IoT Product Development | Embedded Linux | Edge Gateways | Firmware | Cloud | Mobile Apps I help companies build & launch end-to-end IoT products — from sensor/firmware to cloud and dashboards. 15+ years experience | Delivered 50+ IoT/Embedded projects | $100K+ earnings on Upwork ✅ What We Build ✔ IoT Devices & Edge Gateways - Embedded Linux (Yocto/Buildroot), bootloader, kernel & device drivers - BLE / LoRa / ZigBee / Thread / UWB / WiFi / LTE connectivity - Secure firmware (Secure Boot, Verified Boot, OTA/FOTA updates) ✔ Firmware & Microcontroller Development - ESP32, STM32, Nordic (nRF), NXP, Microchip, SiLabs - Sensor interfacing, low-power, battery optimized firmware ✔ Cloud & Dashboards - AWS IoT, Azure IoT, Google IoT, MQTT - Grafana dashboards, Web + Mobile apps (Flutter / MERN) ✔ Full-stack delivery (Hardware → Firmware → Cloud → App) - PCB design + Prototyping - Secure Device-to-Cloud communication - REST APIs, integrations, data analytics ⭐ Some of our notable Projects in a nut shell 🔹 Life Smarter – Consumer Home Security Edge Gateway We developed a highly customized security solution for consumer home security, enabling real-time intrusion, fire, theft, and burglary detection with automated police dispatch. The system is built on the Dusun 210-F Edge Gateway with Rockchip RK3328, integrating LoRa, Zigbee, Z-Wave, BLE, WiFi, LTE, and Hardware Security Modules (HSM) for encrypted communications. The firmware supports Secure Boot, AVB, DM-V, Rootfs encryption, and A/B firmware updates via Mender to ensure a highly secure and reliable system. 🔹 Custody Protect – IoT Smart Handcuff We recently developed an IoT Smart Handcuff used for monitoring prisoners in custody in the USA. Custody Protect helps police and prison monitoring officers track each prisoner’s health status and detect violations of predefined conditions. Our team developed the entire end-to-end stack – backend, user apps, firmware, and PCB design. The ESP32 interfaces with multiple components like RFID, LoRaWAN, BLE, WiFi-BLE Mesh Network, and UWB to securely transmit data to the cloud. 🔹 Device Thread – OpenWRT & Intel NUC-Based Edge Server We built an Edge Gateway solution where OpenWRT powers a captive portal for user activity logging and intelligent bandwidth management, including IP-based controls. An Intel NUC running Ubuntu functions as a robust OTA server for seamless updates and hosts a local server for secure Smart TV management and Automated Device Binding (ADB) operations. This setup ensures efficient, secure, and scalable network management for enterprise deployments. 🛡 Why clients choose me ✅ Production-grade experience ✅ Secure OTA updates, hardware security modules (ATECC608) ✅ Guaranteed delivery — clear milestones, demo every sprint “We didn’t just get code. We got a complete product ready for deployment.” – Upwork Client 💬 Let’s discuss your project Send your requirement, even if it's just an idea — I can help shape the your product as your expectation.

