You will get a Flutter app bug fix, code review & performance optimization
Project details
Is your Flutter app crashing, running slow, or built on messy code that's hard to maintain? I can fix it.
I am a Senior Flutter Engineer with 4 years of experience building and shipping production Flutter applications. I have reviewed, debugged, and optimized multiple codebases across ride-sharing, IoT, eCommerce, and health app domains.
What I deliver:
Bug identification and fixing — crashes, UI glitches, API failures
Performance optimization — smooth 60 FPS rendering, reduced rebuild cycles
Code review with actionable improvement recommendations
State management refactoring — Riverpod, BLoC, Provider, GetX
Clean Architecture and MVVM implementation
Memory leak detection and resolution
Firebase optimization — reducing unnecessary reads and cloud costs
App size reduction and build optimization
I don't just fix the symptom — I find the root cause and fix it properly so it doesn't come back.
📩 Message me before placing your order — share your issue and I will give you an honest assessment.
I am a Senior Flutter Engineer with 4 years of experience building and shipping production Flutter applications. I have reviewed, debugged, and optimized multiple codebases across ride-sharing, IoT, eCommerce, and health app domains.
What I deliver:
Bug identification and fixing — crashes, UI glitches, API failures
Performance optimization — smooth 60 FPS rendering, reduced rebuild cycles
Code review with actionable improvement recommendations
State management refactoring — Riverpod, BLoC, Provider, GetX
Clean Architecture and MVVM implementation
Memory leak detection and resolution
Firebase optimization — reducing unnecessary reads and cloud costs
App size reduction and build optimization
I don't just fix the symptom — I find the root cause and fix it properly so it doesn't come back.
📩 Message me before placing your order — share your issue and I will give you an honest assessment.
Platform
AndroidApp Type
Hybrid AppDevelopment Technology
Flutter, React Native, SwiftApp Purpose
Chat, Delivery, Entertainment, Education, Health & Fitness, IoT, Lifestyle, Maps & Navigation, Medical, TravelExpertise
Design, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$299
|
Standard
$1,499
|
Advanced
$2,399
|
|---|---|---|---|
| Delivery Time | 5 days | 15 days | 35 days |
Number of Revisions | Unlimited | Unlimited | Unlimited |
Bug Investigation | |||
Fix Documentation | - |
Frequently asked questions
16 reviews
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HM
Hope M.
Mar 4, 2026
Skilled Flutter & Android & Ios Developer for Mobile App Development
Mounim did an excellent job on our Flutter mobile app development task. He built 3–4 clean, responsive screens for both Android and iOS and handled the API integration smoothly with proper JSON parsing and state management.
As a professional Flutter developer, he delivered well-structured, maintainable code and ensured the app was user-friendly and performance-optimized. Communication was clear, deadlines were met, and the final result matched our expectations perfectly. Highly recommended for any Flutter app project.
As a professional Flutter developer, he delivered well-structured, maintainable code and ensured the app was user-friendly and performance-optimized. Communication was clear, deadlines were met, and the final result matched our expectations perfectly. Highly recommended for any Flutter app project.
MK
Muhammad Arif K.
Feb 28, 2026
Senior Flutter Developer – Convert Production Web App (Firebase Backend) to Flutter (Frontend-Only)
Mounim did an excellent job as our Flutter developer, converting our web app into a clean, frontend-only Flutter app while keeping our live Firebase backend unchanged.
He smoothly integrated Firebase Auth, Firestore, and Cloud Functions, followed our fixed schema, and used Clean Architecture with Riverpod. Delivery was milestone-based, well-structured, and production-ready for both iOS and Android.
Highly recommended for any serious Flutter mobile app development project.
He smoothly integrated Firebase Auth, Firestore, and Cloud Functions, followed our fixed schema, and used Clean Architecture with Riverpod. Delivery was milestone-based, well-structured, and production-ready for both iOS and Android.
Highly recommended for any serious Flutter mobile app development project.
PG
Pralabh G.
Mar 21, 2022
Need a wordpress developer
SA
Samir A.
Oct 15, 2021
Website design
YF
Yupi F.
