Trung HauTrung Hau

Mobile Developer / Flutter Developer

Nguyen Trung Hau

Flutter Developer with 3+ years of experience building cross-platform mobile applications. Experienced across architecture, UI implementation, data flow, authentication, API integration, performance optimization, release workflow, and client handover.

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Currently focused on

Flutter, Clean Architecture, BLoC

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About Me

I am a Flutter Developer focused on building production-ready mobile applications for iOS and Android. I work comfortably with Clean Architecture, Repository Pattern, UseCase, Dependency Injection, BLoC/Cubit, RESTful APIs, Firebase, local databases, and mobile release workflows.

Build Flutter applications from initial architecture through release, handover, and long-term maintenance.
Implement responsive UI, custom widgets, basic animation, Material Design, and Cupertino Design.
Design authentication flows, session handling, token management, refresh token logic, network error handling, and data synchronization.
Experience across e-commerce, aquaculture farm management, document digitization, health dashboards, and private enterprise mobile applications.

Skills

Flutter
Dart
Clean Architecture
Repository Pattern
UseCase
Dependency Injection
BLoC
Cubit
Provider
Responsive UI
Custom Widgets
Material Design
Cupertino Design
GoRouter
AutoRoute
Nested Navigation
Route Guards
RESTful API
Dio
Retrofit
HTTP
Dio Interceptors
Token Injection
Refresh Token
Retry Logic
Request Queue/Replay
OAuth/Cognito WebView
Firebase Authentication
Firebase Analytics
SharedPreferences
Flutter Secure Storage
SQLite
ObjectBox
Isar
FVM
Mason
build_runner
Freezed
JsonSerializable
Injectable
GetIt
FlutterGen
Intl / ARB Localization
Makefile
Flavor Configuration
Figma
Adobe XD
fl_chart
DataTable2
Lottie
Flutter SVG
YouTube Player
Chewie
Camera
Document Scanner
Google Play Deployment
Apple App Store Deployment
Unlisted App Distribution
Build Obfuscation
Git
GitHub
GitLab
GitHub Copilot
ChatGPT
Stack Overflow

Services

Flutter App Development

Build Android and iOS applications from initial architecture, UI, data flow, and business features through production release.

Architecture & State Management

Set up Clean Architecture, Repository, UseCase, Dependency Injection, and BLoC/Cubit/Provider for maintainable, scalable codebases.

API & Authentication

Integrate REST APIs with Dio/Retrofit, token handling, refresh token, retry, request queue/replay, OAuth/Cognito, and Firebase Auth.

Release & Maintenance

Configure flavors, Android/iOS builds, obfuscation, Google Play, App Store, Unlisted App Distribution, and long-term app maintenance.

Experience

Aug 2025 - Present

Mobile Developer / Flutter Developer

Splus Software

Develop cross-platform Flutter applications for Android and iOS using Clean Architecture, BLoC/Cubit, Repository, UseCase, and Dependency Injection; integrate REST APIs with Dio/Retrofit, authentication, sessions, AutoRoute, code generation, flavors, release preparation, and client handover.

Aug 2023 - Apr 2025

Flutter Developer

Tep Bac Technology

Developed Farmext for iOS and Android; owned the Eshop and News/Community modules, directly delivered Warehouse Management, and co-owned Laboratory Management. Built complex Flutter workflows with BLoC/Cubit and Clean Architecture while integrating REST APIs, Firebase, SQLite, media, maps, and location services.

Apr 2023 - Aug 2023

Flutter Developer

HQSoft

Developed features for E-sale Manager, including retail location management, store visit tracking, employee check-in, attendance, sales performance, leave requests, and internal approval workflows.

Nov 2022 - Dec 2022

Flutter Intern

Digitech Solutions

Developed features for Digi-Touch, a business card management application for storing customer and partner information and sharing contact details through QR codes.

Android / iOS / Web

Freelance Flutter Developer

Freelance

Designed and developed applications based on client-specific business requirements; worked on confidential projects across different industries with a focus on practical UI, data handling, and production-ready mobile modules.

Education

Sep 2019 - Sep 2023

Software Engineering

Ho Chi Minh City University of Technology (HUTECH)

Graduated with Honors.

Featured Projects

Farmext

Farmext

An all-in-one aquaculture platform. Owned the end-to-end Eshop journey, News/Community feed, and Warehouse Management; co-developed the Laboratory Management system.

FlutterDartClean ArchitectureBLoCCubitREST APIFirebaseSQLiteGetItGoRouter

Safety Document Management App

Safety Document Management App

Document digitization app with login, task notifications, document scan/capture, upload, backend analysis result review, and confirmation flow.

FlutterClean ArchitectureBLoCDioOAuth/CognitoCamera

Health App

Health App

Health management app for examination history, daily indicators, trend charts, body map visualization, video guidance, and profile management.

FlutterBLoC/CubitRetrofitfl_chartDataTable2ARB
View all projects

Working Strengths

Able to contribute from architecture to release while paying attention to stability, maintainability, and user experience.

Mobile Delivery

Product Mindset

Careful with authentication flows, token handling, retry logic, network failures, and real-world mobile edge cases.

API Integration

Implementation Detail

Contact

If you need a Flutter Developer who can build clear, stable, and release-ready mobile applications, feel free to reach out.

haunguyenaa6@gmail.com
0327333115
Ho Chi Minh City, Vietnam
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