Hire the Best React.js Developers in New York

A good web application must do more than look polished. It should load quickly, handle data correctly, remain stable as features are added, and stay understandable for anyone working on the code later. For the past 5+ years, I have built and maintained full-stack web applications using JavaScript, React, Next.js, Node.js, Express.js, MongoDB, MySQL, and Three.js. I work across the complete development cycle, from planning application structure and database flow to building front-end interfaces, developing APIs, creating interactive 3D web experiences, testing features, and preparing applications for deployment. 𝐌𝐲 𝐜𝐨𝐫𝐞 𝐞𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 𝐢𝐧𝐜𝐥𝐮𝐝𝐞𝐬: ▪️ Full-stack JavaScript development ▪️ React and Next.js front-end development ▪️ Node.js and Express.js back-end development ▪️ MERN stack web applications ▪️ Three.js and interactive 3D web development ▪️ WebGL-based 3D experiences and animations ▪️ 3D product visualization for websites ▪️ MongoDB and MySQL database integration ▪️ REST API development and third-party API integration ▪️ User authentication and role-based access ▪️ Responsive dashboards, portals, and web applications ▪️ Feature development for existing applications ▪️ Bug fixing, code refactoring, and performance optimization ▪️ Git-based version control I can also integrate Three.js into React and Next.js applications to create interactive 3D sections, product showcases, animated website experiences, 3D landing pages, and custom WebGL-based interfaces while keeping performance and responsiveness in mind. Before development begins, I review the required features, data flow, user roles, technical requirements, and possible edge cases. For Three.js projects, I also consider model complexity, animation requirements, browser performance, loading speed, and mobile responsiveness before implementation. Depending on the project, I can deliver a complete full-stack web application, build an individual front-end or back-end component, develop an interactive Three.js experience, integrate APIs, create database structures, or improve an existing React, Next.js, Node.js, MERN, or Three.js application. You will receive readable code, an organized project structure, tested functionality, setup documentation, and regular progress updates throughout development. If you are building a new web application, an interactive 3D website, a Three.js product experience, or improving an existing JavaScript application, send me your project scope, designs, 3D assets, or repository overview. I will review the technical requirements and outline the most practical next steps for development.

✅ Hi there! I'm Don Russell, a full-stack wordpress and shopify developer based in Westchester, New York. With more than 12 years of experience in WordPress, Shopify, WooCommerce, and React JS, I am helping businesses to create user friendly and high performing websites that drive conversions. I don't just build websites, I help build solutions that work for your businesses. Whether it is a custom theme, a plugin, a Shopify store, or a fully optimized web app, I have you covered. Let’s dive into what I can do for you: I am experienced in following languages & Tools: ✓ HTML, CSS, JavaScript, Core PHP ✓ React JS, Node JS, Liquid Shopify ✓ Git, GitHub, Bitbucket ✓ jQuery, Bootstrap, Tailwind, Ajax ✅ WordPress: I'm experienced in delivering customized WordPress solutions that cater to your specific needs. From custom themes and plugin development to advanced website building with tools like Elementor Pro, Divi, Oxygen Builder, and Gutenberg. I guarantee your site will be functional and visually stunning. Whether it’s WooCommerce customization like cart, checkout, shipping methods, ensuring your site is virus free, SSL setup, and site security enhancements, I got you covered. I’m also experienced in seamless API integrations, including WordPress REST API and third-party tools, to extend your site’s functionality. If you have designs in Figma, PSD, or XD, I can transform them into fully responsive and dynamic custom WordPress themes that align perfectly with your vision. ✅ Shopify: I also have years of experience in developing and customizing online storefronts for Shopify development, creating seamless eCommerce experiences tailored to your brand. From building custom Shopify 2.0 themes all the way to advanced theme customization using Liquid code. I can ensure your store is optimized for performance and functionality. Whether you need app integrations like loyalty programs or subscription products, or API setups for CRM tools such as HubSpot and MailChimp, I can handle it all. Checkout extensibility and designing custom sections at the storefront level are among my specialties, which further improve user experience and sales. ✅ React+Node.js: As a React and Node.js developer, I craft interactive web applications with a focus on UI/UX design that engages users and delivers results. I excel in API development and integration, ensuring seamless communication between systems, and optimizing performance through database integration and cutting-edge techniques. Let’s build solutions that are scalable, efficient, and tailored to your business needs! ✅ Website Migration: In order to ensure your website is moved smoothly and safely, I offer a complete website migration service. Whether it's moving one server to another, local test server to a live site environment or some other combination, my process prevents any loss in operating time that might happen during migration. Using manually managed migrations techniques means that I take care to ensure that every single detail is moved over. This covers files and databases relevant to your website, system configuration files including those for the various systems dependencies. If you need a website migrated, I'm your guy!  ✅ Other Services: ✓ Database optimization, malware scans, plugin updates ✓ Email and hosting setup, domain configuration, DKIM/SPF records, backups ✓ ADA compliance and SEO implementation ✅ Why Work With Me? When you choose to work with me, you’re not just hiring a developer — you’re partnering with a Top-Rated Plus Developer on Upwork with a 100% job success score. With over 11 years of experience, I specialize in delivering responsive, secure, and error-free websites that meet your business needs. I’m available Monday–Friday, 9am–5pm EST, ensuring clear communication and timely project updates. Plus, I don’t stop at project delivery—I offer ongoing support to keep your website running smoothly long after completion. Let’s collaborate to bring your vision to life! I know how critical it is to capture attention online. A poorly designed or slow website can cost you leads and sales. Let me help you create a website that stands out and gets results. Let’s jump on a call to discuss your project goals—whether it's a big project or a small task, I’m here to help. I'm looking forward to working with you! Best regards, Don Russell Shopify & WordPress Engineer

Building successful software isn't just about writing code—it's about solving business problems with the right technology. I'm a Senior JavaScript Developer with 8+ years of experience helping startups, founders, and growing businesses build scalable web and mobile applications using React, React Native, Next.js, Node.js, and TypeScript. Whether you're launching an MVP, modernising an existing product, scaling your platform, or extending your engineering team, I focus on delivering clean, maintainable solutions that are ready for production. My expertise includes: • React & Next.js applications • React Native (iOS & Android) • Node.js backend development & REST APIs • SaaS platforms & MVP development • Third-party API integrations • Authentication, payments & real-time features • Performance optimisation & bug fixing • Cloud services including AWS, Firebase and Supabase As AI becomes part of modern software, I also help businesses integrate practical AI features into their existing products using OpenAI, Claude, Gemini, RAG, MCP, and intelligent automation—always with a focus on real business value rather than unnecessary complexity. I believe good software should be easy to maintain, scalable as your business grows, and enjoyable for users. That's why I write clean code, communicate clearly, and treat every project as a long-term product rather than a short-term task. If you're looking for a JavaScript developer who can take ownership, contribute ideas, and build reliable web or mobile applications, I'd be happy to discuss your project.

I build clean, production React and Next.js apps, full stack, from Figma to deploy, and I don't disappear mid-project. Full Stack Developer with 4+ years across agencies and in-house teams, currently expanding into AI-integrated features. I build for real delivery, not just polished demos. 🔵 4+ years professional frontend & full-stack experience 🔵 5 completed certifications, including Meta and Google 🔵 Worked across 3 companies, from WordPress agencies to full-stack SaaS teams 🔵 Actively building AI integration skills on top of a solid full-stack foundation ⚡ Core: Frontend & Full Stack • React, Next.js, Angular, Vite, Vue.js, TypeScript, JavaScript (ES6+) • Node.js, Express.js, REST APIs • MongoDB, PostgreSQL, Supabase, Firebase • Tailwind CSS, Redux Toolkit, responsive UI • Figma-to-React, pixel-perfect implementation • SaaS dashboards, admin panels, multi-role platforms ⚡ Growing into: AI Integration • OpenAI API, Claude API, function calling, tool use • Completed Google Cloud's Generative AI Learning Path • Completed Microsoft/LinkedIn's Career Essentials in Generative AI 🛠️ Where I've worked • UI/UX & Full-Stack Developer, Nexa Creative Solutions, modern web apps, Figma to React • WordPress Developer, Digital Vertex Agency, custom themes, plugins, performance • Front-End Developer, BrightPixel Studio, responsive builds, landing pages, UI implementation 🚀 Projects I've built • Movix, fleet transporter management & logistics SaaS • Luna Fleet, fleet management & GPS tracking platform • EstateSync, real estate investment SaaS platform 💡 Why work with me • Scope-first: I understand the goal and data before touching architecture • Clear communication, steady weekly progress, no surprises • Comfortable owning a frontend end-to-end, or stepping into an existing codebase • Background spanning full-stack, UI/UX, and WordPress, flexible to what the job actually needs Tell me what you're building and I'll give you a straight, honest answer on how I'd approach it.