🏅 100% 𝗝𝗼𝗯 𝗦𝘂𝗰𝗰𝗲𝘀𝘀 𝗦𝗰𝗼𝗿𝗲 | 🏅 𝗢𝘃𝗲𝗿 $300𝗸+ 𝗘𝗮𝗿𝗻𝗲𝗱 | 🏅 9,930+ 𝗛𝗼𝘂𝗿𝘀 𝗪𝗼𝗿𝗸𝗲𝗱 🛡️ Senior Mobile App Developer | iOS & Android • Cross-Platform | Swift • Kotlin • Flutter • React Native Hello, I am a senior mobile app developer with over a decade of experience building high-performance, scalable, and secure mobile applications for businesses across industries. My work focuses on delivering clean, maintainable code, intuitive UI/UX, and robust integrations that ensure long-term reliability and growth. 🔹 Core Technical Expertise Native iOS Development (Swift, SwiftUI, Objective-C) • Advanced UI with SwiftUI • Secure authentication, Keychain, biometrics • In-App Purchases, StoreKit, subscription systems • Push notifications, background tasks, app lifecycle handling Native Android Development (Kotlin, Java) • Jetpack Compose, Material Design • Google Billing, Firebase integration • Secure data handling, encryption, offline caching • Device hardware integrations (GPS, camera, sensors) Cross-Platform Development • Flutter / Dart for fast, consistent multi-platform delivery • React Native for modular, scalable hybrid apps • Adaptive layouts, responsive UI, optimized rendering 🔹 Backend, Cloud & Integrations • Firebase: Auth, Firestore, Cloud Storage, FCM, analytics • Supabase: Auth, Postgres DB, RPC, edge functions • REST APIs, GraphQL APIs, WebSockets • AWS, GCP, Node.js, Python-based backend integration • AI/LLM integrations: OpenAI API, chatbots, voice AI 🔹 Advanced App Features Delivered • Real-time chat, messaging systems • Geo-tracking, mapping, route optimization • Media streaming, audio/video recording • Subscription apps (RevenueCat, Google Billing) • E-commerce app functionality • Custom dashboards, gamification, rewards • Highly secure login & data encryption 🔹 Engineering Process • Clean architecture (MVVM/MVI/Bloc) • CI/CD pipelines, testing, profiling • Milestone-based delivery with transparent updates • App Store & Play Store launch support • Full documentation + post-launch support 🔹 AI & LLM Expertise • OpenAI (GPT-4/5), Claude, Gemini • Prompt Engineering & Optimization • Tool / Function Calling • Autonomous AI Agent Development • Multi-Agent Systems • Retrieval-Augmented Generation (RAG) • Context & Memory Architecture Design 🔹 AI Frameworks • LangChain • LlamaIndex • CrewAI • AutoGen • Semantic Kernel • Hugging Face 🔹 Programming & Backend • Python (Advanced) • FastAPI • REST API Development • Async Programming • API Integration 🔹 Vector Databases & Data Handling • Pinecone • FAISS • ChromaDB • Weaviate • PostgreSQL • MongoDB 🔹 AI Solutions Development • AI Chatbots (Custom & Enterprise) • AI Sales & Lead Qualification Agents • Document Processing & Data Extraction • Knowledge Base AI Assistants • Workflow Automation Systems • AI SaaS Application Development 🔹 Deployment & DevOps • Docker • AWS / GCP • Vercel • CI/CD • Production Deployment & Scaling If you’re seeking a senior, dependable, and highly skilled mobile app developer to build or scale your iOS/Android application, I’d be glad to help you bring your vision to life. Thanks, Eshan Keywords# ------------- Mobile App Development, iOS Development, Android Development, Cross-Platform App Development, Hybrid App Development, Native App Development, React Native Development, Flutter Development, Swift Programming, Java/Kotlin Programming API Integration, UI/UX Design, Database Management, Front-End Development, Back-End Development, Agile Methodology, Git Version Control, App Testing and QA, Firebase Integration, Cloud Services (AWS, Azure) E-commerce App Development, Social Networking App Development, Fitness App Development, Game Development, Educational App Development, Travel App Development, Health & Wellness App Development, Finance/Budgeting App Development, AR/VR App Development, IoT Integration Project Management & Collaboration: Requirement Analysis, MVP Development, Deployment and App Store Submission, Continuous Integration/Continuous Deployment (CI/CD), User Feedback Implementation, Beta Testing "App Developer for Hire", "Freelance App Developer", "Experienced Mobile Developer", "Custom App Development", "Professional App Development Services"

Need to ship faster without losing control of quality? I lead a vetted, AI-native team that takes real ownership of your product and starts moving the needle in days, not weeks. I help founders, CTOs, and product owners turn roadmaps into shipped, scalable products. My team works as true partners, not order-takers — we obsess over the user, sweat the details, and make decisions through the lens of your business goals, not just the ticket in front of us. Here's what working with us looks like: thorough testing plans and clear documentation so quality holds as you grow, daily updates that report real progress instead of activity, and tight alignment to your priorities so every sprint moves the product forward. We build for scale from day one, so what we ship today doesn't become tomorrow's bottleneck. We've delivered across the full spectrum: consumer apps with 1M+ downloads like Christian Dating For Free, the marketing site for unicorns like Deepgram, and complex enterprise systems like Arriba Data Systems, a leading California platform for workers' compensation. That range means we're as comfortable with a focused 2–3 week build as we are with ongoing, flexible engagements that run for years. We're as comfortable with a focused 2–3 week build as we are with ongoing, flexible engagements that run for years. We're stack-agnostic across 100+ technologies — whether your product needs TypeScript, Dart, C#, or something else, we bring the right tools and senior engineers to the problem. The constant isn't the language; it's the ownership, accountability, and product thinking we bring to every engagement. You get the speed and flexibility of staff augmentation with the structure, visibility, and ownership of a real delivery partner. Can you share a bit about your product so we can schedule a quick 30-min call to confirm we're a great fit to work together?

