Mykyta N.

🟢 NODE.JS BACKEND DEVELOPER | 20,000+ development hours | 30+ products shipped | 20K+ users supported | $8K+ MRR SaaS Looking for a Node.js Developer who can take ownership of your backend, fix a production issue, or turn an idea into a working SaaS product? I build Node.js and NodeJS applications with JavaScript, TypeScript, ExpressJS, MongoDB, React and Next.js. My work covers backend architecture, RESTful API development, database design, payment integrations, authentication, real-time features and production support. I work on both new Node.js products and existing codebases. You get a developer who can understand the business logic, trace problems across services and databases, and ship changes without unnecessary rewrites. 🚀 PROVEN DEVELOPMENT EXPERIENCE 🏆 20,000+ hours in software development 🚀 30+ products launched into production 👥 Systems supporting 20K+ users 📈 SaaS product reaching $8K+ MRR within 6 months 💳 Stripe, PayPal and LiqPay payment integrations 🗄 MongoDB, PostgreSQL, MySQL and Redis experience ⚡ NODE.JS BACKEND DEVELOPMENT As a Node.js Backend Developer, I build reliable NodeJS services using JavaScript, TypeScript, ExpressJS and NestJS. I can develop a new backend or improve an existing Node.js application. ▸ Node.js architecture and backend business logic ▸ ExpressJS / NestJS services and middleware ▸ REST API, GraphQL and API Development ▸ Authentication, JWT, OAuth and permissions ▸ MongoDB, PostgreSQL and MySQL databases ▸ Payment gateways, subscriptions and webhooks ▸ Redis caching, queues and background jobs ▸ WebSockets and real-time NodeJS features ▸ Node microservices and third-party API Integration ▸ Docker, AWS, CI/CD and production deployment 🔌 NODE.JS API DEVELOPMENT & INTEGRATION Need to build or repair an API? I develop RESTful APIs with Node.js, ExpressJS and TypeScript, from endpoint design and validation to authentication, documentation and external integrations. For existing NodeJS APIs, I investigate failing requests, fix webhook processing, improve error handling, optimize database calls and add endpoints. I can also connect Stripe, PayPal, LiqPay, OpenAI/LLM APIs and other third-party services. 🍃 NODE.JS + EXPRESSJS + MONGODB I build JavaScript backend applications with Node.js, ExpressJS and MongoDB: data models, queries, indexes, APIs and business workflows. When relational data fits better, I use PostgreSQL or MySQL. For larger modular TypeScript systems, NestJS can be the right choice. The goal is maintainable Node.js code and a database architecture that matches your actual product. ⚛️ REACT + NODE.JS | FULL STACK NODEJS My main focus is Node.js, but I can also implement full-stack features with React, Next.js, JavaScript and TypeScript. React / Next.js → REST API → Node.js / ExpressJS → MongoDB / PostgreSQL As a React Node developer, I connect user interfaces to NodeJS backend services, implement dashboards, authentication flows and API-driven product features. This is useful when you need one developer to handle both sides of a feature. 🛠 EXISTING NODE.JS CODEBASE? I CAN HELP ▸ Debug Node.js and ExpressJS production bugs ▸ Refactor JavaScript and TypeScript code ▸ Improve slow REST API endpoints ▸ Optimize MongoDB and PostgreSQL queries ▸ Fix payment webhooks and API integrations ▸ Add Redis caching and background processing ▸ Build new NodeJS features and services ▸ Connect React or Next.js to existing APIs I review the current architecture first, preserve what works, and prioritize changes by impact. 💼 PRODUCTS I BUILD 🚀 SaaS — Node.js backend, accounts, subscriptions and roles 🤖 AI platforms — NodeJS, LLM APIs and automation 💳 FinTech — payment flows, transactions and integrations 🏥 Healthcare — asset tracking, scheduling and service workflows 💼 CRM — ExpressJS APIs, users and business automation 🛒 Marketplaces — Node.js services, listings and payments 📊 Dashboards — React, Next.js and NodeJS APIs 💬 Real-time apps — Node.js, WebSockets and Redis 🎯 HOW I WORK Review your requirements, existing Node.js code and API architecture. Define the backend approach, database changes and priorities. Build and test with Node.js, TypeScript, ExpressJS or NestJS. Integrate, deploy and improve performance in production. 🔎 CORE NODE.JS SKILLS Node.js | NodeJS | Node.js Developer | Node.js Backend Developer | Backend NodeJS | Back End Developer Node.js | JavaScript | TypeScript | ExpressJS | MongoDB | React | React NodeJS | Full Stack NodeJS | Next.js | NestJS | RESTful API | API Development | API Integration | PostgreSQL | Redis | AWS | Docker 📩 Click INVITE and send me your Node.js requirements, API documentation or existing backend issue. I'll suggest a practical next step.