Hey there! 👋 I'm Devansh, a Full Stack Developer with 6+ years of experience building scalable web and mobile applications. As a Full Stack Developer, I specialize in Angular, React, .NET Core, and Node.js delivering fast, production-ready solutions that scale. I'm a Full Stack Developer who handles frontend, backend, database, and cloud, so you work with one Full Stack Developer, not an entire team. Whether you're launching a new product or upgrading an existing system, I'm the Full Stack Developer who takes it from start to finish. 🚀 ⭐ Top Rated Full Stack Developer 🏆 100% Job Success Score ✅ 5+ Years of Full Stack Developer Experience 🏆 5.00 ★★★★★ Client Feedback ✅ 1000+ Billed Hours 𝐖𝐡𝐚𝐭 𝐈 𝐁𝐮𝐢𝐥𝐝 𝐟𝐨𝐫 𝐘𝐨𝐮: ➡️ 𝐂𝐮𝐬𝐭𝐨𝐦 𝐖𝐞𝐛 𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬 Full Stack Developer delivering end-to-end development from front-end to back-end, fast, secure, and tailored to your unique business needs. ➡️ 𝐒𝐚𝐚𝐒 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦𝐬 I build multi-tenant architecture and admin dashboards as your dedicated Full Stack Developer, shipping complete SaaS products end-to-end, not just individual features. ➡️ 𝐌𝐨𝐝𝐞𝐫𝐧 𝐅𝐫𝐨𝐧𝐭-𝐄𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Clean, responsive UIs using Angular, React, and TypeScript for seamless user experiences that your users will actually enjoy, built by a Full Stack Developer. ➡️ 𝐒𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐁𝐚𝐜𝐤-𝐄𝐧𝐝 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 Full Stack Developer building robust, scalable back-end systems with C#, .NET Core, Node.js, and NestJS, designed to handle real traffic and grow with your business. ➡️ 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 𝐃𝐞𝐬𝐢𝐠𝐧 & 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭 Secure, optimized database solutions using MSSQL, PostgreSQL, and MongoDB, designed and managed by a Full Stack Developer. ➡️ 𝐂𝐥𝐨𝐮𝐝 𝐃𝐞𝐩𝐥𝐨𝐲𝐦𝐞𝐧𝐭 I deliver reliable deployments on Azure, AWS, and DigitalOcean with CI/CD pipelines and Docker as a Full Stack Developer who owns the entire cloud setup. ➡️ 𝐀𝐏𝐈 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 & 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬 Full Stack Developer specializing in RESTful and GraphQL API development and third-party integrations for seamless system communication across web, mobile, 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞: ✅ 𝐅𝐮𝐥𝐥 𝐎𝐰𝐧𝐞𝐫𝐬𝐡𝐢𝐩 I handle frontend, backend, database, and cloud ✅ 𝐂𝐥𝐢𝐞𝐧𝐭-𝐅𝐨𝐜𝐮𝐬𝐞𝐝 Solutions aligned with your business goals, not just specs ✅ 𝐂𝐥𝐞𝐚𝐧 𝐂𝐨𝐝𝐞 Maintainable, scalable code that's easy to build on ✅ 𝐒𝐡𝐢𝐩𝐬 𝐅𝐚𝐬𝐭 MVPs and features delivered on aggressive timelines ✅ 𝐂𝐥𝐞𝐚𝐫 𝐂𝐨𝐦𝐦𝐮𝐧𝐢𝐜𝐚𝐭𝐢𝐨𝐧 Regular updates in plain English, no tech jargon ✅ 𝐋𝐨𝐧𝐠-𝐓𝐞𝐫𝐦 𝐒𝐮𝐩𝐩𝐨𝐫𝐭 I stay after launch to ensure continued success 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤: ⚡ 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 → Angular, React, Redux, TypeScript, RxJS, Tailwind CSS, Bootstrap, MUI, Ant Design ⚡ 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 → C#, .NET Core, ASP.NET, Node.js, NestJS, RESTful APIs, GraphQL ⚡ 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 → MSSQL, MySQL, PostgreSQL, MongoDB ⚡ 𝐂𝐥𝐨𝐮𝐝 → Azure, AWS, DigitalOcean, Docker, CI/CD ⚡ 𝐒𝐭𝐚𝐜𝐤𝐬 → MERN Stack, MEAN Stack, PERN Stack ⚡ 𝐕𝐞𝐫𝐬𝐢𝐨𝐧 𝐂𝐨𝐧𝐭𝐫𝐨𝐥 → GitHub, Bitbucket, Azure DevOps 𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐓𝐨𝐨𝐥𝐬: ➤ Cursor, Cline, GitHub Copilot, Claude Code ➤ ChatGPT, v0.dev, Bolt.new ➤ Replit Ghostwriter, Codeium, Tabnine ➤ n8n, Zapier, Make (Integromat) ➤ MCP Servers & AI Agent Integrations 𝐖𝐡𝐚𝐭 𝐘𝐨𝐮'𝐥𝐥 𝐆𝐞𝐭: ✔️ A production-ready, custom solution built around your business goals ✔️ Seamless, modern UI with responsive design your users will love ✔️ Secure and scalable back-end built to handle real traffic ✔️ Post-launch support so nothing breaks after you go live ✔️ Complete end-to-end ownership from first line of code to deployment 🌟 𝐋𝐞𝐭'𝐬 𝐁𝐮𝐢𝐥𝐝 𝐒𝐨𝐦𝐞𝐭𝐡𝐢𝐧𝐠 𝐀𝐦𝐚𝐳𝐢𝐧𝐠 🌟 I'm passionate about helping businesses grow through technology. Every project I take on reflects my commitment to excellence from architecture to deployment. Ready to work with a reliable, experienced developer? Let's build something that lasts. 📩 Send me a message or invite me to your project. Let's talk. 🚀 Full Stack Developer | Full Stack Developer React Node | Full Stack Developer .NET | Full Stack Developer Angular | Full Stack Developer Node.js | Full Stack Developer MERN | Full Stack Developer MEAN | Full Stack Developer SaaS | Full Stack Developer API | Full Stack Developer Cloud | MERN Stack Developer | MEAN Stack Developer | Angular Developer | React Developer | Node.js Developer | Next.js Developer | .NET Developer | .NET Core Developer | Full Stack SaaS Developer | SaaS Application Development | Multi-Tenant SaaS | Web Application Full Stack Developer | API Full Stack Developer | REST API Developer | GraphQL Developer | Backend Developer | NestJS Developer | Azure Developer | AWS Developer | DevOps | Docker | CI/CD | Web Developer

I am a professional Full Stack Developer and Web Application Specialist with 7+ years of experience building scalable, high-performance, and AI-powered web applications tailored to business needs. I specialize in developing custom web apps and SaaS platforms from scratch focusing on clean architecture, seamless user experience, and future-ready solutions. From idea validation and prototyping to full production deployment, I help businesses turn concepts into powerful digital products. 🚀 Core Expertise: Custom Web Applications & AI Solutions Custom Web Application Development (End-to-End) SaaS Platform Development & Scaling AI-Powered Web Applications (GPT-based systems) Workflow Automation using AI Smart Recommendation Systems API Development & Third-Party Integrations Scalable Backend Architectures 💻 Full Stack Development Skills Backend: PHP (Laravel, CodeIgniter) MySQL, MongoDB, Firebase Frontend: HTML5, CSS3, Bootstrap JavaScript, jQuery Angular, ReactJS, VueJS 🤖 AI & Modern Tech Integration AI Chatbots & Virtual Assistants AI Content Generation Tools Custom AI Features for SaaS Products Automation Systems to improve efficiency AI API integrations (OpenAI & others) 🎨 UI/UX & Frontend Excellence User-Centered UI/UX Design Responsive & Mobile-First Development Pixel-Perfect Implementation Tools: Figma, Balsamiq, InVision, Adobe Suite ⚙️ Additional Experience Shopify Development (5+ years) WordPress (Custom solutions when needed, not generic builds) GitHub, Bitbucket (Version Control) Agile Tools: Jira, Trello, Slack, Asana

📌 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝗲𝗱 𝘀𝘂𝗰𝗰𝗲𝘀𝘀𝗳𝘂𝗹 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝗳𝗼𝗿 𝗨𝗡𝗜𝗟𝗘𝗩𝗘𝗥, 𝗗𝗢𝗩𝗘 𝗮𝗻𝗱 𝗗𝗛𝗟. My clients get high-performance, SEO-optimized digital products and 📊 𝘂𝗽 𝘁𝗼 30% 𝗹𝗼𝘄𝗲𝗿 𝗶𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲 𝗰𝗼𝘀𝘁𝘀. Glad to build yours next! 📍 Client-oriented Full Stack Developer (React Node, React Next.js, MERN Stack) 📍 Headless CMS expert (Strapi, Payload, Sanity, Contentful, Storyblok, Directus, Prismic etc). 