I'm a 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝗠𝗼𝗯𝗶𝗹𝗲 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 with 𝟭𝟯+ 𝘆𝗲𝗮𝗿𝘀 of hands-on experience building 𝟱𝟬+ 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗺𝗼𝗯𝗶𝗹𝗲 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 across iOS and Android platforms. 𝗖𝗼𝗿𝗲 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: I specialize in 𝗻𝗮𝘁𝗶𝘃𝗲 𝗶𝗢𝗦 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 (Swift, SwiftUI, Objective-C, UIKit), 𝗰𝗿𝗼𝘀𝘀-𝗽𝗹𝗮𝘁𝗳𝗼𝗿𝗺 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 (Flutter, React Native), and 𝗔𝗜-𝗽𝗼𝘄𝗲𝗿𝗲𝗱 𝗺𝗼𝗯𝗶𝗹𝗲 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀. My technical stack includes: - 𝗠𝗼𝗯𝗶𝗹𝗲 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀: SwiftUI, UIKit, Combine, Core Data, Core Animation, Jetpack Compose, Kotlin, Java - 𝗔𝗜 & 𝗠𝗮𝗰𝗵𝗶𝗻𝗲 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴: Core ML, ML Kit, TensorFlow Lite, Create ML, Vision Framework, Natural Language Processing, ARKit, OpenAI API integration, ChatGPT integration, AI chatbots, LLM integration, GPT models, on-device AI processing, image recognition, object detection, speech recognition - 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 & 𝗖𝗹𝗼𝘂𝗱: Firebase, AWS, Google Cloud Platform, REST APIs, GraphQL, Node.js, Python backends, serverless architecture, cloud functions - 𝗣𝗮𝘆𝗺𝗲𝗻𝘁 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻: Stripe, PayPal, Apple Pay, Google Pay, In-App Purchases, subscription management, payment processing - 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲: SQLite, Realm, PostgreSQL, MongoDB, Vector Databases, Core Data, Firebase Firestore - 𝗖𝗜/𝗖𝗗 & 𝗧𝗲𝘀𝘁𝗶𝗻𝗴: Xcode Cloud, Fastlane, XCTest, Unit Testing, UI Testing, TestFlight, App Store deployment, Google Play Console - 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 𝗣𝗮𝘁𝘁𝗲𝗿𝗻𝘀: MVVM, MVC, Clean Architecture, Repository Pattern, Dependency Injection 𝗪𝗵𝗮𝘁 𝗦𝗲𝘁𝘀 𝗠𝗲 𝗔𝗽𝗮𝗿𝘁: 1️⃣ 𝗔𝗜-𝗣𝗼𝘄𝗲𝗿𝗲𝗱 𝗠𝗼𝗯𝗶𝗹𝗲 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀 - I build intelligent apps with machine learning capabilities including image recognition, object detection, text analysis, sentiment analysis, predictive analytics, recommendation engines, voice recognition, speech-to-text, conversational AI, and AI chatbots. Experience integrating OpenAI GPT models, Claude API, custom ML models, and on-device AI processing for privacy and performance. 2️⃣ 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 𝗠𝗼𝗯𝗶𝗹𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 - I build complete mobile solutions from concept to App Store deployment, including UI/UX design implementation, secure backend architecture, real-time data synchronization, WebSocket integration, push notifications, and performance optimization. 3️⃣ 𝗣𝗿𝗼𝘃𝗲𝗻 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 - I've delivered apps for healthcare (medical assessment tools, patient tracking, AI diagnostics, telemedicine), fintech (payment processing, secure transactions, fraud detection, cryptocurrency wallets), fitness & wellness (activity tracking, brain fitness, AI coaching, nutrition planning), e-commerce (shopping carts, inventory management, personalized recommendations, AR try-on), and enterprise solutions (CRM, project management, team collaboration). 4️⃣ 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 𝗦𝗽𝗲𝗰𝗶𝗮𝗹𝗶𝘀𝘁 - Expert in third-party API integration, AI/ML services (OpenAI, Anthropic Claude, Google AI, Hugging Face), payment gateways (Stripe, PayPal), push notifications (FCM, APNs), social media SDKs (Facebook, Twitter, Instagram), analytics platforms (Google Analytics, Mixpanel, Amplitude), crash reporting (Firebase Crashlytics, Sentry), and cloud services synchronization. 5️⃣ 𝗤𝘂𝗮𝗹𝗶𝘁𝘆 & 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗙𝗼𝗰𝘂𝘀𝗲𝗱 - I implement robust debugging processes, memory leak detection, app optimization for speed and battery efficiency, crash monitoring, A/B testing, user analytics, code review, and ongoing maintenance to ensure apps stay updated with the latest iOS/Android versions and AI capabilities. 𝗠𝘆 𝗔𝗽𝗽𝗿𝗼𝗮𝗰𝗵: I don't just write code - I deliver business solutions powered by cutting-edge technology. Every app I build focuses on scalability, security, user retention, and conversion optimization. I leverage AI and machine learning to create personalized, intelligent experiences that keep users engaged. I follow Apple Human Interface Guidelines and Material Design principles to create intuitive experiences users love. Whether you need a 𝗯𝗿𝗮𝗻𝗱 𝗻𝗲𝘄 𝗔𝗜-𝗽𝗼𝘄𝗲𝗿𝗲𝗱 𝗮𝗽𝗽 𝗳𝗿𝗼𝗺 𝘀𝗰𝗿𝗮𝘁𝗰𝗵, want to 𝗮𝗱𝗱 𝗺𝗮𝗰𝗵𝗶𝗻𝗲 𝗹𝗲𝗮𝗿𝗻𝗶𝗻𝗴 𝗳𝗲𝗮𝘁𝘂𝗿𝗲𝘀 to existing apps, need 𝗖𝗵𝗮𝘁𝗚𝗣𝗧/𝗟𝗟𝗠 𝗶𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻, require 𝗰𝗼𝗺𝗽𝘂𝘁𝗲𝗿 𝘃𝗶𝘀𝗶𝗼𝗻 or 𝗶𝗺𝗮𝗴𝗲 𝗽𝗿𝗼𝗰𝗲𝘀𝘀𝗶𝗻𝗴, want 𝗽𝗿𝗲𝗱𝗶𝗰𝘁𝗶𝘃𝗲 𝗮𝗻𝗮𝗹𝘆𝘁𝗶𝗰𝘀, need 𝗔𝗥/𝗩𝗥 𝗳𝗲𝗮𝘁𝘂𝗿𝗲𝘀, or require 𝗔𝗽𝗽 𝗦𝘁𝗼𝗿𝗲 𝘀𝘂𝗯𝗺𝗶𝘀𝘀𝗶𝗼𝗻 𝘀𝘂𝗽𝗽𝗼𝗿𝘁, I'm here to exceed expectations. 𝗥𝗲𝗮𝗱𝘆 𝘁𝗼 𝘁𝗿𝗮𝗻𝘀𝗳𝗼𝗿𝗺 𝘆𝗼𝘂𝗿 𝗺𝗼𝗯𝗶𝗹𝗲 𝗮𝗽𝗽 𝗶𝗱𝗲𝗮 𝗶𝗻𝘁𝗼 𝗮𝗻 𝗶𝗻𝘁𝗲𝗹𝗹𝗶𝗴𝗲𝗻𝘁, 𝗔𝗜-𝗽𝗼𝘄𝗲𝗿𝗲𝗱 𝗿𝗲𝗮𝗹𝗶𝘁𝘆? 📅 𝗕𝗼𝗼𝗸 𝗮 𝗽𝗮𝗶𝗱 𝗰𝗼𝗻𝘀𝘂𝗹𝘁𝗮𝘁𝗶𝗼𝗻 for specific technical advice and project scoping. 💬 𝗜𝗻𝘃𝗶𝘁𝗲 𝗺𝗲 𝘁𝗼 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 or send a message for a complimentary exploratory conversation.

