International travelers face multiple challenges:

Exorbitant roaming charges

The inconvenience of sourcing and installing physical SIM cards in foreign countries

Managing multiple mobile plans across regions

They needed a simple, affordable, and instant solution to stay connected anywhere in the world without the hassle of traditional methods.

As the Lead Full-Stack FlutterFlow Developer, I:

Designed and developed the UI/UX in FlutterFlow

Architected the backend integration and serverless architecture

Engineered the communication layer between the app, Firebase backend, and the third-party eSIM provider's REST API

Implemented a secure Stripe payment gateway for global transactions

The main objective was to create a reliable, secure, and intuitive mobile app for instant eSIM connectivity. Key goals included:

Seamless user flow for selecting, purchasing, and installing an eSIM in minutes

Secure integration with the third-party eSIM provider API to fetch plans, process orders, and deliver eSIM profiles in real-time

Implementation of a globally-accepted Stripe payment system

Use of serverless architecture with Cloud Functions for scalable, secure backend logic

The Tejwal.ai app delivers significant value to global travelers:

Provides immediate, hassle-free connectivity in over 200 locations, eliminating roaming fees and SIM card hassles

Offers a fully automated and trustworthy user experience from payment to activation

Serverless architecture ensures scalability, low operational costs, and high reliability

Simplifies eSIM technology for non-technical users, making global connectivity accessible via smartphone

The platform was built with a modern serverless stack for performance, scalability, and security.

Built a polished, responsive cross-platform app (iOS & Android) from a single codebase

Designed an intuitive UI for browsing hundreds of data plans

Implemented multi-language support (English and Arabic)

Keywords: FlutterFlow, Cross-Platform, Mobile App Development, UI/UX, Localization

Engineered all backend logic using Firebase Cloud Functions (Node.js/TypeScript)

Developed secure middleware for integration with the third-party eSIM provider API

Handled fetching data plans, order processing, and eSIM QR code delivery

Keywords: Firebase Cloud Functions, REST API Integration, Serverless, Node.js, Middleware, eSIM

Integrated Stripe for secure, international transactions

Created Cloud Functions to handle payment intents, process charges, and confirm orders via webhooks

Keywords: Stripe API, Payment Gateway, FinTech, Secure Payments, Webhooks

Used Firestore for storing user data, purchase history, and active eSIM states

Leveraged Firebase Authentication for secure, easy sign-up and login

Keywords: Firebase, Firestore, Real-time Database, User Authentication