📍 MSc in Computer Science 📍 13+ years in the field 📍 Thinking like a product owner, not just a coder 📍 My clients turn into long-term partners 🚫 No short-term gigs, quick fixes, or rush jobs please 𝗖𝗟𝗜𝗖𝗞 𝗠𝗘𝗦𝗦𝗔𝗚𝗘 to get a detailed project review 📩 𝗠𝘆 𝗴𝗼𝗮𝗹 𝗶𝘀 𝘀𝗶𝗺𝗽𝗹𝗲: build fast, scalable and maintainable products that support your business growth, while respecting your timelines and budget. 🎯 Need an expert Full stack React developer, Nextjs developer, or Full Stack developer React Node for SEO-ready products? I’ve worked as a full stack react developer with react.js since its early days - before official SEO and server-side rendering existed. I built custom SSR pipelines as a Frontend React developer to make react.js apps SEO-friendly and blazing fast. Today, as an experienced Full stack React developer and Next.js developer, I deliver instant indexing, strong Core Web Vitals, and fast Time-to-Interactive. My expertise includes SEO engineering - schema, automated sitemaps, pre-rendering, lazy hydration, and incremental regeneration - powered by next.js and react.js, strong frontend react developer expertise 𝗧𝗘𝗖𝗛𝗡𝗢𝗟𝗢𝗚𝗜𝗘𝗦 𝗜 𝗨𝗦𝗘 ➡️ REACT NEXT.JS Next.js and react.js are my go-to tools as a full stack developer React Node for hybrid rendering, ISR, and fast performance - as for a Full stack React developer working with headless CMS like Strapi cms, Payload, Sanity and CDN caching. I also work as a Frontend React developer and Front end developer when the project needs precise UI implementation. - Astro cms - Next.js - Gatsby - TypeScript ➡️ JAMSTACK & STATIC SITE DEVELOPMENT I use the most efficient frameworks for your needs: Astro / Gatsby / Qwik / Hugo / 11ty / Jekyll / Zola / Remix / SvelteKit / Next / Nuxt / Docusaurus / Docusify / MkDocs / Slate / Sphinx / GitBook. ➡️ HEADLESS CMS DEVELOPER Self-hosted / Open-source: Strapi, Directus, Payload CMS, KeystoneJS, Ghost Git-based / Static-site friendly: Decap CMS, TinaCMS API-first SaaS: Sanity, Contentful, Contentstack, Kontent.ai, DatoCMS, Agility CMS, Hygraph Visual Builders: Storyblok, Prismic, Builder io, ButterCMS, Cosmic CMS I integrate headless CMS with next.js and react.js frontends as a Frontend React developer using live previews, API hooks, and on-demand revalidation. Many of my platforms are built with react nextjs, react typescript, Headless cms, and Full Stack Developer React Node architecture. ➡️ NODE.JS & CLOUD BACK-END As a full stack developer React Node I work end-to-end, handling API and backend setups that power react.js next.js node.js apps: Frameworks: NestJS, Supabase, Firebase, Clerk Databases: PostgreSQL, MongoDB Queues & Caching: Redis, Apache Kafka Serverless & Search: AWS Lambda, Elasticsearch I build full stack developer React Node Next.js platforms with next.js supabase integrations and scalable node.js services, using Next.js API routes and serverless backends ➡️ INFRASTRUCTURE & DEPLOYMENT Vercel / Netlify / Strapi Cloud AWS Amplify / AWS Lambda Railway / Render AWS / OVH Cloud / Azure I ensure your next.js and frontend react apps are always stable and and easily scalable If you’re looking for a reliable Full Stack React developer, Frontend React expert, Nextjs developer, Frontend React developer, or Full Stack Developer React Node to build scalable and SEO-optimized platforms, happy to help! 𝗗𝗢𝗠𝗔𝗜𝗡𝗦 & 𝗣𝗥𝗢𝗗𝗨𝗖𝗧𝗦 𝗜 𝗕𝗨𝗜𝗟𝗗 SaaS platforms, eCommerce, B2B dashboards, marketing & corporate websites, marketplaces, booking platforms, fintech dashboards, MERN Stack products, Headless CMS projects. My React, Next.js, Node.js and Headless CMS projects focus on measurable outcomes: 30–50% faster page load, 40%+ smaller JS bundle, 3–5x faster API response, 2–3x faster content publishing, up to 30% lower infra costs. 