Zubair Umer | Flutter Developer | Android, iOS & Web Apps

Services

What I Offer

Comprehensive development services to bring your ideas to life

Mobile App Development

Cross-platform Flutter apps for iOS & Android with native performance.

iOS & Android Apps
App Store Publishing
100K+ Downloads

From $500

Desktop Applications

Native apps for Windows, macOS & Linux with Flutter.

Windows Apps
macOS Apps
Linux Apps

From $800

Payment Integration

Expert implementation of payment gateways & subscriptions.

Stripe & Wise
Easypaisa & JazzCash
In-App Purchases

From $300

Node.js Backend

Scalable REST APIs & real-time WebSocket connections.

REST APIs
GraphQL
WebSockets

From $400

Firebase & Supabase

Complete BaaS with real-time databases & auth.

Auth & Firestore
Cloud Functions
Real-time Sync

From $250

Maps & Location

Google Maps with tracking & geofencing.

Live GPS Tracking
Geofencing
Route Optimization

From $200

UI/UX Design

Modern UI with smooth animations.

Modern UI
Animations
Responsive

From $150

Localization (i18n)

Full internationalization with RTL support.

15+ Languages
RTL Support
Currency Format

From $100

Available for new projects

Need a Custom Solution?

Let's discuss your project requirements!

Hire on Fiverr

Portfolio

Published Apps

10 live applications with 100K+ downloads

LIVE iOS

Airport OGRE

Risk assessment app for airport operations with PDF reporting.

Flutter Firebase

App Store

100K+ Android

DvGo Driver & User

Ride-sharing with real-time tracking & payment integration.

Flutter Maps

Driver User

LIVE iOS

Hypesphere

Entertainment & media platform with advanced UI/UX.

Flutter Media

App Store

LIVE Android

Hikmat Educational

Multi-language education with subscriptions & in-app purchases.

Education IAP

Play Store

LIVE iOS

Safetrion

Security & safety management with real-time monitoring.

Security Flutter

App Store

LIVE iOS

United AI Academy

AI-powered educational platform with personalized learning.

AI Education

App Store

LIVE iOS

Linkquester Global Link

Professional networking & link management.

Networking Supabase

App Store

LIVE Android

Pap App

Educational management with dashboards & task tracking.

Supabase GetX

Play Store

LIVE Android

Tamayuz

Dynamic lifestyle app with premium UI/UX.

Lifestyle Firebase

Play Store

+20 More Projects

Desktop Apps AI Assistants Shaadi Done Gadget Shop Attendance Food Delivery Bike App Movie Booking

Skills

Tech Stack

Flutter

Dart

Node.js

Firebase

Supabase

PostgreSQL

VS Code

Git

GitHub

Android

iOS

Figma

GCloud

Linux

Windows

Stripe

Journey

Experience

Jan 2025 – Present

Senior Flutter Developer

MTAI Software Lab • Remote

Integrated Stripe, Wise, GoCardless, Easypaisa & JazzCash
Implemented in-app purchases boosting revenue by 40%
Added localization for 15+ languages
Built REST APIs using FastAPI reducing response time by 60%

Oct 2023 – Dec 2024

Flutter Developer

Plan D Studios • Rawalpindi

Built Flutter apps with 100K+ downloads
Implemented GetX improving performance by 35%
Integrated REST APIs and optimized UI/UX

2020 – 2024

BS Computer Science

PMAS Arid Agriculture University

CGPA: 3.2/4.0

Deep Dive

Tech Expertise

APIs, CI/CD Pipelines & Code Architecture — three pillars that together build a world-class product

APIs I Work With

These are the APIs I regularly integrate across my projects — Payments, Auth, Backend & more

Payment Gateway APIs

Secure & fast APIs for handling real-world financial transactions

Stripe — Cards & Subscriptions

Wise — International Transfer

GoCardless — Direct Debit

Easypaisa — Pakistan Mobile

JazzCash — Pakistan Wallet

Firebase APIs

Google's real-time database, authentication & cloud services

Firestore — NoSQL Database

Auth — Phone / Google / Email

FCM — Push Notifications

Storage — File Upload / Images

Remote Config — Dynamic Values

Supabase APIs

Open-source Firebase alternative — PostgreSQL based

REST API — CRUD Operations

Realtime — WebSocket Channels

Auth — JWT + RLS Security

Storage — Bucket Management

Edge Functions — Serverless

Custom Backend APIs

Self-built REST APIs using Node.js & FastAPI

REST API — Express.js

FastAPI — Python & Uvicorn

WebSocket — Real-time Chat

JWT Auth — Secure Tokens

Rate Limiting — API Security

In-App Purchase APIs

App Store & Play Store subscriptions — Revenue boost

Apple StoreKit 2 — iOS

Google Billing — Android

RevenueCat — Cross-platform

Subscription Management

Receipt Validation

Third-Party APIs

Integrating external services seamlessly into applications

Google Maps — Location & Routes

OpenAI — AI Chat & Vision

SendGrid — Email Service

Twilio — SMS & OTP

Agora — Video Calling

What is a CI/CD Pipeline?