I build complete products 𝗺𝗼𝗯𝗶𝗹𝗲 𝗮𝗽𝗽𝘀, 𝘄𝗲𝗯 𝗽𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀, and 𝗨𝗜/𝗨𝗫 𝗱𝗲𝘀𝗶𝗴𝗻𝘀 as your 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿, from Figma to App Store to live deployment. Shipped 𝗔𝗹-𝗙𝗮𝗹𝗮𝗵 to 𝟱𝟬,𝟬𝟬𝟬+ iOS users. Built 𝗖𝗮𝗻𝘇𝗲𝘆 serving 𝟭,𝟬𝟬𝟬+ daily active users. One 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿, full ownership. I'm a 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 working across React Native, Flutter, React & Node.js, with 10+ years shipping mobile and web apps at scale. As a 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿, design to App Store, I own it all. Clients work with one 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿, not a team of five. 𝗪𝗛𝗔𝗧 𝗜 𝗕𝗨𝗜𝗟𝗗 𝗔𝗦 𝗔 𝗙𝗨𝗟𝗟 𝗦𝗧𝗔𝗖𝗞 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗘𝗥: Mobile Apps built end-to-end as your 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 - React Native & Flutter for iOS + Android (single codebase) - Native iOS in Swift/SwiftUI when required - Firebase backend, push notifications, offline support - In-app purchases, AdMob, App Store & Play Store deployment Web & Backend built end-to-end as your 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 - React/Next.js frontends with responsive design - Node.js/Express backends with REST APIs - PostgreSQL & MongoDB databases - Stripe payment integration - Real-time features (WebSockets, live updates) UI/UX & Design - Figma UI/UX design for mobile and web - Design systems, components, and auto-layout - Wireframes, prototypes, and developer-ready handoff - Dark/light themes, responsive layouts, brand-consistent UI 𝗦𝗣𝗘𝗖𝗜𝗔𝗟𝗜𝗭𝗘𝗗 𝗜𝗡 𝗔𝗦 𝗔 𝗙𝗨𝗟𝗟 𝗦𝗧𝗔𝗖𝗞 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗘𝗥: ✓ On-demand apps (delivery, booking, ride-hailing) ✓ FinTech & payment integration (Stripe, Apple Pay, in-app purchases) ✓ 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 for SaaS platforms & admin dashboards ✓ 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 for e-commerce & marketplace platforms 𝗧𝗘𝗖𝗛 𝗦𝗧𝗔𝗖𝗞 (𝗙𝗨𝗟𝗟 𝗦𝗧𝗔𝗖𝗞 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗘𝗥): Mobile: Flutter, Dart, Swift, SwiftUI, Kotlin, React Native Frontend: React, Next.js, TypeScript, Tailwind CSS Backend: Node.js, Express, GraphQL, REST APIs Database: PostgreSQL, MongoDB, Firebase Firestore, Spabase Payments: Stripe, PayPal, RevenueCat, Apple Pay, Google Pay Design: Figma, UI/UX, Wireframing, Prototyping DevOps: AWS, Vercel, Docker, CI/CD, GitHub Actions 𝗠𝗬 𝗣𝗥𝗢𝗖𝗘𝗦𝗦 𝗔𝗦 𝗬𝗢𝗨𝗥 𝗙𝗨𝗟𝗟 𝗦𝗧𝗔𝗖𝗞 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗘𝗥: 1. Requirements analysis & technical planning 2. Figma design implementation 3. Agile development with weekly progress updates 4. Testing on staging environment 5. Production deployment & post-launch support Based in 𝗡𝗲𝘄 𝗬𝗼𝗿𝗸, 𝗨𝗦𝗔 (𝗘𝗦𝗧) available during 𝗨𝗦 𝗯𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗵𝗼𝘂𝗿𝘀. One 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿, always in your corner. Whether it's a new build or a fix, I'm the 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 who takes it start to finish. Response time: 𝟮–𝟰 𝗵𝗼𝘂𝗿𝘀. Message me with your project details. Full Stack Developer | Flutter Full Stack Developer | Full Stack Flutter Developer | React Full Stack Developer | Full Stack React Developer | Node.js Full Stack Developer | Full Stack Node.js Developer | Mobile Full Stack Developer | Full Stack Mobile App Developer | Web Full Stack Developer | Full Stack Web Developer | SaaS Full Stack Developer | Full Stack SaaS Developer | eCommerce Full Stack Developer | Full Stack eCommerce Developer | Next.js Full Stack Developer | Full Stack Next.js Developer | API Full Stack Developer | Full Stack API Developer | Backend Full Stack Developer | Full Stack Backend Developer| React Native Developer

