Hire the Best Express Js Developers in Washington

Upwork Expert Vetted Badge owner, which means among the top 1% of talents on Upwork. I have over 20 years of software development experiences working for leading tech companies such as Microsoft, Starbucks, Institute for Systems Biology. I'm passionate in software development and new technologies. Very quick learner and excellent team worker. Open-minded and can quickly fit into any environment and contribute to the projects. My experiences and visions will be a great value for any company. I'm a USA citizen. Self-motivated, energetic collaborator who thrives on working in a fast-paced environment with tight deadlines and have a desire to stay updated on current and new technologies. As a passionate full-stack developer with can-do attitude, I'm thrilled to leverage my technical experience to implement client's ideas into reality. I’m proud that my web development work has helped my clients to grow their businesses and generate more revenue. My strength is creativity and tenacity. I emphasize effective communication to gather client’s requirements and translate those into an engaging, effective and unique software solution with great architecture and high quality implementation is what has helped me obtain over 100 positive reviews. - Strong problem solving skills - Clear logic & Clean code - Smart development & accurate timeline - Effective and respectful communication & excellent teamwork - Responsive & Pixel-perfect fronted development My skill sets are • AI, Machine Learning, Big Data • Blockchain • Programming Languages: JavaScript/Typescript, Python, PHP, Java, .Net, C++ • Front-End Development: React.js, React Native, Angular, Vue.js, Next.js, Nuxt.js, jQuery, HTML, CSS., SCSS • Back-End Development: Node.js/Express framework, Django, Flask, Laravel, Java, .Net • Database Management: SQL/NOSQL databases • Could: Amazon Web Services (AWS), Azure, Google Cloud • Other: DevOps, Kubernetes, Docker, GIT Availability - Flexible in any time zone - 40+ hours per week - Bilingual Communication in English, Mandarin Chinese Thank you

AI Engineer & Full Stack Developer specializing in AI automation, SaaS platforms, and intelligent applications. I help startups and founders build and scale production-ready AI-powered products and automated systems. With 10+ years of experience and a 100% Job Success Score, I deliver complete solutions from architecture to deployment. 🤖 AI Engineering & Automation OpenAI, ChatGPT, LangChain, RAG pipelines, intelligent agents, AI chatbots, vector search and embeddings (Pinecone), semantic search, and automated workflow systems. 💻 Backend Development Python, FastAPI, Django, Flask, Node.js, Express REST APIs, GraphQL, microservices architecture, authentication and authorization, and row-level security. 🎨 Frontend Development React, Next.js, TypeScript, Tailwind CSS server-side rendering (SSR), static site generation (SSG), incremental static regeneration (ISR), and state management with Redux and Zustand. 🗄️ Databases Supabase, PostgreSQL, MongoDB schema design, Edge Functions, and real-time features. ☁️ Cloud & DevOps AWS, GCP, Docker, Vercel, Firebase, CI/CD pipelines. What I deliver: → AI-powered SaaS platforms and MVPs → Intelligent chatbots and LLM-based automation systems → Full-stack web applications with clean, scalable architecture → Seamless third-party integrations (Stripe, webhooks, and more) Why clients trust me: → End-to-end ownership of projects → Fast response time and proactive communication → Clean, well-documented, and scalable code → Consistent on-time delivery with no surprises If you're looking for a reliable AI Engineer and Full Stack Developer to bring your automation or SaaS vision to life, send me your project details and rough budget if available. I'll reply with a clear technical approach and timeline. Keywords: AI Engineer, AI Automation Developer, AI Integration Specialist, Senior Full Stack Developer, Python Developer, FastAPI Developer, Django Developer, Flask Developer, Node.js Developer, React Developer, Next.js Developer, TypeScript Developer, GraphQL Developer, API Developer, REST API Development, Microservices, SaaS Developer, SaaS MVP Developer, RAG Developer, LangChain Developer, OpenAI Developer, ChatGPT Integration, Generative AI Developer, AI Chatbot Development, LLM Application Developer, Vector Search, Semantic Search, Embeddings, AWS Developer, GCP Developer, Docker, CI/CD, Supabase Developer, PostgreSQL Developer, MySQL, MongoDB, Stripe Integration, Payment Integration, Webhook Automation, Server-Side Rendering, State Management, FinTech Developer, E-commerce Developer, Logistics Platform Developer