I’m a mobile app developer with 8+ years of experience building, fixing, and maintaining apps for iOS and Android. I specialize in Ionic, Capacitor/Cordova, React Native, and Flutter, and have published multiple apps to both the Google Play Store and Apple App Store. I don’t just build apps — I help solve problems when things aren’t working. What I can help with: Fixing build issues (Xcode, Android Studio, Gradle) Debugging Cordova / Capacitor plugin problems Creating or modifying custom plugins API integration and backend connectivity Firebase integration (auth, push notifications, database) App Store / Play Store deployment and fixes Migrating legacy Ionic / AngularJS apps to modern frameworks I’ve developed custom solutions like a barcode + speech VIN scanner and have extensive experience working with device features and native functionality. I also take on small or urgent tasks, whether it’s fixing a crash, resolving a plugin issue, or getting your app unstuck quickly. My background in DevOps and backend systems (AWS, REST APIs, MySQL/Postgres) allows me to handle both frontend and backend issues when needed. If your app is broken, stuck, or needs improvement, I can help get it working efficiently.

𝐇𝐞𝐫𝐞'𝐬 𝐭𝐡𝐞 𝐝𝐞𝐚𝐥: I've shipped 80+ Flutter apps for startups and businesses across the US, EU, and MENA, production apps with real users, real payments, and real scale. You share your idea, I tell you exactly how to build it and I stay your developer from day one to launch. Apps that go live, generate revenue, and scale without needing a rebuild six months later. ⭐ Top Rated Plus (Top 3%) | 100% Job Success | 100+ Projects | 7+ Years Experience 𝗪𝗵𝗮𝘁 𝗪𝗼𝗿𝗸𝗶𝗻𝗴 𝗪𝗶𝘁𝗵 𝗠𝗲 𝗔𝗰𝘁𝘂𝗮𝗹𝗹𝘆 𝗟𝗼𝗼𝗸𝘀 𝗟𝗶𝗸𝗲: You get one point of contact. I lead development personally, give you weekly demos on a staging build and don't disappear after handoff. For larger projects I bring in a trusted team (Devs, PM, QA, DevOps), but you're always connected to me. Post-launch, I offer 4 weeks of free support so you're never left stranded after go-live. 𝗦𝗼𝗺𝗲 𝗼𝗳 𝗪𝗵𝗮𝘁 𝗜'𝘃𝗲 𝗕𝘂𝗶𝗹𝘁: → 𝗔𝗿𝗲𝗻𝗮 𝗦𝗰𝗼𝗽𝗫 FinTech booking platform processing $100K+ monthly in padel reservations across Gulf markets. Built on Stripe Connect with multi-venue payments architecture. → 𝗕𝗕𝗫 𝗠𝗮𝗿𝗸𝗲𝘁𝗽𝗹𝗮𝗰𝗲 B2B platform running 10K+ daily active users across Oceania. Full multi-vendor commerce infrastructure. → 𝗦𝘂𝗯𝘃𝗲𝗻𝘁𝗶𝗼𝗻 𝗠𝗮𝗿𝗼𝗰 𝗟𝗮𝗶𝘁 National government subsidy system serving cooperatives, suppliers, drivers, and a national federation. Secure multi-role architecture with compliance workflows, trusted by a national government. 𝗔𝗽𝗽𝘀 𝗜 𝗕𝘂𝗶𝗹𝗱: ✅ Food & grocery delivery (like Uber Eats) ✅ On-demand service & ride booking (like Uber) ✅ Marketplace & B2B platforms ✅ Healthcare & fitness apps ✅ E-commerce with admin panels ✅ Social & community apps ✅ Fintech & payment platforms ✅ SaaS & productivity tools ✅ AI-powered mobile apps ✅ Government & compliance systems ✅ Real estate & property platforms ✅ EdTech & e-learning apps ✅ Travel & booking platforms ✅ On-demand delivery platforms 𝗛𝗼𝘄 𝗬𝗼𝘂𝗿 𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗠𝗼𝘃𝗲𝘀 𝗙𝗿𝗼𝗺 𝗜𝗱𝗲𝗮 𝘁𝗼 𝗟𝗶𝘃𝗲 𝗣𝗿𝗼𝗱𝘂𝗰𝘁: Discovery call → I understand your idea, goals, and technical feasibility. Scope & PRD → Clear feature list, locked before development starts. Proposal → Detailed estimate with timeline, milestones, and delivery roadmap. Agile build → Weekly updates, staging demos, milestone-based delivery. 