Talent badge filter
Skills filter
Arsene O.
$25/hr
100% Job Success
$80K+ earned
Start of list.
End of list.
⚙️ Building Scalable Digital Products with React, Node.js & Python ⚙️ 📅 6+ years of experience 📦 40+ completed projects 💰 $9M+ generated for clients 🌍 Platforms with 80,000+ active users I’m a Full Stack Developer and Full Stack React Developer with 6+ years of experience building scalable web applications. As a React Developer, React.js Developer, and Next.js Developer, I deliver modern frontend systems combined with powerful backend architectures. My backend expertise spans Node.js, Python, Django, and FastAPI, allowing me to build both high-performance APIs and enterprise-grade systems. I work as a Node.js Developer, Python Developer, Django Developer, and FastAPI Developer, depending on project requirements. As a Full Stack Developer, I frequently combine React.js, Node.js, Python, Django, and FastAPI to deliver complete end-to-end solutions. 🚀 Full Stack React, Node.js & Python Engineering I work as a Full Stack Developer, Full Stack React Developer, and React Node.js Developer, building scalable applications with React.js, Next.js (Nextjs), and robust backend systems powered by Node.js, Python, Django, and FastAPI. I use Node.js daily for backend services, APIs, and real-time systems. As a Node.js Developer, I build scalable microservices and backend logic that integrate seamlessly with frontend applications. Alongside Node.js, I use Python, Django, and FastAPI for more complex backend architectures. Django is ideal for structured systems, while FastAPI is perfect for high-performance asynchronous APIs. My experience includes combining Node.js, Python, Django, and FastAPI in production environments where performance and scalability are critical. As a Full Stack Developer and Node.js Developer, I focus on: ⚙️ Improving performance (LCP/TTI) by 2–3x 📊 Increasing conversions by 25–35% 🚀 Scaling apps to 100K+ users 🧠 Backend Development with Node.js, Python, Django & FastAPI As a Node.js Developer, Python Developer, Django Developer, and FastAPI Developer, I build APIs, backend systems, and scalable services. I use Node.js for real-time systems, event-driven architectures, and high-performance APIs. I also use Python, Django, and FastAPI to build structured backend platforms and high-speed microservices. In multiple projects, I combined Node.js with Python, Django, and FastAPI to create hybrid backend ecosystems. 🗄 Databases & Backend Architecture As a Full Stack Developer and Node.js Developer, I work with SQL, PostgreSQL, MySQL, and MongoDB to design scalable systems. I frequently integrate Node.js with PostgreSQL and MongoDB, and also use Python, Django, and FastAPI with relational databases for enterprise applications. I also use Supabase (PostgreSQL-based backend) alongside Node.js, Python, Django, and FastAPI. 🧠 Built systems using Node.js, Python, Django, and FastAPI 🔄 Designed APIs with Node.js and FastAPI 💸 Reduced backend costs with optimized Node.js services 🚀 Improved system performance using Node.js and Python 🎨 Frontend React & Next.js With 6+ years as a React Developer, React.js Developer, and Frontend React Developer, I build fast UI systems using React.js and Next.js (Nextjs). As a Full Stack Developer, I connect frontend applications with backend systems powered by Node.js, Python, Django, and FastAPI. 📱 React Native & Cross-Platform Apps As a React Native Developer, alongside my work as a Full Stack Developer and Node.js Developer, I build mobile applications connected to backend systems powered by Node.js, Python, Django, and FastAPI. 📱 10+ apps delivered 👥 100K+ users supported 💳 SaaS, Payments & Scalable Platforms Most backend logic in these systems is built with Node.js, while complex services often use Python, Django, and FastAPI. ⚙️ Additional Expertise 40+ projects as a Full Stack Developer and Full Stack React Developer Strong experience as a Node.js Developer, Python Developer, Django Developer, and FastAPI Developer Deep expertise in Node.js, Python, Django, and FastAPI backend systems Strong frontend skills with React.js and Next.js Experience with MongoDB, SQL, PostgreSQL, and MySQL Experience with Supabase and real-time systems AI integrations (OpenAI, ChatGPT) using Node.js and Python Built dashboards, PWAs, and SaaS platforms using Node.js, Django, and FastAPI 🤝 Why Work With Me Strong Full Stack Developer with deep backend expertise in Node.js, Python, Django, and FastAPI Experienced React Developer and Full Stack React Developer Skilled in building scalable backend systems using Node.js and Python Strong architecture thinking across frontend and backend If you’re looking for a Full Stack Developer, Node.js Developer, Python Developer, Django Developer, or FastAPI Developer with strong experience in React.js and Next.js — let’s connect. 👉 Click "Invite" or "Hire" and tell me about your project.
Arsene O. has worked .
Golden Team Soft
Associated with
Golden Team Soft
$6M+
earned
Andrei L.
$36/hr
100% Job Success
$200K+ earned
Start of list.
End of list.