If you're building an AI powered product and need someone who can own the full stack from LLM architecture to production UI you're in the right place. I'm a Senior AI Full Stack Engineer with 8+ years of experience designing and shipping systems that combine deep AI backends with polished, performant frontends. My stack: Python (FastAPI, Django) · Node.js · Next.js · TypeScript · React · LangChain · LangGraph · OpenAI · Claude · Pinecone · PostgreSQL · AWS ───────────────────────────────────────── WHAT I BUILD ───────────────────────────────────────── → AI Full Stack Applications Next.js + Python backends with real-time LLM streaming, auth, and multi-tenancy → RAG & Knowledge Systems Hybrid retrieval (dense + sparse), reranking, embedding optimization, citations → Agentic AI Systems Tool-calling agents with memory, orchestration layers, and reflection loops → Scalable API Backends FastAPI / Node.js microservices, async pipelines, RBAC, REST & GraphQL → Compliant Enterprise AI HIPAA-ready healthcare AI, FinTech-grade secure backends ───────────────────────────────────────── PRODUCTION SYSTEMS I'VE SHIPPED ───────────────────────────────────────── ✔ AI clinical documentation agent — HIPAA-compliant, EHR-integrated, in active use ✔ Enterprise RAG platform — hybrid search over structured + unstructured data at scale ✔ AI SEO intelligence SaaS — semantic analysis across billions of documents ✔ Geospatial risk engine — PostGIS + H3 + real-time scoring for PropTech client ✔ Autonomous ingestion agents — schema drift detection, background orchestration ✔ AI marketing SaaS — website and campaign generation from natural language prompts ✔ Secure multi-tenant SaaS — role-based access, audit logging, enterprise deployment ───────────────────────────────────────── FULL STACK AI — WHAT THAT MEANS ───────────────────────────────────────── Most AI engineers can't build the frontend. Most frontend engineers can't architect the AI layer. I do both — and I connect them cleanly: - Python AI backend → FastAPI / LangGraph / async inference pipelines - Node.js middleware → BFF layers, webhooks, queue workers, integrations - Next.js frontend → Server components, streaming UI, real-time AI interfaces - Vector + Relational DB → Pinecone, PostgreSQL, Redis, Elasticsearch - Cloud → AWS (EC2, Lambda, S3, RDS), Docker, Kubernetes, CI/CD ───────────────────────────────────────── HOW I WORK ───────────────────────────────────────── I don't prototype and disappear. I take projects through: Architecture → MVP → Production Hardening → Monitoring → Scale You get: clean documentation, maintainable code, and a partner who communicates clearly and moves fast. ───────────────────────────────────────── LET'S WORK TOGETHER ───────────────────────────────────────── Send me: - What you're building - Your timeline and budget I'll respond within 24 hours and tell you exactly how I'd approach it. Core Stack Next.js Developer, Python, Node.js, TypeScript, React, FastAPI Developer, Django, Express.js AI & LLMs LLM Application Development, LangChain Developer, LangGraph, RAG Engineer, AI Agent Architect, Prompt Engineering, Multi-Agent Systems, Fine-Tuning (LoRA/QLoRA), LLM Evaluation, Generative AI, OpenAI API, Claude API, Gemini API Data & Search Retrieval-Augmented Generation, Vector Database, Pinecone, Weaviate, Milvus, Semantic Search, Hybrid Search, Elasticsearch, PostgreSQL pgvector Backend & Infra REST API, GraphQL, Microservices, Serverless, AWS (Lambda, EC2, S3), Docker, Kubernetes, CI/CD, Async Python, Queue Workers (Celery, Bull) Domains & Compliance HIPAA-Compliant Developer, Healthcare AI (HealthTech), FinTech Backend, SaaS Architecture, Multi-Tenant Systems, SOC2, Role-Based Access Control (RBAC) Long-Tail Phrases "tool-calling agents with memory", "hybrid dense and sparse retrieval", "real-time LLM streaming", "EHR-integrated AI", "autonomous ingestion agents", "production AI systems"