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 𝘄𝗲 𝗯𝗿𝗶𝗻𝗴 𝘁𝗼 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀: Full Stack developer React Node expertise, Frontend React developer, Front end developer support, Full stack React developer stack, Full Stack Developer React Node, Frontend React developer, Full Stack developer, Headless CMS developer, Next.js, Nextjs developer, Astro CMS, TypeScript, Node.js developer, NestJS, PostgreSQL, MongoDB, MERN, MERN Stack, Redis, Strapi CMS, Payload CMS, Sanity, Directus, Supabase, Firebase, AWS, Vercel, Docker, AEM / Adobe Experience Manager, along with web & mobile design & QA. 𝗠𝗘𝗦𝗦𝗔𝗚𝗘 𝗺𝗲 "𝗗𝗥𝗬" and get a detailed expert consultation on your project idea 📩

Helping startups and SaaS companies build scalable AI powered products with modern full stack technologies and production ready architecture. With proven experience delivering high quality applications for startups businesses and enterprise platforms I specialize in building fast scalable and user focused products using Next.js React Node.js Python and AI integrations 𝐌𝐲 𝐜𝐨𝐫𝐞 𝐞𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 𝐢𝐧𝐜𝐥𝐮𝐝𝐞𝐬: • AI SaaS Development • Full Stack Web Applications • OpenAI and Claude API Integrations • AI Automation Systems • SaaS Dashboards and Admin Panels • Marketplace and Booking Platforms • FinTech and Analytics Platforms • REST API and GraphQL Development • Third Party API Integrations • React Native Mobile Apps 𝐈’𝐯𝐞 𝐰𝐨𝐫𝐤𝐞𝐝 𝐨𝐧 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬 𝐢𝐧𝐯𝐨𝐥𝐯𝐢𝐧𝐠: • AI powered content and automation systems • GPT and Claude based workflows • Enterprise SaaS platforms • FinTech dashboards and analytics • Real time booking systems • Mobile applications for iOS and Android 𝐑𝐞𝐜𝐞𝐧𝐭 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬 𝐢𝐧𝐜𝐥𝐮𝐝𝐞: • Scripty AI advanced AI screenplay platform with GPT integrations autosave export systems analytics and cloud infrastructure • Detext.ai AI SaaS platform for content image video and code detection with subscriptions and admin systems • Seretii AI powered idea generation and project planning platform using LLM APIs • Vid2U AI content generation platform for videos images speech and branding assets • Okani Travels full stack booking platform with Amadeus APIs dashboards analytics and payment integrations 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 Next.js React.js Node.js TypeScript Python MongoDB PostgreSQL Tailwind CSS Firebase REST APIs GraphQL OpenAI APIs Claude APIs AWS Lambda Stripe 𝐀𝐈 𝐀𝐬𝐬𝐢𝐬𝐭𝐞𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐖𝐨𝐫𝐤𝐟𝐥𝐨𝐰 I actively use modern AI assisted engineering tools and workflows including Claude Code Cursor OpenAI Codex GitHub Copilot Windsurf ChatGPT v0 and Anti Gravity to speed up development improve code quality streamline debugging accelerate testing and deliver scalable products faster 𝐖𝐡𝐚𝐭 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐜𝐚𝐧 𝐞𝐱𝐩𝐞𝐜𝐭: ✔ Scalable architecture ✔ Fast responsive frontend systems ✔ Secure backend development ✔ AI powered workflows and integrations ✔ SEO friendly applications ✔ Clean maintainable code ✔ Production ready deployments ✔ Reliable communication and collaboration If you’re building an AI SaaS platform modern dashboard marketplace or full stack application and need someone who can handle both product quality and scalable engineering I’d be happy to help bring it to life