🚀 Over 14 years and 320+ shipped products, we've helped startups and scaling businesses turn ideas into fast, profitable digital platforms. Our team has delivered 180+ custom web applications, 60+ mobile apps, and 40+ AI-powered software systems, each engineered to perform from day one and scale without friction. I lead a senior full stack developer team with deep roots in both frontend and backend engineering. We've driven results that speak for themselves: load times reduced by up to 73%, API response times cut from 1.8s to under 200ms, and clients growing revenue by 3-5× after launching platforms we built. Whether the project calls for a dedicated React developer, a WordPress developer, a mobile app developer, or a complete full stack developer team owning end-to-end delivery, we've executed at scale across every major industry. E-commerce and growth systems are core to what we do. Our full stack Shopify builds have processed $2M+ in Year 1 GMV. Custom React Shopify frontends we've engineered improved client conversion rates by 38%. Full stack ecommerce platforms we've shipped now serve 50,000+ daily active users. Full stack SEO is baked into our engineering process from day one, server-side rendering via React Next.js, structured data, Core Web Vitals optimization, helping clients rank on Page 1 for 400+ competitive keywords within 6 months of launch. SEO React architecture isn't an afterthought in our workflow; it's a first-class engineering requirement built into every frontend system we deliver. Our React developers architect scalable component libraries used across teams of 15+ engineers and consistently deliver UI scoring 90+ on Lighthouse performance audits. On mobile, we've shipped 60+ cross-platform React Native mobile applications with 800,000+ combined downloads and an average 4.7★ app store rating. Every React Native developer on our team works across the full product lifecycle, architecture, development, App Store submission, and post-launch iteration, using React Native Expo for fast, reliable iOS and Android deployment. Our WordPress developer practice has produced 90+ websites, from editorial platforms handling 500,000+ monthly visitors to WooCommerce stores carrying 10,000+ SKUs. Every website that leaves our team is performance-tuned, SEO-ready, and built so non-technical editors can manage it without touching a line of code. The full stack developer team I lead operates across the entire technology stack. On the frontend: React, React TypeScript, React Next.js, Vue.js, Webflow, Tailwind CSS, and Bootstrap. On the backend: Python, FastAPI, Django, Node.js, Laravel, PHP, REST APIs, and GraphQL. Our Python developer capability covers data pipelines processing 2M+ records daily and backend APIs handling 100,000+ requests per hour. Infrastructure runs on AWS, Firebase, and Supabase, with CI/CD pipelines that compress deployment time to under 8 minutes. We've delivered software across 15+ verticals including AI platforms, fintech, healthcare, legal document automation, education LMS, HR software, social media products, automotive ERPs, manufacturing systems, and digital marketing platforms with Meta, Google, and TikTok integrations. Our AI-powered platforms have reduced client manual review time by 65%, improved lead qualification accuracy by 44%, and automated 1,200+ repetitive operational tasks per month. The engagement model flexes to fit what you actually need. A solo React developer who owns frontend delivery end-to-end and ships a complete system in 6 weeks. A senior web developer who steps into an existing codebase, stabilizes releases, and reduces critical bug rates by 80% within 90 days, something we've done for 25+ companies. A full stack developer team scaling from 2 to 14 engineers mid-project without missing a single deadline. We've operated in every configuration and delivered in all of them. Whatever the scope - a new website, a SaaS product, a scalable React frontend, a CMS platform, cross-platform mobile apps, or a complete backend system, my team has the full stack developer depth, the React developer precision, the web developer range, and the product engineering experience to build it right the first time. 14 years. 320+ products. Millions of users served. Let's build yours.