🚀 Hi! I'm a full-stack developer with over 9 years of experience building web and mobile apps that 𝐬𝐨𝐥𝐯𝐞 𝐫𝐞𝐚𝐥 𝐛𝐮𝐬𝐢𝐧𝐞𝐬𝐬 𝐩𝐫𝐨𝐛𝐥𝐞𝐦𝐬. 💡 I help 𝐬𝐭𝐚𝐫𝐭𝐮𝐩𝐬 and 𝐛𝐮𝐬𝐢𝐧𝐞𝐬𝐬𝐞𝐬 build 𝐟𝐚𝐬𝐭 and 𝐮𝐬𝐞𝐫-𝐟𝐫𝐢𝐞𝐧𝐝𝐥𝐲 applications that are 𝐞𝐚𝐬𝐲 𝐭𝐨 𝐦𝐚𝐢𝐧𝐭𝐚𝐢𝐧 and 𝐝𝐞𝐩𝐥𝐨𝐲. 💡 Whether you need to 𝐥𝐚𝐮𝐧𝐜𝐡 𝐚𝐧 𝐌𝐕𝐏, scale an existing app, or 𝐚𝐝𝐝 𝐫𝐞𝐚𝐥-𝐭𝐢𝐦𝐞 𝐟𝐞𝐚𝐭𝐮𝐫𝐞𝐬, I can help you 𝐛𝐫𝐢𝐧𝐠 𝐲𝐨𝐮𝐫 𝐯𝐢𝐬𝐢𝐨𝐧 𝐭𝐨 𝐥𝐢𝐟𝐞 𝐨𝐧 𝐭𝐢𝐦𝐞 and 𝐨𝐧 𝐛𝐮𝐝𝐠𝐞𝐭. 🏆 𝐅𝐫𝐨𝐧𝐭-𝐄𝐧𝐝 𝐒𝐤𝐢𝐥𝐥𝐬: JavaScript, TypeScript, React, Angular, Vue, Redux, TypeScript, HTML5, CSS3, SASS, Bootstrap, Material UI, Webpack, GraphQL, REST API integration, cross-CMS templating, PHP 🏆𝐓𝐨𝐨𝐥𝐬: Git, Composer, Digital Asset Management systems 🏆𝐂𝐌𝐒 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Drupal (expert level), Wordpress, WooCommerce, Salesforce, Squarespace, AEM, Elementor, Custom 🛠 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐲 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞: 🧬 Healthcare & Wellness & MedTech | 💰 Fintech & Crypto & Banking | 🏝️ Real Estate & Travel | 🛒 Marketplace & Ecommerce | 🤖 IoT & SaaS & MVP | 💻 CRM & ERP | 🌐 LLM & AI & EdTech 🧠 𝐁𝐨𝐧𝐮𝐬 𝐒𝐤𝐢𝐥𝐥𝐬: I follow agile practices, write clean code, and stay transparent throughout the project to deliver on time and within scope. Whether you're starting from scratch or scaling an existing system, I’ll help you build something reliable and ready for growth. 💬 𝐋𝐞𝐭’𝐬 𝐁𝐮𝐢𝐥𝐝 𝐒𝐨𝐦𝐞𝐭𝐡𝐢𝐧𝐠 𝐑𝐞𝐥𝐢𝐚𝐛𝐥𝐞ⵑ If you're looking for a Front-End developer who can dive into complex architectures and deliver fast, maintainable, business-ready solutions — I’m your guy. Let’s talk! Keywords Full-Stack Development, Web Development, Solution Architecture, Web Application, Mobile App Development, Microservice, Central Desktop Development, Cross-Device Compatibility, Web Development Consultation, React Native, JavaScript, Node.js, Golang, Mobile App, App Development, IT Compliance Audit, HIPAA, React, Database, Mobile Development Framework, Hybrid App Development, Mobile App Improvement, Mobile App Localization, Android App Development, iOS Development, Mobile App Testing, Web App Localization, Android App, Startup Company, Business with 1000+ Employees, Business with 1-9 Employees, Business with 10-99 Employees, Cross-Device Compatibility, App Feature Development, Innovation Strategy, App Development, Application Integration Software, Application Integration, Application Optimization, Application Audit, Windows App Development, Web Accessibility, Web Application Audit, Enterprise Software Development, IT Compliance Audit Web Analytics Report, Security Engineering, API Documentation, Web Analytics Software, API Blueprint GDPR Compliance Review, PCI, Compliance Testing, API Testing, Web Analytics Bug Fix, API Framework, Back-End Development Framework, NodeJS Framework, Compliance Consultation Innovation Strategy, AI Compliance, Web API, Security Analysis, Data Integration, GDPR, Security Infrastructure, Web App Localization, Web Accessibility, PCI DSS, Security Assessment & Testing Compliance, Security Framework, IT Infrastructure, IT Consultation, Database Integration, Database Administration, Database Development, Back-End Development, REST API, Web Service RESTful API, Infrastructure as Code, API Integration, API, Software Architecture & Design, Database Design, Database Architecture, Database Maintenance,Requirements Specification Database, Data Access Layer, Mobile App Redesign, Mobile App Testing, Mobile App Bug Fix, Mobile App Localization, Mobile App Development Consultation, AI Mobile App Development, Landing Page Front-End Development, Web Application, Responsive Design, Website, Agile Software Development UI Animation, Website Redesign, Page Speed Optimization, Ecommerce Website, Blog, Google Chrome Extension, Cloud Development, Cloud Infrastructure, Cloud Optimization, AWS Solutions, Google Cloud Platform (GCP), Microsoft Azure, Serverless Architecture, Scalability, Cost Efficiency, Cloud Security, DevOps Practices, Infrastructure as Code (IaC), Multi-Cloud Strategy, Cloud Migration, Performance Tuning, Disaster Recovery, Cloud-Native Applications, Kubernetes Management, Load Balancing, Virtualization, Cloud Monitoring and Analytics, Hybrid Cloud Solutions, High Availability Systems, Containerization, Data Backup and Recovery, Compliance and Governance, Front-End Development, Website, Responsive Design, ReactJS, Next.JS, TypeScript, HTML5, CSS3, SCSS, SASS, Bootstrap, Material-UI, Webpack, Ant Design, Angular2+, JavaScript, Tailwind CSS, GraphQL, Redux, React Bootstrap, Website Redesign, Web Application, Ecommerce Website, Figma, Performance Optimization, UX/UI Design, Back-End Development, Mobile App Development, MERN stack, MongoDB, Express.js, React.js, Node.js, Nest.js, Next.js, React Native [iOS, Android], API design, SQL, PostgreSQL, Amazon Web Services, DynamoDB, S3, EC2, Expo, App Center
.wrk
Associated with
.wrk
$6M+
earned
Aleksander K.