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸: Mobile: Flutter (BLoC / GetX), React Native, iOS, Android Backend: Node.js, Express, FastAPI Frontend: React.js, Next.js, Angular Databases: PostgreSQL, MongoDB, Supabase, Firebase, Redis Cloud & DevOps: AWS, DigitalOcean, Docker, CI/CD via GitHub Actions AI: OpenAI, Claude, Gemini, chatbots, agents, LLM-powered features, n8n Ready to build? I offer a discovery 𝟯𝟬-𝗺𝗶𝗻𝘂𝘁𝗲 𝗰𝗼𝗻𝘀𝘂𝗹𝘁𝗮𝘁𝗶𝗼𝗻, we discuss your idea, I give you an honest technical opinion and we define the right approach before you commit to anything. No pressure, no obligation. Click 𝗜𝗻𝘃𝗶𝘁𝗲 𝘁𝗼 𝗝𝗼𝗯 or the 𝗛𝗶𝗿𝗲 button and let's talk. Highlighted Skills: Full Stack Developer | Expert Full Stack Developer | Full Stack Mobile App Developer | Full Stack AI Developer | Expert Full Stack Mobile App Developer | Mobile Developer | React Native| iOS Developer | Android App Developer | Mobile App Development | Cross platform development | iOS App Development | iOS App | Android App Development | Hybrid App development | Mobile App Development Consultation | AI App Developer | AI App | Mobile Developer | App Developer | Mobile App Development Consultation | IT Consultation | App Developer | AI App Developer | Flutter | Dart | Flutter Dart | Smartphone | User Authentication | In App Purchases | API Integration | Flutter Firebase | iOS Development | Android App Development

Struggling with slow, hard-to-scale web apps that hurt growth? With 25+ years as a full stack developer, I've delivered 700+ React and Node.js projects and built systems handling 10M+ API requests/month for SaaS, marketplaces, and enterprise teams. I create production-ready platforms with fast UIs, secure APIs, and automation built to scale. 🎯 HOW I CAN HELP YOU FULL STACK WEB APPLICATION DEVELOPMENT Build scalable web apps that support growth without slowing down as traffic, features, or users increase. I’ve delivered 700+ projects and systems handling 10M+ API requests per month, with production results across SaaS, marketplaces, CRM, fintech, and enterprise platforms. REACT FRONTEND DEVELOPMENT Increase user engagement with fast, responsive interfaces that feel smooth on every device. My React and Next.js builds have achieved 90–100 Lighthouse scores on 30+ apps, helping clients improve speed, SEO, and conversion potential. NODE.JS API DEVELOPMENT Protect your product with secure, scalable APIs that keep data flowing and systems stable. I build REST, GraphQL, and WebSocket backends with Node.js, NestJS, Redis, and PostgreSQL for high-traffic applications, real-time dashboards, and automation platforms. SAAS PLATFORM DEVELOPMENT Launch and scale SaaS products with architecture built for long-term maintainability and faster feature growth. I’ve shipped SaaS systems with CI/CD, monorepos, serverless services, and AI integrations that reduce delivery friction and support rapid iteration. WEB AUTOMATION AND INTEGRATIONS Automate repetitive work and reduce manual operations across sales, support, data sync, and internal workflows. I’ve integrated 200+ APIs and built browser automation with Playwright, Puppeteer, and queue-based processing for reliable, scalable execution. 🏆 Full Stack Developer 🎖 React Developer 🎖 Node.JS Developer ✉️ 𝗠𝗘𝗦𝗦𝗔𝗚𝗘 𝗠𝗘 𝗢𝗡 𝗨𝗣𝗪𝗢𝗥𝗞 Have a SaaS, AI, or full stack web app in mind? Message me on Upwork for a free consultation and a clear plan to move your project forward. I typically respond within 4 hours, and urgent projects are welcome. 𝗛𝗼𝘄 𝗜 𝗪𝗼𝗿𝗸 I build interfaces in React and Next.js, connect them to Node.js APIs, and keep data reliable with PostgreSQL and MongoDB. I use TypeScript and Express.js for maintainable code, AWS for deployment, and Docker to keep environments consistent. I track progress in Jira and ship with GitHub Actions, then validate performance and fixes through testing and monitoring. I build React and Next.js web applications, connect Node.js APIs, and streamline TypeScript workflows for SaaS products, marketplaces, and internal tools.