📱 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 · 𝟭𝟬𝟬% 𝗝𝗦𝗦 · 𝟳𝟬+ 𝗮𝗽𝗽𝘀 · 𝟱 𝘆𝗿𝘀 · 𝗹𝗶𝗳𝗲𝘁𝗶𝗺𝗲 𝘄𝗮𝗿𝗿𝗮𝗻𝘁𝘆 𝗼𝗻 𝗲𝘃𝗲𝗿𝘆 𝗮𝗽𝗽 𝗜 𝗱𝗲𝗹𝗶𝘃𝗲𝗿 Clients come to me when the app needs to work - not just launch. Whatever it takes: complex state management, real-time sync, API integration, HIPAA flows, wearables, in-app purchases, AI features. I've shipped all of it. Every line still mine to support. 👉 𝗖𝗹𝗶𝗰𝗸 𝗛𝗶𝗿𝗲 𝗼𝗿 𝗜𝗻𝘃𝗶𝘁𝗲 to work with a React Native Developer and iOS Developer who owns the product, not just the sprint. 🎯 𝗪𝗛𝗔𝗧 𝗬𝗢𝗨 𝗚𝗘𝗧 ✔️ As a React Native Developer and iOS Developer with 70+ shipped apps - complex state, real-time sync, third-party APIs, HIPAA-sensitive data flows, wearable integration. Not a prototype - a product that holds in production. ✔️ As a Mobile App Development React Native specialist - one TypeScript codebase, iOS and Android, App Store and Play Market. Firebase, Redux, push notifications, subscriptions. 40–60% faster launch than split native teams. ✔️ As a Mobile App Developer and React Native Developer for long builds - 6–18 months, mobile app redesign, scaling live codebases. 100% client retention across 5 years. ✔️ As a full stack developer react native - Node.js, REST APIs, Firebase, end-to-end mobile app development. 🔥 𝗔𝗖𝗛𝗜𝗘𝗩𝗘𝗠𝗘𝗡𝗧𝗦 ✔️ 5 years · 70+ apps as a React Native Developer and Mobile App Developer - Healthcare, Wellness, Fitness · US, EU, global. ✔️ 30–45% better retention across 15+ Mobile App Development React Native builds - wearable sync, HIPAA-compliant. ✔️ 40–60% faster time-to-market as a Mobile App Developer and iOS Developer vs split native teams - one codebase, full parity. ✔️ 2x faster onboarding as a Mobile App Developer - smart flows, push notifications, subscription logic. ✔️ 100% satisfaction · Mobile App Developer lifetime code warranty across every engagement. 🚀 𝗪𝗛𝗘𝗥𝗘 𝗜 𝗗𝗘𝗟𝗜𝗩𝗘𝗥 ✔️ Patient engagement, wearable & sensor sync, HIPAA-sensitive data - as a React Native Developer this is core territory. 15+ Healthcare Mobile App Development React Native products shipped. ✔️ Fitness booking, real-time workout sync, athlete health tracking - as a Mobile App Developer and iOS Developer for sports and wellness, apps users open daily. ✔️ Corporate wellness - Mobile App Development React Native: react native expo, react native developer expo, react native tailwind UI, multi-role, subscription-driven, production-grade. ✔️ AI wardrobe, lifestyle, and consumer products - react native app developer work across react native mobile, react native engineer, mobile application developer builds where UX drives retention. ✔️ E-Commerce and shopify mobile app builds - mobile app design, mobile app development as a Mobile App Developer delivering Mobile App Development React Native with 20–30% better conversion. 🏆 𝗜𝗡𝗗𝗨𝗦𝗧𝗥𝗬 𝗩𝗘𝗥𝗧𝗜𝗖𝗔𝗟𝗦 ✔️ Healthcare & Clinical - React Native Developer and iOS Developer: HIPAA patient platforms, wearable sync, clinical-grade UX. 30–45% adherence. ✔️ Fitness & Sports - Mobile App Developer and iOS Developer: real-time sync, booking, Strava API. 2x onboarding. ✔️ Corporate Wellness - Mobile App Developer: Mobile App Development React Native for EU-market B2B, multi-role. 25–35% engagement. ✔️ AI & Lifestyle - React Native Developer: AI wardrobe, bubble-style UX, react native mobile consumer products. ✔️ E-Commerce & Shopify - Mobile App Developer: shopify mobile app, mobile app design, Mobile App Development React Native that converts. ⚒️ 𝗛𝗢𝗪 𝗜 𝗕𝗨𝗜𝗟𝗗 ✔️ 70+ apps as a React Native Developer: React Native, React, JavaScript, TypeScript, Redux, Firebase, Node.js, REST APIs, react native expo, react native tailwind - full Mobile App Development React Native stack. ✔️ Native layer as an iOS Developer and Android specialist: iOS Development (Swift, HealthKit, App Store), Android App Development (Kotlin, Google Fit, Play Market), Smartphone, Native App Development. ✔️ UI layer: HTML, HTML5, CSS, CSS3, CSS 3, Responsive Design, Mobile App Design, Web Design - react developer and web developer-aware patterns. ✔️ Backend & data as a full stack developer react native: Node.js, MongoDB, SQL, PHP, Python, Laravel, WordPress, Vue.js, Angular, Java, Git, Software Architecture & Design, Software Development, Debugging. ✔️ Ecosystem: Flutter, flutter developer App Development, Mobile App Redesign, Desktop Application, Shopify, Web Development, python developer tools, business analyst-grade ownership. 🔹 Lifetime warranty - every bug on my side fixed, no questions asked, for as long as your app is live. 🔹 Full ownership as an iOS Developer and React Native Developer - architecture, build, App Store & Play Market. 🔹 React Native Developer · iOS Developer · Mobile App Developer · Mobile App Development React Native · 70+ apps · 100% JSS. Building a mobile product on React Native? Message me 💬