$32/hr
$10K+ earned
Available now
Start of list.
End of list.
Slow, hard-to-scale web apps and messy Front-End blocking growth? I build fast, scalable systems with clean architecture, no unnecessary complexity. I’m a Senior TypeScript/Next.js engineer with 10 years experience. I've shipped fast, scalable, accessible web applications with TypeScript, Next.js and React . I’ve built 25+ full-stack applications, 50+ high-performance Landing Pages, and 5+ scalable SaaS platforms. I can act as a Front End Architect and Tech Lead. I design clean component architectures, robust state management, and reliable API integrations that scale. My work spans event/ticketing platforms, real-time crypto dashboards, secure enterprise admin panels, and full-stack SaaS (NestJS + GraphQL + PostgreSQL). I care about accessibility, performance optimization, and maintainability. 🚀 𝗞𝗲𝘆 𝗔𝗰𝗵𝗶𝗲𝘃𝗲𝗺𝗲𝗻𝘁𝘀 • Mentored 15+ junior developers into strong TypeScript & frontend engineers • Led 8 Web Development teams (Agile / Scrum / Kanban) delivering complex Web Applications on time • Built secure CRMs, SaaS platforms with advanced dashboards, and Mobile Applications (React Native for iOS & Android) • Reduced front-end load times ~40% via code splitting, lazy loading, performance optimization (Lighthouse) • Improved development velocity ~30% with modular design patterns, scalable architectures (Turborepo + Vite) • Increased SaaS user engagement ~25% through UI/UX improvements, responsive design, design-system consistency • Delivered landing pages with 95+ Lighthouse performance scores 🎯 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 𝗜 𝗼𝗳𝗳𝗲𝗿 - Front End development with TypeScript, Next.js, React, JavaScript (ES6+) - Design systems & component libraries: shadcn/ui, Radix UI, Tailwind CSS, styled-components, vanilla-extract, CSS Modules - API-driven applications: REST, GraphQL (Apollo Client), OpenAPI/Swagger, Axios; auth, RBAC, JWT, OAuth; form-heavy UIs (React Hook Form + Yup/Zod) - Dashboards & real-time experiences: WebSockets, data visualization (ECharts), streaming state, pagination & caching - Performance & refactoring: bundle splitting, lazy loading, route-level code splitting, Lighthouse audits, RUM - Architecture: monorepos (Turborepo), Vite (React SWC), Webpack, OpenAPI Generator, CI/CD (GitHub Actions) - QA & reliability: Playwright, unit tests, linting/formatting (ESLint, Prettier), conventional commits 🏆 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸 - Front end: TypeScript, Next.js, React, JavaScript (ES6+), Redux, Redux Toolkit, Redux-Saga, React Context, Jotai, TanStack Query, TanStack Router - UI & Styling: Tailwind CSS, styled-components, CSS 3, HTML5, shadcn/ui, Radix UI, vanilla-extract, Responsive Design, Accessibility (react-aria-components), theming - Forms & Data: React Hook Form, Yup, Zod, Axios, ECharts, Data Visualization best practices - APIs & real-time: REST, OpenAPI/Swagger, GraphQL (Apollo), WebSockets - Back end & Database: Node.js, NestJS, Express, PostgreSQL, Prisma, MongoDB, MERN exposure - Tooling: Vite, Turborepo, Webpack, ESLint, Prettier, Docker, GitHub Actions, OpenAPI Generator, monorepo workflows - Testing: Playwright, unit/integration - Deployment & Observability: Vercel, Microsoft Application Insights, logging/monitoring hooks - Mobile: React Native (iOS/Android), Flutter 🛠️ 𝗪𝗵𝘆 𝘁𝗲𝗮𝗺𝘀 𝗵𝗶𝗿𝗲 𝗺𝗲 • Speed without debt: typed APIs, clean boundaries, maintainable state (Redux Toolkit/Jotai/TanStack Query) • Design-system mindset: focus/keyboard patterns, ARIA, theming, RTL, consistent tokens • Handover: docs, CI/CD, lint/format rules, sensible folder conventions, 💬 𝗘𝗻𝗴𝗮𝗴𝗲𝗺𝗲𝗻𝘁 𝗺𝗼𝗱𝗲𝗹𝘀 • Fixed-scope MVPs with clear milestones & demos • Part-time augmentation (frontend lead, feature owner) • Audits & refactors (TypeScript migration, state cleanup, performance hardening) 📩 Have a spec, API, or Figma? Share it and I’ll send a mini plan (architecture, milestones, first shippable increment) and a clear fixed price for the initial slice. 🔍 𝗞𝗲𝘆𝘄𝗼𝗿𝗱 𝗯𝗹𝗼𝗰𝗸 Front-End Development, Front-End Developer, Front-End Architect, Senior TypeScript Developer, Remote TypeScript Developer, TypeScript, Next.js Developer, Full Stack Developer, Web Developer, UI Developer, React Developer, Next.js, JavaScript Developer, React, Next.js, React Native, Vue.js, JavaScript, ES6, Redux, Redux Toolkit, Redux Saga, Zustand, Jotai, TanStack Query, TanStack Router, HTML5, CSS 3, SCSS, SASS, CSS Modules, Styled Components, Tailwind CSS, Material UI, shadcn/ui, Radix UI, vanilla-extract, UI, UX, UI/UX Design, Accessibility, ARIA, WCAG, Cross-Browser Compatibility, Framer Motion, Node.js, Express.js, NestJS, REST, REST API, API Integration, GraphQL, Apollo Client, WebSockets, MERN Stack, Full-Stack Development, PostgreSQL, SQL, MongoDB, Prisma, Firebase, Supabase, Authentication, Authorization, RBAC, JWT, OAuth, Security, Vite, Webpack, Turborepo, Nx, Monorepo, npm, Yarn, ESLint, Storybook, Chromatic, Jest
YOUR R&D™
Associated with
YOUR R&D™
$100K+
earned
$18/hr
94% Job Success
$50K+ earned
Available now
Offers consultations
Start of list.