Aug 9, 2021
Web design on current woocommerce theme
I asked to do a rework on home page with content included, specified the job and everything. He simply used a template for elementor and changed few bits around. that's it and ask me how much i was willing to pay for extra content. Poor understanding of what was asked. And poor web development skills. all he does is uses templates and edits them. Anyone can do that. I'm afraid i will not recommend this individual for anyone. Complete waste of time. He did ask for what i wanted done, but it became too much for me so i had to cancel the contract. Also he never asked permissions to install extra plugins on my store.
About Mounim
Senior Flutter Developer | iOS & Android | IoT & BLE
100%
Job Success
Bahawalpur, Pakistan - 1:19 pm local time
I am a Senior Mobile Engineer with 4 years of professional experience building and shipping production-grade iOS and Android applications. I specialize in Flutter-based mobile development with a strong technical niche in IoT integration, real-time hardware communication, and high-autonomy product ownership.
Over my career, I have engineered and shipped production systems across the UK, Turkey, UAE, and Gulf markets — covering domains like ride-sharing, smart car rentals, IoT vehicle control, and logistics. I handle everything independently from initial architecture design to final App Store and Google Play deployment.
🚗 What I Build & Specialize In:
✅ IoT & Connected Hardware Apps: Deep hands-on experience implementing BLE (Bluetooth Low Energy), Classic Bluetooth, MQTT protocols, WebSockets, and Arduino hardware interfacing. I bridge the gap between mobile software and physical devices.
✅ Real-Time Mobility Systems: Advanced integration of Google Maps APIs, custom geofencing, driver-passenger synchronization, and high-performance persistent background GPS polling.
✅ Production Backend & Cloud Layers: Structuring secure authentication and dynamic real-time querying via full Firebase Suite (Firestore, Realtime DB, Cloud Functions) and Node.js.
✅ UI/UX Transformation: Pixel-perfect translation of high-fidelity Figma layout prototypes into fluid, responsive, and lightweight Flutter interfaces.
🚀 Real-World Problems I Have Solved:
🚖 Bypassing OS Background Restrictions: Standard push notifications often fail under strict mobile OS sleep limits. I engineered a custom VoIP notification architecture that bypasses iOS and Android background sleep protocols, guaranteeing time-critical driver pickup alerts and hardware alarms trigger instantly regardless of the application state.
🚗 Dual-Layer Connection Resiliency: For a smart car rental platform, connection drops can break user experience. I designed a hybrid MQTT + BLE infrastructure where MQTT handles primary commands and the application automatically falls back to offline BLE when network connectivity hits zero, ensuring uninterrupted remote vehicle control.
📉 Infrastructure Cost Optimization: Building a production app shouldn't break the bank. I maintained near-zero Firebase infrastructure overhead for a live production health application through custom synchronization logic and data pooling mechanisms, demonstrating cost-aware engineering.
⚙️ My Technical Stack:
* Languages & Frameworks: Flutter, Dart, Native Android & iOS (platform channels)
* State Management: Riverpod, BLoC, Provider, and GetX
* Architecture: Clean Architecture, MVVM, Multi-project structuring
* Protocols & IoT: BLE, Classic Bluetooth, MQTT, WebSockets, Arduino Interfacing
* Database & Cloud: Firestore, Firebase Realtime Database, Cloud Functions, PostgreSQL, Node.js
*Payments & APIs: Stripe, PayPal, Core RESTful APIs integration
📱 Shipped Production Footprint (Available on Stores):
*Smart Car Rental (IoT/BLE): Remote vehicle hardware control platform utilizing hybrid data pipelines.
*Ride-Sharing (Real-Time Location): High-frequency live tracking and driver dispatch mobility network.
*Driver Dispatch Ecosystem: Fleet management, dynamic routing, and background sync platform.
I don't just write code — I own the product lifecycle. I proactively communicate throughout the process, structure maintainable systems, and collaborate easily with your backend teams on API design.
📩 Send me your project requirements — I'll respond within 24 hours with a clear plan.
Steps for completing your project
After purchasing the project, send requirements so Mounim can start the project.
Delivery time starts when Mounim receives requirements from you.
Mounim works on your project following the steps below.
Revisions may occur after the delivery date.
Issue Assessment
You share your codebase or describe the issue. I review and identify root causes before any fixes begin — no guessing, no wasted time.
Fix & Optimization
I implement fixes with clean, maintainable code. Every change is documented so you understand exactly what was done and why.