Hi 👋 I’m Konstantin, COO at Lember. For more than 10 years, I’ve worked with startups and established companies across North America and Europe. During that time, I’ve been involved in software delivery, team growth, and long-term client partnerships across a wide range of technology initiatives. At Lember, we work across AI development, AI integration, software development, SaaS development, full-stack development, web development, technical consulting, and web app audits. A large part of my work involves helping clients evaluate technical direction, plan development efforts, expand engineering capacity, and navigate complex delivery challenges. 🖥️ WHAT WE WORK ON: ☑️ Web applications, internal tools, and custom software ☑️ SaaS platforms, both new and existing ☑️ Marketplaces, booking and service platforms ☑️ Customer portals and admin panels with analytics ☑️ MVPs and prototypes for early-stage products and fundraising ☑️ AI integrations into products and workflows (RAG, MCP, AI agents) ☑️ Integrations between systems, APIs and third-party tools ☑️ Payment, billing and subscription systems ☑️ Cloud infrastructure and deployment ☑️ Improving, stabilizing and completing systems already in use 🚀 AREAS WE COVER: ☑️ Custom software development and full-stack development ☑️ SaaS development and SaaS product modernization ☑️ Legacy system modernization and system rework ☑️ Cloud migration and cloud infrastructure (AWS, GCP, Microsoft Azure) ☑️ AI integration into products and systems ☑️ Staff augmentation and dedicated engineering support 🤖 AI WE WORK ON: ☑️ AI assistants and chatbots for products and internal tools ☑️ Connecting AI to internal data and documents (RAG) ☑️ Workflow automation and decision support ☑️ AI integration into systems already in use 🛠️ TECHNOLOGIES WE WORK WITH: ☑️ Frontend: React, Next.js, Angular, Vue.js ☑️ Backend: Node.js (NestJS, Express), .NET (C# / ASP.NET), PHP (Laravel, Symfony) ☑️ APIs and integrations: REST, GraphQL ☑️ Databases: PostgreSQL, MySQL, MongoDB ☑️ Cloud: AWS, Microsoft Azure, Google Cloud Some of our clients have been with us for over 8 years and some of our engineers have been with us from the beginning. We take that trust seriously and work to earn it on every project. If you’re starting a new product or working with an existing system that’s no longer keeping pace, send a short overview and we’ll take a look and go through it with you 📨

🏆 Top 3% of Freelancers - Top Rated Plus 💎 10+ Years as Node.js Developer, Backend Developer, Full Stack Developer, Web Developer ⭐ Can do anything with Node.js, React, Next.js, MERN, JavaScript, TypeScript, ExpressJS, MongoDB, Python, Vue.js, React Native, RESTful API & AI integration "Anna is an exceptional developer! Our project flourished under her expertise. She's detail-oriented, creative, and a pleasure to work with. Communication was seamless, making the collaboration effortless. We highly endorse Anna and eagerly anticipate future collaborations." - Max A., NDA Hi! I'm Anna, a senior Node.js developer and backend developer with 10+ years building scalable web applications, SaaS platforms, RESTful APIs, and enterprise systems. Whether you need a dedicated Node.js developer, a node.js backend developer, or a full stack developer who owns the entire product - I deliver production-ready solutions built to scale. As a back end developer Node.js and full stack web developer, I work across the complete stack: from database architecture to pixel-perfect UI. My core stack: Node.js · ExpressJS · React · Next.js · TypeScript · JavaScript · MongoDB · MySQL · PostgreSQL · Vue.js · React Native · Python · PHP · WordPress · HTML · CSS 3 · Supabase · GraphQL · AWS · Docker 🔹 What I Do Best as Node.js Backend Developer As a Node.js developer and backend developer with enterprise-level experience, I specialize in: ✅ Back-End Development & Backend NodeJS Architecture - Scalable Node.js services, microservices, and backend nodejs systems built with ExpressJS, REST, and GraphQL. As a node.js backend developer, I design APIs that are fast, secure, and