End of list.
🚀 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 - 𝘁𝗵𝗲 𝘁𝗼𝗽 5% 𝗼𝗳 𝘁𝗮𝗹𝗲𝗻𝘁 𝗶𝗻 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 🔥 ABOUT ME I’m a Senior Full Stack Developer React Node and Next.js developer with 6+ years (12,000+ hours), building 40+ SaaS Platform, SaaS MVP, and Marketplace Platform products across 60+ clients as fullstack developer. As a Full Stack Developer React Node, I work across Frontend React and mobile app developer roles, delivering 50+ Web App Development, Web Application, and react native systems. I’ve repeatedly worked as a Next js developer and Full Stack Developer React Node, owning full lifecycle from Build MVP to Production-ready platform. I’ve built 25+ frontend systems as a React Developer and nextjs developer using Frontend React, while also working as a react native developer creating cross-platform mobile solutions. As a node.js developer, I design API Integration Architecture and Data Platform pipelines handling 3M+ API requests/month. Across 20+ systems, as Full Stack Developer React Node I delivered Client Portal, User Login, Admin Dashboard, shopify, and Analytics Dashboard solutions supporting 15,000+ users. I’ve used Supabase and Next.js Vercel as Frontend React in 25+ projects to build Multi-tenant SaaS and Scalable SaaS Platform systems with 99.9% uptime. 6+ years as a React Developer and delivering 60+ SaaS Platform, MVP, and Scalable SaaS Platform solutions. 70+ projects as a Frontend React Developer, including 30+ Web App builds, 15+ Next.js tailwind systems, and 10+ react native mobile app developer launches. 20+ products built as a Full Stack Developer React Node generating significant revenue across CRM Platform, Data Platform, and B2B Platform. 25,000+ active users across Web Platform and mobile systems built by a Frontend React Developer and Full Stack Developer React Node. 🔥 ACHIEVEMENTS Built 30+ SaaS Platform and Web Platform systems as a Full Stack Developer React Node and Nextjs developer, supporting 20,000+ users with 99.9% uptime using react.js node.js. Delivered 20+ projects as a Frontend React Developer and react native developer, reducing time-to-market by 35% using nextjs typescript and tailwindcss. Built API Integration and backend pipelines as a Full Stack Developer React Node, processing 5M+ API requests/month across Analytics Dashboard and Business Platform systems. Developed 10+ next.js seo optimized platforms as a React Developer, handling high-traffic volumes using mern stack and nextjs tailwind. Scaled 15+ Marketplace Platform and E-commerce Platform systems as a Full Stack React Developer, supporting shopify web developer tasks and Stripe integrations. Improved 15+ legacy systems as a Full Stack Developer React Node, achieving 2–3x performance gains and 40% fewer bugs as a front end web developer. Delivered 10+ Mobile App systems as a react native developer, serving thousands of users and coordinating with ux ui teams for react web development. 🔥 TECH STACK As a React Developer and Full Stack Developer React Node, I’ve worked across 40+ projects building scalable web applications using react.js and react redux, including 15+ high-load systems, while also delivering 10+ cross-platform solutions with react native as a react native mobile app developer reaching 30K+ installs. Throughout my experience, I’ve taken on roles as a react js developer and next js developer in distributed teams, including setups like react developers ethiopia, and contributed to 20+ backend-heavy systems as a node.js developer and full stack developer node js, handling data pipelines and logic. I’ve been involved in 20+ projects across diverse ecosystems, from wordpress developer environments to modern stacks using next.js developer workflows, and tools like strapi, svelte, and webflow, adapting to different business requirements. On the backend, I’ve worked as full stack developer node js, backend node.js, across 30+ systems, building services on node.js aws infrastructure and integrating with firebase, postgresql, and supabase postgres, supporting applications with 10K+ users. On the frontend side, I’ve taken roles including front end developer react, frontend react developer, and nextjs developer, delivering 40+ UI systems with complex workflows and high-performance interfaces using JavaScript developer and typescript. 🔥 WHAT CLIENTS GET A Full Stack Developer React Node and Nextjs Developer with 6+ years and 60+ projects, delivering 30+ Production-ready Platforms. As a Full Stack React Developer and react native developer, I focus on scalable architecture, clean code, and long-term growth for products with 10,000+ users. Strong experience as a React Developer, node.js developer, and backend developer across 40+ systems ensures reliable delivery aligned with business goals. 🚀 Click "Invite" or "Hire" Full Stack Developer React Node
Mohammed Azhar M. has worked .