🎁 Bonuses from us: • 𝗙𝗿𝗲𝗲 𝗽𝗿𝗼𝘁𝗼𝘁𝘆𝗽𝗲 before development starts • 𝟯 𝗺𝗼𝗻𝘁𝗵𝘀 support after delivery I have the experience and skills to launch complex projects. Clients worldwide hire me to develop 𝗰𝘂𝘀𝘁𝗼𝗺 websites and applications with complex back-end systems. I work on a wide range of projects, including 𝗖𝗥𝗠s, 𝗘𝗥𝗣s, client portals, eLearning platforms, eCommerce systems, healthcare solutions (EHR/EMR), and TMS. 🛠️ Tech Stack: PHP, Laravel, Yii2, Node.js, React, Vue, AWS, MySQL, PostgreSQL, Redis, Docker — delivering secure, scalable, and user-focused solutions. Interested in working together?

👋 Hi, I'm Julia from Koitechs - Top Rated Plus Upwork team focused on React, Next.js, Node.js, React Native, TypeScript, Supabase, PostgreSQL, and AI product development. My main goal is save up to 40% of our budget to get a market-ready, stable and scalable product. I help companies hire in-house, CTO-approved engineers who join fast, take ownership, and deliver production-ready software. ✅ 9+ years in software development ✅ 155+ web and mobile projects delivered ✅ 20,500+ Upwork hours in React / Next.js / Node.js / React Native ✅ 75% repeat clients ✅ Engineer matching in 24 hours or less ✅ 2-week trial period ✅ 35+ in-house engineers ✅ 40+ MVPs released ✅ Products supported by our team include platforms with 5M+ daily users 🚀 React / Next.js / Full Stack We build SaaS platforms, marketplaces, dashboards, admin panels, CRMs, AI products, and scalable web apps using React, Next.js, Node.js, TypeScript, Supabase, PostgreSQL, Firebase, MongoDB, REST API, GraphQL, Stripe, OAuth, WebSockets, AWS, Vercel, and Docker. Our team is a strong fit if you need a react developer , web developer , full stack developer , nextjs developer, mern developer, or backend engineer. We help with MVP development, legacy code takeover, architecture modernization, Core Web Vitals, API integrations, payments, auth, subscriptions, user roles, and production launch. 📱 React Native / Mobile We build and support iOS and Android apps using React Native, Expo, Firebase, Supabase, Node.js, and API-driven architecture. We can help if you need a react native developer , mobile app developer, iOS / Android support, app takeover, mobile maintenance, push notifications, App Store / Google Play releases, payments, or backend integrations. We also support mixed mobile environments with flutter developer , android developer , backend developer, AI developer, or web developer. 🤖 AI SaaS / AI App Development We build AI-powered products connected to real business workflows. Experience: AI SaaS, AI MVPs, AI chatbot development, AI agent development, OpenAI API, Claude API, LLM prompt engineering, RAG, automation, web scraping, AI model integration, copilots, and AI workflow validation. AI stack: OpenAI API, Claude API, LLMs, RAG, AI Agent Development, AI Chatbot, Generative AI, Python, FastAPI, Supabase, PostgreSQL, pgvector, automation, data analysis, web scraping. 🧩 Mixed-Stack Support Our core focus is React, Next.js, Node.js, React Native, TypeScript, Supabase, and AI. We also support products involving wordpress , vue , angular , python developer , scala developer , flutter developer , android developer , mern , and other web/mobile technologies. 🏆 Industries 📦 Logistics - 5+ projects: tracking, shipment dashboards, carrier/shipper workflows, maps, route visibility. 🏥 HealthTech -4+ projects: medical booking, clinic platforms, patient flows, admin systems. 🛒 Marketplaces & E-commerce - 15+ projects: multi-vendor products, Stripe, subscriptions, bidding, complex search. 🏠 PropTech / Real Estate -5+ projects: listings, booking flows, agent dashboards, rental platforms. 🤖 AI Startups - 25+ AI products/features: AI SaaS, chatbots, agents, copilots, OpenAI / Claude integrations. 