cloud-ready. Python backend and supabase backend integrations included. ✅ Full-Stack Development & Software Development - End-to-end web development as a full stack developer: React / Next.js frontends powered by robust Node.js backends. Full stack nodejs, react node.js, vue.js node.js, and node.js next.js delivery. Also available as a python full stack developer for AI-heavy projects. ✅ AI Integration & AI Model Integration - Embedding AI integration and AI model integration into Node.js, Python, and React applications. Full stack developer AI workflows, including LLM-powered features, intelligent automation, and app developer with AI capabilities. ✅ RESTful API Design & API Integration - As a backend engineer and back end developer Node.js, I build and integrate RESTful APIs, GraphQL endpoints, and third-party services. Experienced with Supabase, Airtable, and postgresql supabase javascript rest json pipelines. ✅ MVP & SaaS Development - From MVP app development to production SaaS: full stack developer SaaS platforms, no code MVP consultation, mobile app MVP, and scalable multi-tenant architecture as a fullstack developer node.js. ✅ Mobile & Front-End Development - React Native mobile apps, Vue.js node interfaces, react nextjs dashboards, and HTML/CSS 3 UIs. React developer with node.js experience across web and mobile. Also: react native mobile, front end developer react, html website developer. ✅ DevOps, Cloud & Security - AWS, Docker deployments; database design with MongoDB, MySQL, PostgreSQL, Supabase. Performance optimization and security hardening for every backend nodejs system I deliver. ✅ QA & Testing - QA development is built into every project. I write tests, perform code reviews, and validate backend nodejs services and React frontends before delivery - so you ship with confidence, not crossed fingers. 💡 Projects I'm Proud Of 🔹 SaaS Platform - As lead Node.js developer and node.js backend developer, built a MERN-based platform with subscription billing, multi-tenant architecture, and cloud pipelines. Increased user engagement by 40% and contributed to $1.2M+ ARR growth after launch. 🔹 E-commerce System - Delivered checkout flows as a full stack developer using React and Node.js APIs. Integrated payments, analytics, inventory sync, and fulfillment services. Boosted conversion rates by 25% and increased monthly revenue by $480K through frontend optimization. 🔹 Enterprise Dashboard with Admin Panel - As a node.js backend developer and react developer, built real-time dashboards with Next.js, GraphQL, and Node.js. Improved system throughput by 50% and reduced operational processing costs by 32%. 🚀 Why Work With Me? ✔ 300+ projects as a Node.js developer, backend nodejs engineer, and full stack developer ✔ 150+ satisfied clients across E-commerce · SaaS · FinTech · EdTech · Healthcare · Real Estate · Logistics · Startups ✔ Long-term partner from MVP to enterprise - I'm the Node.js developer and full stack developer who stays, scales, and delivers 📩 Need a Node.js developer, backend developer, or full stack developer for a custom solution? Invite me to the job or send a direct message and let's build something great. 📆 Last Updated: 7/1/26

I help businesses turn complex ideas into fast, scalable web applications and AI-powered products. My main stack revolves around JavaScript / TypeScript ecosystems, modern frontend frameworks, and reliable backend architecture designed for real production environments. I have 7 years of experience in full-stack engineering. Over the past years, I’ve worked on SaaS platforms, enterprise tools, and high-traffic web systems, building features from concept all the way to deployment. 🔹 Full-Stack Development I build complete web systems using React, Next.js, and Angular on the frontend, combined with Node.js and TypeScript on the backend. My goal is always the same: clean architecture, maintainable code, and systems that continue to scale as products grow. 🔹 AI Integration I also develop AI-driven features such as automated reporting, intelligent assistants, data transformation tools, and AI workflows using modern LLM and OpenAI integrations. These solutions help automate processes and turn unstructured data into useful insights. 🔹 Backend & Data Architecture On the server side I work with Node.js, GraphQL, REST APIs, and modular backend systems. For data storage I design scalable models using PostgreSQL, MySQL, and MongoDB, ensuring reliability, performance, and efficient data handling. 