3Brain Technolabs Private Limited
Associated with
3Brain Technolabs Private Limited
$20K+
earned
Rohan J.
$25/hr
100% Job Success
$600K+ earned
Available now
Offers consultations
Start of list.
End of list.
Hey! Invite me as your AI colleague and I will help you find where AI can save time, reduce cost, and create measurable ROI in your business. 🌟 Senior Full Stack and AI Engineer for SaaS, AI Agents, Automation 🚀 Scaled platforms to 1 Million+ users 💰 Supported $1 Million and $0.5 Million funded startups 💯 100% client satisfaction 🤝 90% recurring clients 🏆 12+ years of professional experience ⭐ 26,732 plus Upwork hours delivered 🔥 $600K+ plus earned through long term client work ✨ 81 plus five star projects completed I use modern workflows and AI coding tools to move up to 5x faster while still reviewing architecture, security, data flow, and code quality manually. Speed matters, but reliability matters more. Built MVPs for startups with $12 Million+ funding raised and products serving 1.5 Million+ users worldwide. 🔥 𝟳𝟱% 𝗛𝗥 𝗿𝗲𝗱𝘂𝗰𝗲𝗱 with AI Agent Development. 🔥 𝟯-𝟲𝘅 𝗥𝗢𝗜. 𝟴𝟬𝟬+ 𝗵𝗼𝘂𝗿𝘀 n8n Automation. Over 12 years I've delivered $670K+ across Web Development, Web Application, and AI Agent Development engagements in FinTech, HealthTech, PropTech, and B2B SaaS. My clients have collectively raised $12 Million+ in funding: 🔥 Tallyfy ($1.4M), MetaBeta (€500K) 🔥 Elevatus ($10.5M) 🔥 scaled to 1 Million+ active users. I am a full stack developer and AI developer with 12 years of experience building production systems across FinTech, HealthTech, PropTech, and B2B SaaS. My clients have raised $12M+ in funding including Tallyfy ($1.4M), MetaBeta (€500K), and Elevatus ($10.5M), and scaled products to 1.5 Million+ active users worldwide. Over 12 years I have delivered $670K+ across web development, web application, and AI agent development engagements with 90% recurring clients and 100% satisfaction. ✅ 12+ years | $670K+ delivered | 1.5M+ users scaled | $12M+ client funding raised ✅ AI agent development: 75% HR reduction, 3-6x ROI, 800+ hours of n8n automation ✅ Full stack development: 40+ production systems across FinTech, HealthTech, PropTech, SaaS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Key results from recent engagements: ▸ Reduced a client's HR overhead by 75% using a Python and LangChain AI agent that replaced 3 full-time employees with a 24/7 autonomous sales system ▸ Built API integration pipelines unifying 12 platforms simultaneously and processing 500+ daily NLP queries ▸ n8n automation across 30 active marketing workflows drove a 40% increase in lead generation ▸ AI chatbot and AI app development solutions returning 3-6x ROI within the first 90 days ▸ PostgreSQL optimizations delivering 3x query performance improvements across high-traffic applications ▸ German tax-filing SaaS processing 36 Million+ declarations on Laravel and PostgreSQL ▸ HIPAA-compliant healthcare platform on Node.js, React, and TypeScript ▸ PropTech portal on Next.js, FastAPI, and PostgreSQL handling 100+ search parameters ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 𝗔𝗜 𝗔𝗴𝗲𝗻𝘁 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ AI agent development is my primary engineering focus. I design and build full agentic pipelines using Python, LangChain, and machine learning, from RAG-powered vector retrieval and knowledge graphs through to voice AI bots and autonomous multi-agent orchestration. Every AI agent system I deliver applies prompt engineering discipline and data science principles for domain accuracy. I treat AI development as a full-stack business transformation, not a feature addition. I layer API integration, API development, and RESTful API surfaces over FastAPI, Django, and Node.js backends, then deliver them through React, Vue.js, and Next.js frontends. Every AI agent development system I architect applies data science and prompt engineering for domain accuracy. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 𝗙𝘂𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ I build backend systems on PHP, Laravel, Django, FastAPI, Node.js, NestJS, ExpressJS, and Ruby on Rails. Frontend interfaces are built with React, Vue.js, Next.js, Angular, TypeScript, JavaScript, HTML5, CSS3, and Tailwind CSS. Databases are PostgreSQL, MySQL, and MongoDB. Deployments run on Docker and AWS. I have delivered 40+ production full stack systems across every major vertical. API integration, API development, HTML5, and RESTful API connectivity are non-negotiable standards in every full stack project I lead. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 𝗪𝗲𝗯 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻 & 𝗪𝗲𝗯 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ I have built web application and web development systems across every major vertical. React and Next.js frontends pair with PHP, Laravel, and Node.js backends grounded on PostgreSQL, MySQL, and MongoDB. I bring CSS3, HTML5, Tailwind CSS, TypeScript, and automation engineering precision to every interface. Every system I deliver is production-grade, documented, and built to scale. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Rohan J. has worked .
Slavik C.
$65/hr
100% Job Success
$400K+ earned
Available now
Offers consultations
Start of list.
End of list.