💰 FinTech - 3+ projects: Stripe Connect, billing, payment flows, invoicing. 🎮 Gaming - 5+ projects, including 2 major global gaming brands: dashboards, analytics, real-time interactions. 📚 EdTech - 5+ projects: student dashboards, progress tracking, content platforms. 📣 MarTech - 1 global market-leading project: dashboards, analytics, segmentation, workflows. ⚽ SportsTech - 10+ projects: live data, dashboards, events, rankings, stats, mobile apps. 📌 How We Work 1️⃣ Discovery & technical planning 2️⃣ Engineer matching within 24h 3️⃣ 2-week trial period 4️⃣ Weekly demos and reports 5️⃣ CTO-approved delivery with code review and QA 6️⃣ Long-term support after launch 🚀 Building a SaaS, MVP, marketplace, React app, Next.js platform, React Native app, AI product, or mixed-stack web/mobile platform? Click “Invite” or “Hire” - I’ll help you clear the estimate or discovery phase within 24 hours or less.

✅ 𝗧𝗼𝗽 𝟭% on Upwork 🏆 𝐄𝐱𝐩𝐞𝐫𝐭 𝐯𝐞𝐭𝐭𝐞𝐝 🏆 ✅ 100+ Jobs ✅ 5000+ hours ✅ 100% Job Success ✅ 98% Clients Recommend ✅ 15+ years shipping production software ✅ Cost Effective ✅ Verified Fluent English I help startups and SMBs ship fast, reliable web and mobile products that drive leads, revenue and time savings. I combine modern stacks with AI and workflow automation so you get better results with fewer headaches. ►►Why hire me? - Attention to details, best practices and production ready code - On time delivery with weekly checkpoints and clear scope - Outcome based plans with measurable targets (speed, conversions and ops time saved) - Proactive communication and minimal revision workflow ✅ Mobile App Development: - React Native, Flutter for iOS/Android, Hybrid - Shared codebases, native modules when needed and store submissions ✅ Web App Development - React, Node, Next.js and TypeScript - API first architecture, auth, role based access, caching, Socket-io and testing ✅ Websites that convert - WordPress and Webflow builds and revamps - Custom themes and Plugins, WooCommerce and Headless WP - Core Web Vitals, accessibility (WCAG), SEO and CRO fixes ✅ Generative AI Integration - Integrate Generative AI into your existing application - Integrate OpenAI, Gemini, OpenRouter, HuggingFace and Anthropic APIs in your existing workflow to automate system! ✅ Automation & AI Agent - n8n, Zapier and Make, serverless tasks - OpenAI API chatbots and assistants, lead qualification, content and reporting pipelines - CRM, GA4, email and Slack integrations that cut busywork ✅ Databases - MySQL, MongoDB, PostgreSQL, Redis and Firebase ✅ Infrastructure & Tools - AWS, DigitalOcean, Firebase, CI/CD, Github/GitLab/Bitbucket, Jira, Trello and ClickUp ✅ Bonus expertise (on request) - Payments, subscriptions and analytics pipelines - Crypto integrations (ERC 20, BEP 20) when relevant to business goals ✅ Recent wins - WordPress service site revamp: +40% form submissions in 60 days - Next.js SaaS MVP with subscriptions delivered in 6 weeks - AI support assistant deflecting ~30% repetitive tickets and faster first response ✅ What you can expect - Clear estimates, transparent milestones and maintainable code - Performance budgets to keep pages fast and infra costs sane - Post launch support that prevents regressions ✅ Quick start options - 30 minute consultation to roadmap your MVP or redesign - WordPress speed and Core Web Vitals audit with prioritized fixes - Automation sprint to connect forms, CRM, email and analytics If you want a partner who ships fast, communicates clearly and focuses on measurable outcomes, let’s map your first milestone.