🔹 Infrastructure & Modern Development I deploy and maintain systems using Docker, AWS, CI/CD pipelines, and structured Git workflows, ensuring stable production environments and smooth team collaboration. 🤝 How I Work I collaborate closely with founders, product teams, and designers to turn ideas into working software. Clear communication, transparent progress updates, and scalable technical decisions are core parts of my development process. 🚀 Why Work With Me I focus on building reliable, scalable systems that support real business growth, combining full-stack engineering with modern AI capabilities to create products that are both powerful and future-ready

Skilled 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 Engineer. I work mainly with Microsoft tools. Create strong, growing, and fast web applications using 𝐂# and .𝐍𝐄𝐓, along with modern ways to build the front end, like 𝐀𝐧𝐠𝐮𝐥𝐚𝐫 and 𝐑𝐞𝐚𝐜𝐭. I know all parts of making an application, from how the data is stored and how it's shared, to making good-looking and easy-to-use interfaces. 𝐈 𝐡𝐚𝐯𝐞 𝐰𝐨𝐫𝐤𝐞𝐝 𝐰𝐢𝐭𝐡 𝐯𝐚𝐫𝐢𝐨𝐮𝐬 𝐟𝐢𝐞𝐥𝐝𝐬, 𝐢𝐧𝐜𝐥𝐮𝐝𝐢𝐧𝐠: 🛒 𝐄-𝐜𝐨𝐦𝐦𝐞𝐫𝐜𝐞: I have made and improved online shops. This includes connecting payment systems (like Stripe, PayPal), making shopping carts work, and managing what is in stock. I have made these shops work better, so more people buy things. (Example: Increased average order value by 15% through personalized product recommendations.) 💳 𝐅𝐢𝐧𝐭𝐞𝐜𝐡: I have built safe money applications, like online banks, payment systems, and ways to see financial data. I made sure these followed the rules and were very secure. 🏥 𝐇𝐞𝐚𝐥𝐭𝐡𝐜𝐚𝐫𝐞: I have created applications that follow health rules for managing patients, booking appointments, and keeping health records. I focused on making these easy to use and keeping the data safe. 🚚 𝐋𝐨𝐠𝐢𝐬𝐭𝐢𝐜𝐬: I have designed applications for planning the best routes, tracking where things are, and managing how goods are moved. This has made deliveries much more efficient. (Example: Reduced delivery times by 20% with optimized routing algorithms.) In addition, I have built and looked after many 𝐒𝐚𝐚𝐒 applications using .NET. 🛠️ 𝐓𝐡𝐚𝐭’𝐬 𝐰𝐡𝐚𝐭 𝐈’𝐦 𝐬𝐤𝐢𝐥𝐥𝐞𝐝 𝐢𝐧: 𝐁𝐚𝐜𝐤𝐞𝐧𝐝: C#, .NET Framework, .NET Core, ASP.NET (MVC, Web API), Entity Framework, SQL Server, RESTful API design and development, Web API, gRPC, Dependency Injection, LINQ, ORM 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: JavaScript, TypeScript, Angular, React, HTML5, CSS3, State Management (Redux, NgRx), UI/UX Design, Responsive Design, SPA 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞: SQL, NoSQL, Database Design, Stored Procedures, Optimization 𝐂𝐥𝐨𝐮𝐝: Azure, AWS, Docker, Kubernetes 𝐎𝐭𝐡𝐞𝐫: Git, Agile, CI/CD, Unit Testing, Microservices Architecture, WebSocket 𝐋𝐞𝐭'𝐬 𝐭𝐚𝐥𝐤 about what you need and how my skills can help you succeed. Please contact me to discuss your project! 𝐁𝐞𝐬𝐭 𝐰𝐢𝐬𝐡𝐞𝐬, 𝐎𝐫𝐞𝐬𝐭 Below are mentioned keywords so you could find me easier :) .NET Core, .NET Framework, .NET Web API, .NET to Laravel migration projects, AI App Development, AI design tools, API, API Development, API Integration, API microservices, ASP.NET, ASP.NET 4.8 Web Forms, ASP.NET Core, ASP.NET MVC, ASP.NET Web API, Angular, Angular 15+, AngularJS, Auth0, Blazor, Bootstrap, Bruno, C#, C++, CSS, CSS3, Database Design, Database Development, Database Optimization, Desktop Application, Docker, Domain-Driven Design, Entity Framework, Excellent communication and collaboration abilities, Figma, Sketch, or similar, Front-End Development, Full-Stack Development, GDPR, Google Calendar API, GraphQL, HTML, HTML5, JSON, Java, JavaScript, Microservice, Microsoft Azure, Microsoft IIS, Microsoft SQL Server, Microsoft SQL Server Programming, Microsoft Visual Studio, MongoDB, MySQL, Network programming, Node.js, Nuxt.js, PHP, PostgreSQL, Proven track record of large-scale platform redesign projects, Python, QWBC, QuickBooks Enterprise, RESTful API, React, React Native, Responsive Design, Salesforce App Development, Salesforce Lightning, SEO optimization, Software Architecture & Design, SQL, Strong analytical and problem-solving skills, Telerik, TypeScript, UX & UI, User Interface Design, VB.NET, Web Application, Web Design, Web Development, Web development principles, Windows App Development, XML, Adobe Photoshop, Amazon EC2, Amazon Web Services, Azure DevOps, jQuery, backend.