From writing code to deploying the app — an automated process that runs tests and deployment on every commit

GitHub Actions Workflow — My Real Pipeline

Code Push

git push

→

Tests Run

flutter test

→

Build APK

flutter build

→

Code Sign

Keystore

→

Deploy

Play Store

.github/workflows/deploy.yml

name: Flutter CI/CD Pipeline

on:
  push:
    branches: [ main, develop ]
  pull_request:
    branches: [ main ]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      # Step 1: Code checkout
      - uses: actions/checkout@v3
      
      # Step 2: Flutter setup
      - uses: subosito/flutter-action@v2
        with:
          flutter-version: '3.x'
      
      # Step 3: Dependencies install
      - run: flutter pub get
      
      # Step 4: Run tests
      - run: flutter test --coverage
      
      # Step 5: Build APK (Release)
      - run: flutter build apk --release
      
      # Step 6: Upload to Play Store
      - uses: r0adkll/upload-google-play@v1
        with:
          serviceAccountJsonPlainText: ${{ secrets.SERVICE_ACCOUNT }}
          packageName: com.myapp.package
          track: production

Saves Time

No more manual deployments — just push your code and everything runs automatically

Catch Bugs Early

Tests run on every commit — bugs are caught before they ever reach production

Team Collaboration

Multiple developers can work simultaneously — conflicts are resolved and merges are seamless

Code Architecture

I follow Clean Architecture — all layers are separated, testing is straightforward and code remains scalable

Flutter Clean Architecture

Presentation Layer (UI) Screens + Widgets

Pages / Screens Widgets BLoC / GetX / Provider State Management

↓ depends on ↓

Domain Layer (Business Logic) Pure Dart

Entities Use Cases Repository Interfaces Business Rules

↓ depends on ↓

Data Layer APIs + DB

Repository Impl Data Sources (Remote/Local) Models (JSON Parsing) Cache (SharedPrefs / Hive)

MVVM Pattern

Model-View-ViewModel — separates UI from business logic. State is managed via GetX or Provider

Feature-Based Folder Structure

Each feature lives in its own folder: features/auth/, features/payment/ — easy to navigate

Dependency Injection

I use GetIt or Injectable for dependency injection — ensuring loose coupling and easy unit testing

Error Handling & Logging

Either type pattern with Crashlytics for error tracking — no issue goes unnoticed in production

lib/ folder structure

lib/
├── core/
│   ├── constants/     # Colors, strings
│   ├── error/         # Failures, exceptions
│   ├── network/       # Dio, interceptors
│   └── utils/         # Helpers, validators
├── features/
│   ├── auth/
│   │   ├── data/      # API calls, models
│   │   ├── domain/    # Use cases, entities
│   │   └── presentation/ # Screens, controller
│   ├── payment/
│   └── home/
└── main.dart

I'm Zubair Umer

Who I Am

Professional Summary

What I Offer

Mobile App Development

Desktop Applications

Payment Integration

Node.js Backend

Firebase & Supabase

Maps & Location

UI/UX Design

Localization (i18n)

Need a Custom Solution?

Published Apps

Airport OGRE

DvGo Driver & User

Hypesphere

Hikmat Educational

Safetrion

United AI Academy

Linkquester Global Link

Pap App

Tamayuz

+20 More Projects

Tech Stack

Experience

Senior Flutter Developer

Flutter Developer

BS Computer Science

Tech Expertise

APIs I Work With

Payment Gateway APIs

Firebase APIs

Supabase APIs

Custom Backend APIs

In-App Purchase APIs

Third-Party APIs

What is a CI/CD Pipeline?

GitHub Actions Workflow — My Real Pipeline

Saves Time

Catch Bugs Early

Team Collaboration

Code Architecture

Flutter Clean Architecture

MVVM Pattern

Feature-Based Folder Structure

Dependency Injection

Error Handling & Logging

Let's Work Together

Send a Message

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