Hello, I’m Ivan - a front-end developer specializing in Angular and Ionic, with 4+ years of experience building high-quality web and cross-platform mobile applications. I primarily work with startups and small businesses, helping them design, build, and scale reliable digital products — without unnecessary complexity. I help clients turn ideas into real products, as well as improve and extend existing web and mobile applications - from building responsive web apps to developing cross-platform mobile solutions and handling deployment on the App Store and Google Play. What I can help you with: ✓ Building modern, responsive web applications with Angular ✓ Developing cross-platform mobile apps using Ionic + Capacitor ✓ Converting and optimizing existing platforms for mobile ✓ Integrating Firebase (authentication, database, social logins) ✓ Working with native features (camera, location, push notifications, etc.) ✓ Publishing apps and managing updates on both app stores ✓ Maintaining, optimizing, and scaling existing applications I’ve worked in different environments - independently and in teams (remote, hybrid, and on-site) — and I focus on clear communication, clean code, and delivering dependable results. I’m continuously improving my skill set and currently expanding into Supabase and Shopify to better support current and new clients. 📩 References or recommendation letters are available upon request. Feel free to reach out with your ideas or current app, and I can help you with next steps.

Hey 👋 I’m Anastasiia, a Senior Software Engineer specializing in cross-platform React Native app development for operations platforms, SaaS products, and real estate / field-service teams, from MVP to production-ready apps on iOS and Android. I help teams turn product ideas into stable, scalable mobile systems that users actually rely on daily. 🚀 What I Build with React Native Cross-platform mobile apps (iOS + Android) with a mobile-first UX Offline-first workflows with reliable data sync Push notifications (real-time updates, alerts, user engagement) Payments & subscriptions (in-app purchases, Stripe, Apple/Google Pay) Maps, geolocation & route-based features BLE / device integrations when hardware is involved Secure API integrations (often with .NET / REST / GraphQL backends) Admin dashboards (web companion panels for operations teams) 🧠 How I Work Discovery → clarify product goals, users, and edge cases Architecture → define scalable mobile structure (state, data flow, API design) Milestone delivery → iterative builds with clear scope per stage Weekly demos → working builds you can test continuously Store release → full App Store / Google Play preparation and deployment 💡 Why this approach works You get a production-ready architecture early, not just UI screens The app is designed to scale from MVP → full platform without rewrites Mobile performance, reliability, and UX are treated as core requirements, not afterthoughts You always know what’s being built and why, at every step If you already have an app idea, a prototype, or even an existing codebase, share it with me. I’ll map out the fastest and cleanest path to get it into production.

