Hire the Best Mobx Developers

Senior Software Architect specializing in secure systems and IoT Sec solutions with 15+ years of experience. I architect and deliver end-to-end nfc solutions, from embedded firmware to cloud-based backend systems. 🎯 CORE EXPERTISE IOT Systems - NFC Solutions: Reader/Writer, HCE, Digital Wallets (Android/iOS) - Smart Cards: JavaCard, MIFARE, DESFire, NTAG,Global Platform,GP,JCOP,Secure Element - Security: PKI, FIDO, Secure Element,HSM, PCI-DSS Compliance - RFID Systems: Asset Tracking, Access Control - EMV Payment: L1/L2/L3 Kernel Development & Certification - Microcontrollers: ESP32, STM32 (WiFi/BLE, RTOS) - Firmware: Secure Bootloader, OTA Updates, Real-time Systems - Industrial Applications: POS Terminals, Vending Machines, Access Control - IoT Architecture: Sensor Integration, Remote Management Full-Stack Development - Backend: Node.js, REST APIs, Database Design (SQL/NoSQL) - Cloud Services: Firebase, AWS/Azure/GCP Deployment - Mobile: Android (NFC APIs), iOS (CoreNFC), React Native - Desktop: Qt, .NET, Cross-platform Applications - Languages: C/C++, JavaScript/TypeScript, Java, C# 💼 SIGNATURE PROJECTS ✅ ESP32 IoT Systems - Created NFC-enabled payment solution with cloud integration - Built secure firmware with OTA update capabilities - Integrated Firebase for real-time data synchronization ✅ Cross-Platform Digital Wallet - Developed mobile wallet supporting EMV contactless payments - Implemented HCE and Secure Element integration - Built Node.js backend with Firebase authentication ✅ Enterprise RFID Solutions - Designed asset tracking systems for industrial clients - Implemented access control with NFC/RFID readers - Deployed cloud-based management platform ✅ EMV Payment Terminal Solutions - Developed EMV L2 & L3 kernel for contact/contactless terminals - Achieved EMVCo certification for payment applications - Implemented secure key management and transaction processing 🔧 TECHNICAL STACK Hardware: ESP32, STM32, NFC Readers, RFID Systems Backend: Node.js, Express, Firebase, REST APIs Database: MongoDB, PostgreSQL, MySQL, Firestore Cloud: Firebase, AWS, Azure, Docker deployment Mobile: Android, iOS, React Native Desktop: Qt, .NET, Windows/Linux Security: PKI, FIDO, PCI-DSS, Secure Boot 📋 CERTIFICATIONS & STANDARDS EMVCo, PCI-DSS, PBOC, Global Platform, ISO 14443 I deliver production-ready solutions with clean code, comprehensive documentation, and ongoing support. Available for both fixed-price projects and long-term contracts.

Senior OTT & Smart TV Platform Architect | Roku | Tizen | LG webOS | Apple TV | Android TV | OTT Monetization, Website Ads & AI Solutions 🚀 I Build Scalable OTT & Smart TV Streaming Platforms I help media companies, startups, and enterprises design, develop, and launch high-performance OTT applications across Roku, Samsung Tizen, LG webOS, Vizio, Apple TV, Android TV, and mobile platforms. From architecture planning to store deployment, I deliver production-ready streaming solutions optimized for performance, monetization, and long-term scalability. If you're building a serious OTT product — you're in the right place. 📺 Platform Expertise • Roku Channel Development (BrightScript & SceneGraph) • Samsung Tizen TV Apps • LG webOS TV Apps • Vizio Smart TV Apps • Apple TV (tvOS) • Android TV • iOS & Android Mobile Apps • Web Streaming Platforms & Admin Panels I deeply understand TV remote navigation, focus management, 10-foot UI design, and hardware limitations — which most developers struggle with. 🎬 OTT & Streaming Architecture I specialize in complete OTT workflows: • Live TV & VOD Platforms • HLS & MPEG-DASH Integration • DRM (Widevine) • EPG (Electronic Program Guide) • Multi-profile & Authentication Systems • Dynamic QR Login for TV Apps • Video Player Customization • Performance Optimization for TV Hardware 💰 Monetization & Revenue Systems I implement revenue-focused OTT platforms: Monetization Models • SVOD • TVOD • PVOD • AVOD • In-App Purchases Payment Integration • Roku Pay • Fire TV IAP • Stripe • PayPal • PayU 📢 Advanced Ads Integration • Google PAL SDK, Sabio Ad In roku • DAI (Dynamic Ad Insertion) • VAST Tag Integration • AWS MediaTailor • Pre-roll / Mid-roll / Post-roll Ads • Custom Video Ad Workflows ☁ Backend, Cloud & Infrastructure • Node.js, PHP, Laravel • REST API Integration • MySQL, PostgreSQL • AWS (EC2, S3, Media Services, SNS, Lightsail) • Firebase • Vimeo (VHX) Integration • CDN Integrations (Bunny, Gumlet, Limelight, Field59) 📊 Analytics & Tracking • GA4 • MUX • Segment I build data-driven streaming platforms with proper event tracking and performance monitoring.