𝗠𝗼𝘀𝘁 𝗳𝘂𝗹𝗹 𝘀𝘁𝗮𝗰𝗸 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿𝘀 𝗯𝘂𝗶𝗹𝗱 𝗳𝗲𝗮𝘁𝘂𝗿𝗲𝘀. 𝗜 𝗯𝘂𝗶𝗹𝗱 𝘀𝘆𝘀𝘁𝗲𝗺𝘀 𝘁𝗵𝗮𝘁 𝗿𝗲𝗴𝘂𝗹𝗮𝘁𝗲𝗱 𝗶𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 𝗰𝗮𝗻 𝗮𝗰𝘁𝘂𝗮𝗹𝗹𝘆 𝘁𝗿𝘂𝘀𝘁 - 𝗮𝗻𝗱 𝗸𝗲𝗲𝗽 𝘁𝗿𝘂𝘀𝘁𝗶𝗻𝗴 𝘄𝗵𝗲𝗻 𝘁𝗵𝗲 𝗹𝗼𝗮𝗱 𝗱𝗼𝘂𝗯𝗹𝗲𝘀, 𝘁𝗵𝗲 𝗮𝘂𝗱𝗶𝘁𝗼𝗿𝘀 𝘀𝗵𝗼𝘄 𝘂𝗽, 𝗼𝗿 𝘁𝗵𝗲 𝘁𝗲𝗮𝗺 𝗻𝗲𝗲𝗱𝘀 𝘁𝗼 𝗺𝗼𝘃𝗲 𝗳𝗮𝘀𝘁 𝘄𝗶𝘁𝗵𝗼𝘂𝘁 𝗯𝗿𝗲𝗮𝗸𝗶𝗻𝗴 𝘄𝗵𝗮𝘁 𝗶𝘀 𝗮𝗹𝗿𝗲𝗮𝗱𝘆 𝗹𝗶𝘃𝗲. I specialize in production-grade SaaS for Healthcare (HIPAA), Fintech, and compliance-heavy verticals, where getting it wrong is not an option. Eight years in, across systems that serve hundreds of thousands of real users, I have learned that the difference between software that holds up and software that does not is almost never the framework, it is the architecture decisions made at the start and the discipline maintained throughout. 𝗪𝗛𝗔𝗧 𝗜 𝗕𝗨𝗜𝗟𝗗 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗪𝗲𝗯 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 Next.js (App Router, SSR, SSG, ISR) with TypeScript and Tailwind on the frontend. Node.js or Python using Express, Django, and FastAPI on the backend. Prisma, PostgreSQL, Supabase, and MongoDB for the data layer. Multi-tenant architecture from day one, secure authentication, and clean AWS deployments using Docker, Nginx, and GitHub Actions. Systems built to scale without needing a complete rewrite six months later. 𝗔𝗜-𝗡𝗮𝘁𝗶𝘃𝗲 𝗙𝗲𝗮𝘁𝘂𝗿𝗲𝘀 & 𝗟𝗟𝗠 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 RAG pipelines over private documents with controlled hallucination. LLM-powered workflows, multi-agent systems, and document intelligence for businesses where accuracy matters. Experience with OpenAI, Claude, Gemini, and Mistral, alongside LangChain, LlamaIndex, LangGraph, Pinecone, Weaviate, FAISS, and Chroma. 𝗥𝗲𝗴𝘂𝗹𝗮𝘁𝗲𝗱 & 𝗛𝗶𝗴𝗵-𝗦𝘁𝗮𝗸𝗲𝘀 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝘀 HIPAA-compliant healthcare SaaS with custom Stripe billing and automated invoicing (AlignerBase). Mental health platform serving 800K+ users (MoodMe). SaaS marketplace supporting 250K+ concurrent users across 200+ venues and 60+ APIs (FanFood). Fintech and Web3 platforms where transaction security was mission-critical (CoinBaazar, BedrockSwap). AI operations, analytics, and mortgage underwriting platforms including OscarAI and GuidelineBuddy. 𝗦𝘁𝗿𝗶𝗽𝗲 𝗕𝗶𝗹𝗹𝗶𝗻𝗴 & 𝗣𝗮𝘆𝗺𝗲𝗻𝘁 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 Subscriptions, metered billing, usage-based pricing, add-ons, webhooks, and automated invoicing designed to keep billing accurate, reliable, and easy to manage as your business grows. 𝗛𝗢𝗪 𝗜 𝗪𝗢𝗥𝗞 I start by understanding what the product needs to achieve before deciding how to build it. Architecture, security, scalability, infrastructure, and AI decisions all follow from the business requirements, not the other way around. If I'm joining an existing product, the first thing I do is understand the codebase before changing it. I review the architecture, identify risks, strengthen critical areas with proper testing, build a clear roadmap, and then start shipping improvements with confidence. No cowboy commits. No "it worked on my machine." No Friday deployments that leave you fixing production issues over the weekend. I also build React Native applications using Expo and EAS, including App Store and Google Play deployment, along with AI voice agents powered by Twilio, LiveKit, and Retell whenever a project requires conversational AI. If you're building software that needs to perform reliably in production, not just look good in a demo - send me a message and tell me what you're building. I'll explain exactly how I'd approach it. 𝗞𝗘𝗬𝗪𝗢𝗥𝗗𝗦 Full Stack Developer, Full Stack Engineer, Next.js Developer, React Developer, Node.js Developer, Python Developer, TypeScript Developer, SaaS Developer, AI Developer, LLM Integration, RAG Developer, LangChain, AI Engineer, Generative AI, OpenAI API, FastAPI, Django Developer, HIPAA Compliant SaaS, Healthcare SaaS, Fintech Developer, Multi-Tenant SaaS, Stripe Integration, PostgreSQL, MongoDB, AWS, Docker, React Native, AI Voice Agent, Web Application Development, SaaS Platform Development, Full Stack AI Engineer, Production SaaS, AI Integration