⭐ Top Talented Latin American Developers for US-based tech companies ⭐ When you partner with us, you get highly talented developers and clear, top-notch communication from day one. Our responsive team hits the ground running, bringing immediate value to your project. If you're looking for builders who get things done, you've found us. We've proudly helped US-based SaaS products scale and succeed for over 10 years. ✅ Why work with us: 🎯Experts in SaaS development with a record of successful products 💰Over $100M raised by apps built by our team 🎯Over 14 years as a developer and over 10 years leading my company 🌎Located within US time zones 🏆Top developer in Latin America and Houston according to Clutch ⭐4.8/5 rating on Clutch 🗣️What my clients have said about me and my team: "They are very talented and skilled developers that had friendly and fun personalities." "They took a hands-on approach to the project, which made me confident in their insights." “They developed our product from scratch and it is tremendous.” “The team from Bixlabs is incredibly personable, friendly, caring, and thoughtful.” Let's get in touch to see if we're the right fit for your vision! Looking forward to hearing about your project🚀

I'm specialize in delivering high-quality mobile app solutions tailored to meet the unique demands of various industries. With a proven track record across multiple domains, I have created scalable, user-friendly, and innovative applications. Industries Catered 1. Healthcare - Patient management and appointment scheduling apps - Telemedicine platforms for virtual consultations - Health and fitness trackers with wearables integration 2. Real Estate - Property listing and management apps - Virtual property tours with AR/VR - Lead generation and CRM tools for agents 3. Sports - Live score and event-tracking platforms - Fan engagement apps with personalized content - Fitness and training applications for athletes 4. Food Delivery & Taxi booking - Restaurant aggregation and food delivery apps - Real-time order tracking and driver management - Loyalty programs and in-app payments 5. Note-Taking & Productivity - Intuitive note-taking applications with sync capabilities - Collaborative tools for task and project management - Integrated multimedia (voice, video, and attachments) - Quiz Apps - Calendar apps 6. Booking & Reservations - Travel booking apps for flights, hotels, and tours - Event ticketing and reservation systems - Personalized booking platforms with dynamic pricing - Location-Based Applications 7. Real-time navigation and tracking apps - Geo-fencing and targeted marketing solutions - On-demand services using location intelligence And Beyond! 8. E-commerce platforms - Educational apps for interactive learning - Social networking and community platforms 9. Entertainment & Media - Music apps connecting artists & fans 10. Agriculture & legal services - Apps for farmers 11. Construction & Infrastructure - Construction related & Vehicle photography apps where user can book an inspection along with construction work. VIN implementation, vehicles search, dealers accounts 12. Human Resources & Recruitment - Apps for school management & HR related work. Tech Stack Expertise Cross-Platform Development 1. Flutter Efficient and expressive for building visually stunning apps on iOS and Android with a single codebase. 2. React Native Highly performant and modular, perfect for delivering native-like apps quickly. 3. Hybrid Apps Cost-effective solutions built using frameworks like Ionic and Cordova. 4. Native Development a) Swift (iOS) For sleek, robust, and high-performing iOS applications. b) Kotlin (Android) Modern and feature-rich, ideal for Android-specific development. Backend & API - Node.js - Scalable and fast, suitable for real-time apps and APIs. - Open AI, Deepseek AI, Gemini Laravel A secure and elegant framework for robust backend architecture. Why Choose Me? - User-Centric Approach: Our designs prioritize intuitive interfaces and exceptional user experience. - Agile Development: Iterative processes to ensure faster delivery and flexibility. - Domain Expertise: Proven experience across diverse industries and app types. - End-to-End Solutions: From ideation to deployment and post-launch support. - Figma/Adobe photoshop tool for app/web designing Let us help you bring your mobile/web app ideas to life with cutting-edge technology and industry expertise!