✳️Top 1% Expert-Vetted | 140+ Completed Projects with 100% Success Rate | Clear and Pragmatic Communication I'm a Full Stack Developer and Back End Developer specializing in EdTech & SaaS Development, RAG systems, and production-ready web applications. 🟢I help founders build revenue-ready software in 2–3 months. My team provides full-cycle product delivery, including design, testing, and deployment. We hold a 100% success score across 18,000+ hours and 140+ projects. I'm a Full Stack Developer and AI Developer specializing in EdTech SaaS, RAG systems, and production-ready LLM-powered applications. As a SaaS Developer, Web Developer, WordPress Developer, and Backend Developer, I focus on platforms built for long-term growth - not throwaway prototypes - with LLM-driven features that are reliable, observable, and cost-controlled. What I Built as a Full Stack Developer, SaaS Developer and AI Developer 💡 EdTech SaaS — Adaptive SAT/ACT prep platform built with Stanford PhDs, featuring personalized learning paths and real-time student analytics. (Full Stack Developer | EdTech Developer) 💡 Enterprise RAG — SharePoint/Dynamics 365 RAG system indexing 300k+ docs for automated SOW drafting and research. (AI Developer | RAG Developer) 💡 Film Industry Search — Hybrid semantic search engine over 500k+ movie/TV scripts using dense vector indexing and keyword-aware reranking. (RAG Developer | Backend Developer) 💡 Voice POS — React Native voice-controlled POS for drive-thru grocery systems with real-time inventory sync. (Full Stack Developer | Mobile Developer) 💡 HealthTech / Fitness AI Development — Fitness platform using hybrid RAG and computer vision for sub-1.2s calorie tracking and workout generation. (AI Developer | Full Stack Developer) 💡Zendesk AI Copilot: Built an Azure OpenAI RAG pipeline for Zendesk, auto-drafting agent replies grounded in historical tickets and KB docs with PII anonymization before processing. (Full Stack Developer / Back End Developer) 💡HealthTech AI Scribe / HIPAA: Whisper + GPT-4o transcription pipeline for psychiatrists, auto-generating structured session notes with patient history, MSE, and treatment plans from live audio. (Full Stack Developer / Back End Developer) Tech Stack I work with: 🔹My AI and RAG development work covers OpenAI, ChatGPT, Anthropic, Claude, Gemini, Mistral, Llama, LangChain, Hugging Face, PyTorch, and Grok xAI — delivering production-grade Generative AI and RAG systems across industries. For Voice AI, I work with ElevenLabs, Whisper (STT/TTS), VAPI, and OpenAI's real-time audio APIs. 🔹As a Full Stack Developer, my core stack is React.js, Node.js, Next.js, TypeScript, and JavaScript (ES6+), with Python, Vue.js, PHP, HTML, CSS3, and Bootstrap across projects. 🔹On the backend, I build with Node.js, Python, Golang, and Java, using Laravel, REST APIs, background jobs, and async workflows depending on what the system needs. 🔹For mobile, I develop cross-platform iOS and Android applications using React Native, Swift, and Kotlin. 🔹CMS work runs on WordPress Development. 🔹For Cloud infrastructure I use Microsoft Azure, Google Cloud Platform (GCP), SharePoint, DigitalOcean, and Microsoft 365. 🔹My database experience covers PostgreSQL, MongoDB, MySQL, ElasticSearch, Redis, and Supabase. 🔹For communication integrations, I work with Twilio, RingCentral, Zoom, WhatsApp, Telegram, Gmail, and Outlook. 🔹DevOps and delivery relies on Git and solid software architecture and design practices throughout. 🔹On compliance, I build to HIPAA, GDPR, PCI-DSS, SOC 2, FERPA, and COPPA standards — critical for HealthTech, EdTech, and enterprise SaaS platforms handling sensitive data. How I work I take on projects as a Full Stack Developer and SaaS Developer where the technical decisions actually matter - platforms that need to scale, handle real data, and stay compliant. As a Web Developer and JavaScript Developer, I'm hands-on in the codebase. As a SaaS Developer and EdTech Developer, I think beyond features and focus on architecture, user workflows, and long-term maintainability. Working together I'll dig into the strategy behind the code and highlight the pitfalls in your plan to ensure we build the right version of your product the first time. 👉Message me to discuss your project and see if we’re a fit.
Slavik C. has worked .
Daisy V.
$40/hr
100% Job Success
$2M+ earned
Available now
Offers consultations
Start of list.
End of list.
