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Fiverr Pro
English
$
USD
I will integrate firebase, rest API, and payment gateways in flutter
Lysokheng H
About this gig
Already have a beautiful Flutter UI designed, but need a senior engineer to bring it to life with rock-solid backend wiring?
Connecting APIs, handling asynchronous state, token refresh lifecycles, and real-time streams shouldn't cause jank, memory leaks, or unhandled exceptions.
I am Huot Lysokheng, a **Senior Mobile Tech Lead & published open-source author** with 4+ years of hands-on experience building enterprise-grade Flutter applications. Whether you need seamless REST API integration, complete Firebase infrastructure, or secure checkout flows, I write production-ready, testable Dart code that scales.
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### Integrations & Services I Provide:
* **Firebase Ecosystem:**
Authentication: Email/Password, Google Sign-In, Apple ID, Phone OTP, Anonymous.
Cloud Firestore & Realtime Database: Offline persistence, indexing, and real-time snapshot listeners.
Firebase Cloud Messaging (FCM): Foreground, background, and terminated push notification routing.
Firebase Storage, Cloud Functions triggers & Crashlytics telemetry.
* **RESTful & GraphQL API Wiring:**
Complete Postman / Swagger collection implementation with Dio or Http client.
Automated JSON serialization (`freezed` / `json_serializ
Get to know Lysokheng H
Lysokheng H
Senior Mobile Tech Lead and Flutter Developer
- FromCambodia
- Member sinceSep 2026
Languages
Khmer, English
I am a Mobile Team Lead with experience in building and leading mobile apps from the start. My main skills are Flutter and Node.js, and I also have experience in full-stack development, real-time communication, and game development. Currently, I lead mobile development at GateKhmer.ai, focusing on scalable architecture and high-quality product delivery.
My Portfolio
FAQ
How should I provide my API documentation or Postman collection?
You can share a Postman collection JSON, a Swagger/OpenAPI link, or detailed endpoint docs with sample request/response payloads. If your backend is still in development, I can build mock repositories so your app is ready for instant plug-in.
How do you handle API keys and Firebase credentials securely?
Security is paramount. All sensitive keys are loaded via environment variables (.env) and never hardcoded in source control. For Firebase, you can simply add my email as an Editor/Collaborator in your Firebase Console without sharing passwords.
Which Flutter state management architectures do you support?
I follow Clean Architecture and specialize in flutter_bloc (BLoC/Cubit), Riverpod, and Provider. I will seamlessly adhere to your existing codebase structure so all new API integration code feels native, clean, and easily maintainable by your team.
What happens if my backend API has bugs or changes unexpectedly?
I build defensive API layers with custom exception models, HTTP status interceptors, and fallback UI states (loading, empty, error). If your backend team updates schemas during the gig, I provide prompt revisions to align the request/response models.