I'm a full-stack developer based in Washington State, focused on building clean and functional web applications. My stack: React, Angular, Node.js, PostgreSQL, MongoDB, REST APIs, Git, HTML, CSS, JavaScript, TypeScript. Recent projects: - RecipeShare: solo full-stack recipe-sharing app (React, serverless backend, MongoDB, Cloudinary) - live and deployed - Expense Tracker: solo fullstack app with Angular, Node.js, PostgreSQL and JWT auth - Water Tracker: team project with React, Redux Toolkit and Node.js (7 developers) What I can help you with: - Adding features or fixing bugs in existing React or Angular apps - Fixing CSS, HTML, JavaScript issues - Making websites responsive and mobile-friendly - Building small apps or MVPs from scratch - Connecting frontend to REST APIs - Clean code, clear communication, on-time delivery I speak English, Ukrainian, Russian and Polish. Based in Washington state, US — available across all US time zones.

8+ years of experience. 100+ successfully delivered projects. Top-rated Plus Upwork pro. Do you need a reliable and highly experienced developer for your WordPress project? Do you need a problem solver who not only has a strong technical background, but also banks on your success? My clients praise my ability to communicate and successfully deliver projects on time. You'll gain a valuable partner and asset, not just another developer. We'll work great together because: • I get you through common project roadblocks that less experienced freelancers don't see. • I prioritize your needs. Delivering a product is only half the experience. The other half is keeping the project on track, keeping you updated, and communicating effectively when needed. • My success relies on your success. I am best known for: • SEO; Core Web Vitals and Page Speed Score improvements, Theme and/or Plugin optimization. • Troubleshooting and fixing critical WP errors and addressing site downtime. • WordPress theme and plugin development. • eCommerce/wooCommerce websites, subscription sites • Advanced web development work such as API integrations, React/Vue, etc. Itching to get a project started? The best way to reach me is through a direct message or consultation. I look forward to chatting with you!

● Experience developing web apps using MVC Architecture, service orientated architecture building single and multi page apps and RESTful APIs ● Practical knowledge working in the complete SDLC including creating, design, documentation, development and unit testing of applications ● Motivated to produce clean, performant and robust software; highly passionate about programming ● Excellent understanding of React and Functional Driven JavaScript, UI Components, Mobile web and Performance optimization ● Able conceptualize, design, develop, implement and enhance web apps using JavaScript, React, Node, SCSS, Bootstrap, Material UI, Ruby on Rails, and Ruby