome — confirm with client]
Read case studyAppointment and patient communication app for [CLIENT]
- Problem
- Patients relied on phone calls to book, change and confirm appointments.
- Challenge
- Handling sensitive data carefully and reminders that must arrive.
- Delivered
- iOS and Android app, notification system, secure messaging.
- Technology
- FLUTTER · FIREBASE · PUSH NOTIFICATIONS
- Outcome
- [Verified outcome — confirm with client]
Read case studyField operations app for [CLIENT]’s distributed teams
- Problem
- Field staff reported work on paper, delaying decisions by days.
- Challenge
- Offline-first capture with reliable sync and conflict handling.
- Delivered
- Offline-capable app, sync layer, admin integration.
- Technology
- FLUTTER · SPRING BOOT · REST API
- Outcome
- [Verified outcome — confirm with client]
Read case studyOn-demand service booking app for [CLIENT]
- Problem
- Bookings were handled manually over messaging apps.
- Challenge
- Real-time availability, scheduling and in-app payments.
- Delivered
- Customer app, provider flows, payments integration, analytics.
- Technology
- FLUTTER · FIREBASE · ANALYTICS · PAYMENTS API
- Outcome
- [Verified outcome — confirm with client]
Read case study