✔ IoT Solution Leader | Leading a team of 220+ engineers ✔ 11+ Years in connected products | End-to-end IoT development ✔ Hardware + Firmware + Cloud Expertise Drop me a message with “DISCOVERY” - we’ll run a free discovery session and turn your idea into a clear architecture, timeline, and execution roadmap while avoiding costly mistakes early on. I lead a 220+ engineer team specializing in end-to-end IoT development – from early discovery and architecture to prototyping, production preparation, and long-term product evolution. Over the last 11+ years, I’ve been involved in building connected solutions that combine embedded systems, electronics, firmware, cloud platforms, and user apps (web, mobile, desktop). My role is focused on bridging business goals with engineering reality: helping teams validate ideas, select the right architecture, reduce technical risks, and build products that can successfully move from prototype to production. Core expertise: • IoT system architecture Designing complete connected ecosystems: devices, communication layers, cloud infrastructure, data flows, APIs, and user applications. • Embedded systems & firmware MCU/MPU-based development, RTOS, embedded Linux, device drivers, hardware communication protocols, low-power optimization, OTA updates. • Hardware development & prototyping Electronics design, schematics, PCB development, hardware bring-up, testing, validation, and preparation for mass production. • Connectivity & communication BLE, Wi-Fi, LoRaWAN, LTE/cellular, MQTT, sensor integration, and reliable device-to-cloud communication. • IoT cloud platforms AWS IoT, device management, telemetry pipelines, real-time monitoring, analytics, and scalable backend architectures. • Connected applications Web dashboards, mobile apps, desktop applications, admin portals, device management platforms, and third-party integrations. Typical IoT products I work with: • Industrial IoT & Industry 4.0 Connected machinery, predictive maintenance, industrial automation, sensor networks, and remote monitoring. • Smart Home & Building Automation Connected devices, automation platforms, energy management, and intelligent control systems. • Healthcare & Wearables Connected medical devices, monitoring solutions, wearable ecosystems, and compliance-focused development. • Energy & Infrastructure Smart metering, energy monitoring, telemetry systems, and remote control solutions. • Location-based products GPS tracking, asset tracking, fleet monitoring, and safety-focused connected devices. • Robotics & Drones UAV/UGV/UAS platforms, telemetry, control systems, and autonomous solutions. Selected project experience: • GPS tracking ecosystem Built a connected solution combining hardware devices, firmware, cloud infrastructure, mobile applications, and management dashboards for real-time tracking and alerts. • Wearable safety platform Developed an IoT wearable ecosystem with embedded software, wireless connectivity, cloud services, and user-facing applications. • Industrial monitoring solution Created a sensor-based platform for collecting operational data, processing telemetry, and providing actionable insights through dashboards. Why clients work with me: • Strong industrial and commercial product development experience I work with complex products where reliability, scalability, security, and real-world constraints matter. • Ability to handle both hardware and software challenges IoT success depends on how all system components work together - not isolated development tasks. • Clear communication and structured development process Transparent milestones, technical documentation, predictable execution, and clear ownership at every stage. • Focus on practical solutions I help teams avoid unnecessary complexity and choose architectures that fit actual product goals. • Long-term support mindset Project scope for reference: Phase 01 – Definition & Architecture: $15k–$25k Discovery, requirements analysis, system architecture, technology selection, and roadmap creation. Phase 02 – Prototype & Validation: $35k–$120k Hardware prototypes, firmware, cloud infrastructure, applications, testing, and product validation. Phase 03 – Production Readiness: $60k–$250k+ Production optimization, manufacturing support, certification preparation, scalability improvements, and deployment. My approach: I don’t start with coding. I start by understanding the product vision, business goals, technical constraints, and future scaling requirements. The goal is to create IoT systems that work reliably in real-world conditions, avoid expensive redesigns, and provide a strong foundation for future growth. If you’re building a connected product involving hardware, firmware, cloud, or device management - feel free to share your idea. I'm ready to help evaluate the technical approach and identify the most practical path forward. Worth a chat?