About Me I have 10+ years of experience in Project Management of Mobile App Development, specializing in Android, iOS, & Cross-Platform App Development using Java, Kotlin, Swift, Objective C, React Native Mobile, Redux Flutter, Firebase, Mongo Db, User Authentication, EHR, FHIR, HL7, HIPAA compliance, Typescripts, and AI-driven applications. My expertise spans iOS & Android development, AI-powered solutions, seamless authentication systems, and full-stack capabilities, ensuring modern, high-performance apps for businesses of all sizes. Our Agency Since July 2017, my husband, our talented 55+ team members, and I have been delivering world-class digital solutions. - 150+ apps successfully delivered across multiple platforms in the last year - $4M+ turnover on Upwork - 500+ successful projects, 15,000+ hours worked - Close to a 100% success rate - Worked with 7, 8, and 9-figure businesses Our Expertise Mobile App Development • Android, iOS, & Cross-Platform Apps (Java, Kotlin, Swift, Objective C, React Native Mobile, Flutter) Web & Full Stack Development • Front-End: React.js, Angular.js, Next.js, WebRTC • Back-End: Node.js, Firebase, MongoDB, PostgreSQL • Cloud Deployment & API Integrations E-commerce & CMS Development • Shopify Developer & Customization • WordPress Developer & WooCommerce Solutions UI/UX Design & Branding • Adobe XD, Figma, Photoshop, Sketch Digital Growth & Security • SEO & Digital Marketing Optimization • Data Security & Intellectual Property Protection Intellectual Property Services • Trademark & Copyright Assistance Why Choose SolidAppMaker? - Tailored Approach: Every project is customized to fit your needs and budget. - Agile Workflow: Regular updates, milestones, and transparent communication. - High-Quality Development: Rigorous testing & performance optimization. - Competitive Pricing: Top-tier services at fair and transparent pricing. - Proven Track Record: Experience with MVPs, SaaS platforms, AI-driven apps, and enterprise solutions. Why SolidAppMaker Stands Out - 8+ years of expertise in UI/UX, mobile apps, SaaS & web development - 510+ projects successfully completed for startups & enterprises - 10+ awards & recognitions, featured on Upwork & top design platforms - 20+ countries served, delivering top-tier prototyping & development solutions Industries We Cover Healthcare, Transport, Retail, Asset Management, Real Estate, Dating, Nature/Wildlife, Rental, Food Delivery, Fintech / Finance and Banking, Cryptocurrency, Entertainment, Hospitality, Logistics, Manufacturing, Media and Publishing, Non-Profit, Sports and Fitness, Travel and Tourism, Utilities, Wellness, Medical Dashboard, Marketplace, Advertising, Automotive, Business Innovations, Ecology, Human Resources, LegalTech, Lifestyle, Fashion, Marketing, Navigation, Education, E-learning. Highlighted Skills Project Planning, MVC Architecture and RESTful APIs, Front-end Technologies (React.js, HTML5, CSS3, JavaScript), Responsive and Mobile-first Design, Database Design and Implementation (MongoDB, Firebase), User Authentication, Integration of Third-party APIs, Deployment to Cloud Platforms (AWS), Test-driven Development, Agile Methodologies (Scrum, Kanban), Security Technologies, QR Code Scanner, GPS and Mapping, Blockchain and NFT, ChatGPT and Artificial Intelligence. React Native Mobile Developer 10+ years of experience As a Mobile App Developer and Full Stack Developer with deep expertise in SaaS Mobile App, React Native Mobile App I bring over a decade of experience in building high-performance cross-platform mobile application. As a talented React Native Mobile Developer with good knowledge of cross-platform development, I specialize in crafting high-performance mobile apps for both iOS and Android platforms. I made more than 400 apps using React Native Mobile. Reactnative Mobile is my main tech stack, making top-performing apps using React Native Mobile. IOSDeveloper AndroidDevelop As a mobile app developer and full stack developer, I specialize in building robust cross-platform solutions using Flutter, React Native Mobile, and Expo for rapid development. My projects often leverage Firebase for secure real-time data storage and user authentication, and I have hands-on experience integrating WebRTC for live video and audio communication inside mobile apps. On the backend, I frequently use Laravel to build scalable APIs and admin panels that perfectly support mobileapp solutions. ReactNative Next Steps – Let’s Build Something Amazing! 📅 Would you be available for a 30-60 minute free consultation? During this meeting, we will: - Go over your project goals, technical needs, and budget. - Provide a project plan with a timeline and cost estimate. - Discuss the best development approach to fit your vision. - Send me a message, and I’ll share the Upwork scheduler link so we can set up a time that works best for you. Looking forward to collaborating and creating something extraordinary! Best regards, Daisy VC
Daisy V. has worked .
SolidAppMaker LLC
Associated with
SolidAppMaker LLC
$1M+
earned
Anton C.
$35/hr
98% Job Success
$400K+ earned
Available now
Offers consultations
Start of list.
End of list.
🚀 Specializes in React, Next.js, and Node.js with a strong focus on production-ready SaaS, multi-tenant B2B platforms, and AI-powered web applications. ⭐ Top Rated Plus 📅 6+ years of experience 📦 70+ projects delivered ⏱️ 5,000+ Upwork hours 🔁 ~70% returning clients Over 6 years of full-stack experience building fast, scalable, and secure web applications from MVP to production scale — a proven track record of reliable, high-quality delivery for startups, founders, agencies, SaaS companies, and growing businesses. 🏢 Multi-tenant SaaS & B2B platforms Strong background in multi-tenant SaaS and B2B platforms: secure, role-based systems with custom workflow logic, OWASP-compliant authentication, RBAC, and full Stripe billing (Checkout, Subscriptions, and Connect) — built to scale reliably, reduce manual operations work, and keep subscription billing accurate. This aligns well with SaaS, dashboard, admin panel, and B2B platform projects. 🤖 AI-powered products Experienced in AI-powered products: RAG pipelines, embeddings, semantic search, and prompt engineering with the OpenAI and Anthropic APIs. I build AI SaaS, chatbots, and automation tools with real-time features, streaming responses, and offline-ready PWAs — designed to lower response latency and improve reliability for end users. A strong fit for AI SaaS, automation, and integration projects. 