Full Stack Developer | 5M software End-Users Impacted | $200K+ Total Earnings | Expert-Vetted (Top 1% Upwork) | 26 Projects | 100% Job Success | 12+ Years on Upwork | 5339+ Hours Worked | TOP RATED PLUS – Top 3% of companies | 15+ Countries Covered 🙈 “Can we just quickly fix this?” 🙊 “It’s probably just a small change.” 🙉 “Let’s ship first and think later.” I am a CEO and Business Manager at Peppernode. I help create systems where architecture matters, decisions matter, and the cost of mistakes is higher than the cost of doing it right. Call me Illia. ✅ Full Stack Developer React ✅ React Developer ✅ React Native Developer ✅ React Native Mobile Developer ✅ Python Developer ✅ Front end Developer ✅ Mobile App Developer ✅ SaaS Developer With 12+ years of experience, I specialize in building scalable SaaS platforms, high-performance mobile applications, and production systems designed for long-term growth. I work as a React Full Stack Developer, React Native App Developer, React Developer, and Python Developer, helping startups and established businesses transform ideas into reliable products that scale. Over the years, I've delivered 31 successful projects for clients across 15+ countries, building products that now serve more than 5 million software end-users worldwide. As an Expert-Vetted professional with 100% Job Success, $200K+ 🏆 Why Clients Choose Me As a Full Stack Developer React with 31 successful projects delivered across 15+ countries, I've helped build products now serving more than 5 million end-users worldwide. With 100% Job Success, $200K+ earned, and 5,339+ hours worked on Upwork, I bring proven experience designing scalable applications, validating product strategies, and helping businesses make the right technical decisions from day one. 🚀 SaaS Product Development I build modern SaaS platforms as a Full Stack Developer React using React, Python, Firebase, scalable architecture built to scale. I work as a React Developer Firebase specialist delivering connected experiences across frontend and backend systems. My experience includes architecture planning, MVP development, frontend/backend implementation, payment integrations, and product evolution. 📱 React Native App Development As a React Native Developer and React Native App Developer, I build cross-platform applications delivering consistent experiences across iOS and Android. As a React Developer and Mobile App Developer, I deliver React Native Mobile solutions built for reliability and performance. As a react native developer expo specialist, I move products from MVP to production while maintaining a high-quality user experience. My experience includes mobile app development react native projects for startups and businesses requiring speed, flexibility, and long-term scalability. My work includes React Native and Expo development, feature delivery as a full stack developer react native, mobile MVPs and enterprise applications, API integrations, App Store and Google Play releases, performance optimization, product support. I have experience as a node js react native mobile developer building connected mobile ecosystems powered by scalable backend services. 🍽 Restaurant Ordering Systems I have experience developing restaurant ordering solutions serving thousands of daily users, with a strong focus on reliability, operational efficiency, and seamless customer experiences. Several included React Native Mobile experiences for customers and operational teams. These systems require solid architecture and stable integrations. 📌 Existing Product Modernization Many teams come to me after moving too fast. As a Front End Developer React and Full Stack Developer React, I improve existing applications through refactoring unstable codebases, optimizing performance bottlenecks, introducing scalable architecture, reducing technical debt, and expanding functionality without sacrificing maintainability. 🤖 AI Integrations & Automation I work as a Full Stack Developer AI building solutions with OpenAI API, Gemini, LangChain, Copilot, and modern AI workflows to create intelligent product experiences, including AI-powered features, chat interfaces, workflow automation, knowledge retrieval, and productivity enhancements. 🔧 Workflow & Tech Stack Discovery and planning begin with business analysis, technical discovery, architecture decisions, and product strategy. Frontend technologies include React, React Native, Expo, TypeScript, JS, HTML5, CSS. Backend development is built with Python, FastAPI, Django, Node.js, REST APIs, GraphQL, PostgreSQL, MySQL, Firebase, Stripe integrations. As a Python Full Stack Developer Flask specialist, I focus on maintainable systems, integrations, and architectures designed for long-term evolution. 🚀 Need a Web Developer, React Developer, React Native Developer, Full Stack Developer React Node or Python Full Stack Developer who thinks beyond code and builds products designed to scale? Let’s talk.

