Seyyah Mobile — eSIM for Tourists
An eSIM purchasing and management application for international travelers offering affordable data roaming without physical SIM cards.
Project Overview
Seyyah Mobile helps travelers purchase, manage, and top up eSIM connectivity for international trips without relying on traditional expensive roaming.
Users select global destinations, choose data packages, complete secure checkouts, and install digital eSIM profiles directly from their smartphones.
My Engineering Role
Flutter development for the cross-platform eSIM customer experience, telecom service integrations, and secure payment checkout.
The Challenge
Connectivity products must explain unfamiliar activation states while coordinating purchases, plans, top-ups, and telecom provider account data.
The Solution
The mobile flow presents plan selection and eSIM management as clear stages, with carrier integration details isolated behind reliable service adapters.
High-Level Architecture
- Flutter presentation layer isolating carrier API activation states behind domain facades.
- Secure checkout gateway handling multi-currency Stripe and Apple Pay transactions.
- Telemetry repository polling data balance and usage metrics with exponential backoff.
Key Features & Workflows
- Destination search and regional data plan selection
- Instant eSIM profile purchase and QR code installation
- Account and active eSIM data balance tracking
- One-tap top-up workflow during international transit
- Comprehensive travel connectivity FAQ and troubleshooting
Technical Challenges Overcome
- Translating complex carrier provisioning error codes into clear, user-friendly instructions
- Handling asynchronous payment webhooks and instant eSIM profile delivery
- Ensuring seamless in-app installation flow across varying iOS and Android eSIM SDK capabilities
Production Results & Impact
- The application has an active Apple App Store listing and public product website.
- The portfolio records reliable service coverage across 165+ countries.
- Significant reduction in customer support requests due to intuitive in-app onboarding.
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