🛒 Web apps, marketplaces & e-commerce I build two-sided marketplaces, e-commerce platforms, booking and scheduling systems, real-time chat and messaging, analytics dashboards, internal tools, and landing pages. Comfortable with complex features like authentication flows, payment processing, real-time data handling, and third-party API integrations. ⚡ Next.js, performance & SEO Deep experience with the Next.js App Router, Server Components, SSR, SSG, and ISR, plus API routes and middleware — builds that typically improve SEO, reduce time-to-interactive, and deliver faster load times. I optimize for Core Web Vitals, accessibility, and responsive, cross-browser interfaces — so your product ranks well and feels fast on every device. 🔌 Integrations & features I implement OAuth and SSO, webhooks, payment gateways (Stripe and PayPal), Google APIs, calendar, email and SMS (SendGrid, Resend, Twilio), file uploads, PDF generation and exports, charts and data visualization, advanced search and filtering, notifications, and workflow automation with Zapier and Make. 🛠️ Tech stack Proficient in React, React.js, Next.js, Node.js, TypeScript, and JavaScript. Skilled in Express, NestJS, REST and GraphQL APIs, tRPC, Prisma and Drizzle, PostgreSQL, Supabase, PlanetScale, and Neon. Frontend with HTML5, CSS3, SCSS, Tailwind CSS, Styled-Components, Shadcn/ui, Framer Motion, and GSAP; state and data with Redux, Zustand, React Hook Form, Zod, and TanStack Query. Cloud and DevOps on AWS (Lambda, S3, EC2, RDS, Cognito), Google Cloud Platform, Azure, Vercel, and Netlify, with CI/CD via GitHub Actions. Testing with Jest, Vitest, and Playwright; monitoring with Sentry; headless CMS with Sanity, Storyblok, Payload, and Contentful. I also build cross-platform mobile apps with React Native and Expo. 🔧 Beyond my core stack Having worked across many different codebases, I'm also comfortable with and have worked with Python, PHP, Laravel, MySQL, MongoDB, Redis, WordPress, Java, FastAPI, jQuery, Gatsby.js, Remotion, and Web3 — so if your existing project mixes stacks, I can pick things up quickly, take over inherited code, and keep everything moving. 🎯 What clients hire me for Clients hire me for scalable web applications, secure REST and GraphQL APIs, high-performance Next.js front-ends, clean and modern UI, responsive and intuitive dashboards, and reliable, production-ready SaaS — all built with maintainable, well-architected, and thoroughly tested code. I work across industries including SaaS, B2B, fintech, e-commerce, healthtech, ed-tech, real estate, and online marketplaces, building everything from MVPs and internal tools to full-scale, multi-tenant products. 🤝 How I work You get a reliable senior developer who reads the brief carefully, asks the right questions, and communicates clearly. I recommend a pragmatic, scalable approach and ship clean, well-tested, production-ready code with strong ownership of performance, security, and maintainability — treating every web application, SaaS dashboard, or platform as something worth building properly. 💡 Whether you need a new product built from scratch, a rescue of an existing codebase, or a long-term development partner, I'm here to help. Open to both fixed-scope MVPs and long-term product work. Let's discuss your project — happy to walk through relevant work and a recommended approach on a quick call. 👇 react developer, react.js developer, next.js developer, node.js developer, full-stack developer, react web app, saas developer, b2b saas, ai saas developer, stripe integration, typescript, web application development
Anton C. has worked .
UI UX design agency with Full-Stack development expertise
Associated with
UI UX design agency with Full-Stack development expertise
$300K+
earned
Muneeb A.
$28/hr
100% Job Success
$400K+ earned
Available now
Offers consultations
Start of list.
End of list.
🥇 Top Rated Senior Full Stack Developer ⭐ 5-Star Ratings | ✅ Verifiable projects | ❇️ 6,000+ Hours | 100% refund if I set the wrong expectation and can’t deliver. No questions asked! I help startups and SaaS companies build fast, scalable, and reliable software. Whether you're a small business, nonprofit, or growing startup, I’ve worked with teams of all sizes to turn ideas into solid, high-performing applications. I bring both technical and strategic value. I can help you select the right technology stack, design scaleable systems, manage the product from start to finish, build and lead strong dev teams, and forecast timelines and keep budgets on track. Whether it's kicking off a brand-new project, fixing one that's gone off track, or scaling to support millions of users, my past experience has equipped me for your challenge. I proficiently utilize AI tools such as Cursor, GitHub Copilot etc to increase productivity and improve development. **Expertise includes: AI Automations: n8n Automation – Custom workflow design, API integrations and process optimization. Back-End: - Python: Django, FastAPI, Flask - Javascript: Next.js, Node.js, Nest.js, Express.js Front-End: - HTML, CSS, Tailwind, Bootstrap - Javascript: React, Next.js Angular, Vue.js, Grape.js - API Integration: REST, GraphQL, SOAP, MCP Databases: - MySQL, PostgreSQL, MongoDB, SQLite, Cassandra, MariaDB, Google BigQuery, Neo4j - Payment Gateways Integration: Stripe, PayPal, 2Checkout, Braintree, etc. - Server Setup & DevOps: Amazon Web Services Heroku Google Cloud Console Setting up CI/CD pipelines Industries I've worked with: 🔸 AI SaaS | Marketing Tech | Healthcare | eCommerce | Fintech | Customer Support | Real Estate 2024 onwards helping startups integration AI and develop efficient cost effective Generative AI solutions. - Implementing RAG - AI Agents or Chatbot Development - Finetuning LLMs - Reinforcement Learning from Human Feedback (RLHF) - Vector Databases Efficient data handling for AI and machine learning.
ESketchers
Associated with
ESketchers
$25/hr
100% Job Success
$1K+ earned
Available now
Start of list.
End of list.
Experienced Full Stack Developer with main focus on Laravel. Open for new challenges and dynamic projects. Experienced with all stages of the development cycle for dynamic web projects. Well-versed in numerous programming languages. Speaking Macedonian, English, Serbian, Croatian and Bulgarian Strong background in HR, and project management. Well organized, self-motivated individual offering creative, complex and well structured designs.
Dimitar V. has worked .