10/22/2026 updated
100 % available
Senior Flutter Developer
Islamabad, Pakistan
Only remote
B.Sc. Computer ScienceAbout me
Senior Flutter Engineer with 5+ years of experience and 15+ apps shipped to the App Store and Google Play. Specialities: clean architecture, BLoC/Riverpod state management, Firebase, and IoT/BLE integrations. Available for immediate start, working fully remote.
FlutterGoogle FirebaseDart
Flutter & Dart Development
Expertise in Flutter and Dart for cross-platform iOS and Android development, including responsive UI, animations, i18n/RTL, and platform channels (Kotlin/Swift). Over 15 production apps shipped to the App Store and Google Play.
Clean Architecture & State Management
Deep knowledge of Clean Architecture, MVVM, SOLID principles, feature-first modules, repository pattern, Provider, BLoC/Cubit, Riverpod, dependency injection, and go_router for scalable and maintainable mobile applications.
Firebase & Cloud Integration
Proficiency in Firebase services including Firestore, Auth, Cloud Messaging, Storage, Crashlytics, Remote Config, security rules and data modelling, as well as AWS (S3, CloudFront) for cloud-based mobile solutions.
Real-time & IoT Technologies
Hands-on experience with WebSockets, Socket.IO, MQTT, BLE (flutter_blue_plus), ESP32 telemetry, NFC, and background services for real-time and IoT-driven mobile applications.
CI/CD & Delivery
Practical use of Git, GitHub, GitHub Actions, CI/CD pipelines, build flavors and signing, TestFlight, Play Console and App Store Connect, as well as unit, widget, and integration testing.
Performance Optimisation
Experience in startup and cold-start optimisation, HLS streaming latency reduction, scroll and rebuild profiling, memory management, and app-size reduction.
AI & Integrations
Integration of OpenAI/GPT APIs, Gemini, on-device ML (ML Kit pose detection), speech-to-text and dictation, RAG-style knowledge search, Google Maps, and third-party SDK integration.
Backend & Data
Working knowledge of Node.js, REST (Dio), MongoDB, Redis, SQLite, Hive, secure storage, Stripe, and In-App Purchases for full-stack mobile delivery.
Links
Portfolio: https://mhassanraza-hassandown.vercel.app
LinkedIn: https://www.linkedin.com/in/hassandown
GitHub: https://github.com/mhassanraza12
Experience
Professional experience5 - 10 years
Freelancer since2021
Languages
EnglishFluent
Project history
Lead Flutter developer on a Quran learning and memorization platform with 26 feature modules. Built audio and recitation layers, implemented offline-first Quran text, localization, push notifications and progress dashboards with an AI-assisted recitation evaluation module. Also delivered backend and web features on Node.js/MongoDB, including AI candidate-matching that cut CV-screening time 60%.
Built and shipped 15+ production Flutter apps to the App Store and Google Play. Led mobile delivery on MediTask PRO, a HIPAA-compliant clinical platform for a US healthcare provider. Mentored 8 mobile developers, applied clean architecture with BLoC/Riverpod/Provider, and delivered end-to-end solutions across healthcare, field service, fitness, streaming, ticketing and IoT.
Designed, built and published Flutter apps for Android and iOS end to end, turning ambiguous client requirements into shipped features with clean code, MVVM and Firebase, alongside B.Sc. Computer Science studies.