Full Stack Developer (7 Years) | Full-Time Freelancer I provide one-stop software solutions for startups and businesses. Instead of hiring separate frontend and backend developers, I build your entire product from the ground up—from server architecture to cross-platform clients. What I Deliver: - End-to-End Lifecycle: Architectural design - Backend/API - Pixel-perfect UI - Market Release. - Cross-Platform Expansion: Seamless apps for Android, iOS, Web, Desktop, and Wear OS with high performance. - Scalable Backend Systems: Fast, reliable, and maintainable backend services powered by Rust or Kotlin for long-term product growth. - IoT & Hardware Expertise: Advanced integration for Android-based IoT clients, including Kiosk Mode, Serial Port communication, etc. - Fast Delivery: Skilled in leveraging AI agents to speed up development, reduce repetitive work, and quickly turn ideas into production-ready features. Core Tech Stack: - Frontend & Mobile: Kotlin Multiplatform, Compose Multiplatform - Backend: Axum (Rust), Ktor (Kotlin) I turn sketches into flawless, scalable apps. As a full-time freelancer, I guarantee fast, transparent communication and dedicated availability. Let’s build something great together.

"Hands-down, one of the best devs I've worked with on Upwork." - ScreenStory Senior C++ Engineer with 18+ years building real-time and embedded systems, multimedia pipelines, and high-performance desktop applications. Top Rated Plus on Upwork - 9,900+ hours and $400K+ earned across 28+ long-term engagements. MORE FROM CLIENTS "Excellent in every regard: communication, work, making logical inferences, asking good questions. Truly the top of the top." - Skan AI "A very reliable, knowledgeable and professional developer who is a pleasure to work with." - Clickdrive WHAT I BUILD - Rich UI/UX and high performance desktop applications on C++/Qt, C# .Net Framework WPF/UWP/WinUI XAML - Multimedia & Real-Time Screen recording engines (Desktop Duplication API, Windows Graphics Capture, GDI), low-latency video/audio pipelines on FFmpeg, WebRTC streaming with custom builds and Janus SFU, DirectX GPU compositing with custom pixel shaders, audio DSP with RNNoise. - Embedded & HMI Industrial automation, locomotive on-board systems, HMI on Qt/QML, ModBus / RS-232/485 / Can. Codex industrial labeling software for ALE sas - Real-Time Backends SCADA alarm-module backend with high-throughput low-latency event handling, gRPC, multithreaded C++17/20 architecture. - Native Library Bindings C++ cores with bindings to Electron (Node-API), Flutter (FFI), Python. Cross-platform Windows and macOS. - Engineering Infrastructure CI/CD on Jenkins and Azure DevOps, self-hosted Sentry deployment, CrashRpt, automated quality gates, structured Git workflows. HIGHLIGHTS - 7 years as lead engineer on a portfolio of consumer multimedia and document-processing applications (architecture + implementation across a team of 3) - Locomotive driver HMI deployed on operational locomotives in real-world service - Automated engine test bench: reduced testing time by 40%, increased throughput from 6 to 10 engines per shift - Currently leading C++/MFC -> Qt migration on the Ham Radio Deluxe product suite (41,500+ active users) Core stack: C++ (17/20) · Qt (QML, QWidgets) · CMake · vcpkg · FFmpeg · WebRTC · Desktop Duplication API · Media Foundation · DirectX · MFC · gRPC · Multithreading · ModBus · Windows Embedded · C# .NET · Electron Node-API · Jenkins · Azure DevOps · Sentry WHAT I'M LOOKING FOR Long-term engagements (6+ months) where deep C++ expertise and architectural ownership matter. Equally comfortable in greenfield architecture and rescuing legacy codebases. Available for fixed-price projects and hourly contracts.

