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