🧩🌍7 years as a Shopify developer expert, certified by Shopify - building everything from standard or custom Shopify stores to public Shopify apps and Shopify headless storefronts, and there's always a way to make it work. My Shopify web developer achievements: - launched 79 Shopify websites for fashion, lifestyle, supplement, entertainment brands - they earn around $155M+ yearly based on my work. As a Shopify developer, I built 35+ themes with expertise converting Figma and HTML website design to Shopify. Every project focuses on and includes comprehensive Shopify SEO, conversion rate optimisation shopify, and Klaviyo integrations to maximize growth. - as a Shopify app developer skilled in Shopify app development, built 46 Shopify public apps for the Shopify app store and 20 Shopify custom apps for internal customer needs, for example a custom configurator app. I am a Shopify app developer who delivered 30+ apps with a "Built for Shopify" badge. Ready to be the React developer for your next Shopify public app or Shopify custom app. - 55 Shopify theme customization projects for Shopify 2.0 themes using Liquid, HTML, CSS, and JavaScript. As a full stack developer, I heavily focus on improving design and Shopify speed with a proven ability to customize a modern OS 2.0 theme using Liquid developer skills for your Shopify store. - assisted 46 clients in boosting sales via conversion rate optimization and mobile-first approach. As a Shopify developer, I eliminate bugs and gaps holding your Shopify website or Shopify store back. As a web developer I provide design refinement + implementation to seamlessly optimize both desktop and mobile UX for growth, with affiliate marketing apps integrations for better UX. - 30 migrations made: Woocommerce to Shopify migration; Shopware to Shopify migration; Magento to Shopify migration or other CMS to Shopify migration. I’ve handled collections, customer, order and other data migrations with protecting existing Shopify SEO rankings which is always critical for Shopify management. As your Shopify developer expert, I always ensure the transition is invisible to your customers but transformative for your workflow. - with more than 100 Shopify development and Shopify app development audits under my belt, where I specialize in turning underperforming stores around to boost Shopify speed and Core Web Vitals metrics, I delivered $10M+ in incremental revenue across my last 20 client engagements. I always achieve improvements for my clients through enhancing Shopify SEO, applying strong Liquid, HTML, CSS, and JavaScript skills to clean the code and avoid relying on third-party apps that slow down site speed. My Shopify developer skills: 🟢 Shopify developer seo marketing, shopify va - I set up shopify site for beauty and fashion, luxury, wellness, supplement, jewelry, lifestyle, other brands 🟢 Shopify OS 2.0 theme customization beyond template limitations - huge experience with themes like Dawn, Impulse, Focal, Impact, Be Yours and 35 more 🟢 Shopify app developer - strong understanding of JavaScript, React Router v7, TypeScript, Prisma, Polaris, Remix.js, Python shopify 🟢 Shopify developer building custom headless storefronts using Hydrogen and Oxygen with seamless headless CMS integration. 🟢 Shopify developer CRO & Shopify designer specializing in landing page builder solutions to accelerate growth for e-commerce using GemPages / Replo. 🟢 Shopify app development with focus on Shopify Admin API, Shopify API integration, webhooks (HMAC verification, idempotency), OAuth install flow experience as well as Theme App Extensions / App Embed Blocks 🟢 Translating Figma, HTML or Adobe PSD designs into a polished, high-converting Shopify store and storefronts 🟢 Shopify Plus development, with significant checkout customization for B2B companies and brands 🟢 Shopify Plus developer - custom Shopify app development, Shopify Functions, Shopify customer account extensibility and API integration experience 🟢 Deep experience in theme customizations using Liquid, HTML, CSS, and JavaScript skills 🟢 Custom theme development and Shopify UX improvements based on Figma designs 🟢 Homepage, Product Page, supporting pages optimization and refinement for better Shopify marketing - theme customization as well - not an industrial designer 🟢 Shopify website configuration expert - subscription management, Klaviyo email marketing, Judge.me, Loox review apps, Shopify dropshipping setup, payment integration and checkout, quiz apps (Octane AI, Shop Quiz), Google Analytics 4, Meta Pixel & Conversion API, inventory management, kajabi. Shopify developer, Shopify web development, Shopify developer cro for 10x boost, speed optimization, Shopify SEO, checkout customization, and Shopify 2.0 sections and blocks. With Wordpress shopify developer background, I handle end-to-end Shopify migrations including WooCommerce to Shopify migration (not fintech / odoo) Please DM me or send an invite to proceed!

Hey, happy to meet you on my profile! 😊 My name is Irina, and I’m proud to be a part of PettersonApps - a fast-growing software development company with over 10 years of experience delivering web, mobile, OTT, and custom digital solutions for clients worldwide. Over the years, we’ve partnered with startups, scale-ups, and enterprise companies across different industries, helping them build, improve, and scale their products with reliable development teams and transparent communication. Today, our team includes 150+ specialists covering the full product development cycle - from discovery and UI/UX design to development, QA, release, and ongoing support. Our expertise includes: ✅ Mobile app development (iOS, Android, Flutter, React Native) ✅ Web development (React, Next.js, Node.js, PHP, etc.) ✅ OTT platforms (Roku, tvOS, Android TV, Apple TV) ✅ AI/ML-powered solutions ✅ Unity development (AR/VR experiences & games) ✅ UI/UX design ✅ QA & testing support ✅ Dedicated project management and delivery support Whether you need support at a specific development stage or a full cross-functional team to take care of your project end-to-end, we’d be glad to help. I always aim to build long-term, transparent partnerships and make the collaboration process smooth and comfortable for clients. Feel free to reach out. I’d love to discuss your requests/requirements and answer any questions 📩