Mariya S.

$1M+ earned on Upwork. 25+ years, 700+ projects, and deep JavaScript/TypeScript expertise across React, Next.js, Node.js & NestJS. I build and scale SaaS, web apps, automation, APIs, and complex platforms from architecture to production. 👋 I’m a veteran Senior Full-Stack JavaScript/TypeScript Engineer, Full Stack JavaScript Developer, React Developer, Node.js Developer, and Web Developer. Whether you need a react developer, web app developer react specialist, or full stack developer react node engineer, I own the full lifecycle: architecture, UI, backend, cloud, integrations, and production support. Core stack: React, React.js, Next.js, Node.js, NestJS, TypeScript, Vue.js, Angular, PostgreSQL, MongoDB, Redis, AWS, and Docker. My projects span React SaaS, React AI, eCommerce, Fintech, EdTech, Healthcare, CRM, Web-to-Print, and marketplaces. 🏆 RESULTS & EXPERIENCE ✔ 25+ years in full stack development; 700+ projects delivered ✔ Systems handling 10M+ API requests per month ✔ 30+ apps scoring 90–100 in Lighthouse audits ✔ Backend performance improvements up to 50% ✔ AWS serverless, event-driven architecture, CI/CD, and monorepos ⚡ FRONTEND / REACT DEVELOPMENT As a Senior React Developer and Frontend Developer, I build SaaS dashboards, marketplaces, internal tools, and customer-facing apps. From react next js developer work to react remix developer projects, I focus on fast, maintainable interfaces. • React 18, React.js, Next.js 14+, Vue.js, Angular, TypeScript; SPA, SSR, ISR, PWA • Tailwind CSS, Material UI, SCSS, Bootstrap, Storybook, design systems • Figma to React implementation, Figma React handoffs, and web design React workflows • React developer Firebase apps, secure authentication, and real-time dashboards • React Web3 integrations, AI features, analytics, charts, data visualization • Nx, Turborepo, micro frontends, Lighthouse optimization • Chrome extensions, Puppeteer, Playwright, browser automation, testing • Interactive UI, game developer typescript react needs, and video streaming features 🔌 NODE.JS / BACKEND DEVELOPMENT As a Node.js Developer and Backend Developer, I build scalable APIs, real-time systems, and automation: full stack node.js react applications, node.js backend developer engagements, and back end developer node.js architecture. • Node.js, NestJS, Express, Koa, Hapi; REST API, GraphQL, microservices • PostgreSQL, MongoDB, MySQL, DynamoDB, Firebase, Redis, Prisma, TypeORM • JWT, OAuth, RBAC, WebSockets, Kafka, BullMQ, background workers • Node.js React, Vue.js Node.js, Node.js AWS; Lambda, SQS, EventBridge, Step Functions • React Python applications, Django React interfaces, React Django Developer integrations, Python Flask React services, and React FastAPI backends • Cross-stack integrations: C# React, Ruby on Rails React, React WordPress, and PHP/Laravel systems (including “laravel expert nodejs” requests) • Full stack developer Supabase React products with auth, databases, and real-time features • ETL, OpenAI API, Dialogflow, analytics processing, and AI automation 📱 REACT NATIVE / MOBILE DEVELOPMENT For mobile app development React and mobile app development React Native, I work as a React Native Developer and React Native App Developer, connecting mobile UI to reliable APIs. • React Native, React Native mobile, React Native iOS/Android, and responsive mobile UI • React Native Developer Expo, React Native Expo, React Native Tailwind • React Native UI UX, React Native Animation, Firebase, push notifications • React Native Firebase AdMob and BuddyBoss React Native integrations • Flutter Node.js APIs, Full Stack React Native Spring Boot, and React Next Node Supabase React Native architectures • Collaboration with native teams seeking a mobile app developer with expertise in ios and android ☁️ CLOUD, DEVOPS & DELIVERY Production infrastructure with AWS, Docker, CloudFront, S3, Vercel, AWS CDK, GitHub Actions, GitLab CI/CD, Sentry, Datadog, Redis caching, and infrastructure as code. 🌍 PRODUCTS I BUILD • SaaS, startup MVPs, AI automation, eCommerce, marketplaces, CRM, ERP • Fintech, analytics, Healthcare, EdTech, dashboards, browser extensions • APIs, workflow automation, real-time reporting, legacy modernization • Python-backed React platforms for teams seeking a “full stack developer with expertise in python django and react” • Data-rich streaming platforms with briefs like “fullstack developer figma mongo sql react next video streaming” ⚙️ CORE TECHNOLOGIES JavaScript, TypeScript, React, React.js, Next.js, Vue.js, Angular, Node.js, NestJS, PostgreSQL, MongoDB, Redis, AWS, Docker, Firebase, GraphQL, WebSockets, Puppeteer, Playwright, Stripe, OpenAI API, SendGrid, PandaDoc. ✅ LET’S BUILD A PRODUCT THAT CAN SCALE Need a Senior Full Stack Developer, Full Stack JavaScript Developer, React Developer, Next.js Developer, Node.js Developer, Backend Developer, or Web Developer to own architecture and delivery? Message me.