Hello! I'm a passionate and highly skilled Mobile App Developer with over 8 years of experience in building innovative, high-performance mobile applications for startups, businesses, and enterprises. I specialize in both native and cross-platform technologies to deliver apps that run smoothly on iOS and Android devices, providing native-like experience with efficient development. My technical stack includes: 🦋 Flutter & FlutterFlow: Beautiful cross-platform apps with hot reload and native performance. ⚛️ React Native: Hybrid apps with JavaScript/TypeScript, Expo, and native modules. 🍎 Swift / SwiftUI / Objective-C: Modern native iOS apps with declarative UI. 🤖 Kotlin / Java / Jetpack Compose: Native Android apps with Material Design and modern architecture. Backend and cloud skills: 🔥 Firebase: Full suite (Auth, Firestore, Cloud Functions, Storage, Analytics). ☁️ AWS Amplify, Lambda, S3, Cognito. 💻 Node.js, Express, NestJS backends. 📡 GraphQL & REST APIs. 🗃️ Databases: MongoDB, PostgreSQL, MySQL, SQLite, Realm. Real-time features, push notifications, offline support, payments (Stripe, PayPal, RevenueCat), and social auth. Successful projects include: 🛒 E-commerce apps with cart, payments, and tracking. 💬 Social apps with chat, feeds, and notifications. 🏋️ Fitness & health apps with activity tracking and wearables. 📚 Education apps with video, quizzes, and progress tracking. 💰 Finance apps with secure wallets and charts. 🚀 On-demand apps (ride-sharing, delivery, booking). I use efficient state management (Provider, Riverpod, Bloc, Redux, MobX) and follow MVVM / Clean Architecture. Apps are responsive, accessible, localized, and include dark/light themes and offline support. Additional experience: AI/AR integration, monetization (AdMob, subscriptions), CI/CD (fastlane, Bitrise, Codemagic), and App Store / Google Play submission. I offer clean, well-documented, scalable code, clear communication, and timely delivery. Ready to build or improve your mobile app. Let's discuss your project! 🚀 Available for long-term or one-time work. Thanks for profile reviewing.

I build computer vision pipelines that run reliably in production — not just in demos. 20 years C++ | Jetson optimization | TensorRT ────────────────────────────────────── WHAT I JUST BUILT (verified numbers): ────────────────────────────────────── VisionGuard AI — multi-stream edge AI pipeline on Jetson Orin NX 16GB (JetPack 6.2): - 3 × 1080p RTSP streams @ 30fps (with UI) - 4 × 1080p RTSP streams @ 30fps (headless) - CPU load: 11.4% — nearly idle - GPU utilization: 98.8% - Power draw: 22.3W total - Inference latency: 22–25ms per frame - Uptime: 24/7 stable Pipeline: FFmpeg NVDEC → DRM_PRIME DMA-BUF → EGL/CUDA device ptrs → TensorRT YOLOv11 → GPU NMS Zero CPU↔GPU memory copies between stages. ────────────────────────────────────── WHAT I'M GOOD AT: ────────────────────────────────────── - Zero-copy GPU pipelines (NVDEC, DMA-BUF, CUDA) - TensorRT optimization — INT8/FP16 quantization - Multi-stream RTSP on edge hardware - C++ production code — multi-threaded, 24/7 stable - Jetson deployment — Orin, Xavier, Nano - YOLO training + custom dataset fine-tuning - Qt UI for embedded Linux applications ────────────────────────────────────── WHAT I BRING: ────────────────────────────────────── 20 years shipping production C++ code means I think about reliability, performance, and edge cases from day one — not as an afterthought. When a pipeline works in the lab but fails in production, I know where to look. ────────────────────────────────────── TECH STACK: ────────────────────────────────────── C++17, Python, TensorRT, CUDA, NVDEC OpenCV, YOLOv11/v8, PyTorch, DeepStream Qt6, FFmpeg, GStreamer, Docker Jetson Orin/Xavier/Nano, JetPack 5/6 Embedded Linux, V4L2, DRM/KMS