I help AI SaaS companies ship production features faster using Claude Code, Cursor, OpenAI, Python, FastAPI, Next.js, React, and PostgreSQL. If you need a developer who can work inside an existing codebase, use AI tools responsibly, review AI-generated diffs, and ship clean production code, I can help. Recent relevant work: • Built the frontend and core AI backend for an early-stage SaaS product using Claude API, multi-round tool execution, SSE streaming, prompt caching, and third-party OAuth integrations. • Shipped 14,400+ lines in 6 weeks as the sole frontend engineer while working across AI workflows, activation pipelines, API integrations, and production UX. • Built Quellit AI, an AI-powered testing platform using OpenAI and CrewAI agents. • Built AI voice calling and appointment automation systems for businesses using voice APIs, backend workflows, and dashboard-based configuration. • Developed backend systems with Python, FastAPI, Flask, PostgreSQL, MongoDB, Docker, AWS/GCP, REST APIs, and webhooks. What I can help with: • AI SaaS feature development • Claude Code / Cursor-assisted engineering • OpenAI, Claude API, and LLM workflow integration • AI agents, tool-calling, prompt caching, and streaming responses • Python backend APIs with FastAPI, Flask, Django, and PostgreSQL • React, Next.js, TypeScript, and frontend dashboards • OAuth integrations, API sync, webhooks, and automation pipelines • Refactoring, debugging, test coverage, and production deployment How I work: I scope before building, communicate proactively, write maintainable code, document decisions, and validate AI-generated code before shipping it. I am comfortable joining existing teams, working under CTO-level direction, and using Cursor, Claude Code, GitHub, Linear/Jira, Docker, and cloud workflows to deliver quickly without lowering engineering standards. If you are building an AI SaaS product, AI agent, automation tool, or production web app, send me a message and I’ll help you turn it into a clean technical plan.

🏆 𝗔𝗜-𝗙𝗶𝗿𝘀𝘁 𝗠𝗼𝗯𝗶𝗹𝗲 & 𝗪𝗲𝗯 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 | 🔝𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝗣𝗹𝘂𝘀 | 𝟭𝟬𝟬% 𝗝𝗼𝗯 𝗦𝘂𝗰𝗰𝗲𝘀𝘀 𝐒𝐜𝐨𝐫𝐞 | $𝟏𝟎𝟎𝐊+ 𝗘𝗮𝗿𝗻𝗲𝗱 𝟮,𝟰𝟯𝟯+ 𝗵𝗼𝘂𝗿𝘀. 𝟭𝟳+ production-scale mobile apps and web platforms delivered. Portfolio includes 𝗔&𝗝 𝗦𝗰𝗵𝗼𝗼𝗹 / 𝗞𝗲𝗻𝗺𝗲𝗶, an LMS built for a UK online school recognized as 𝗣𝗿𝗶𝗻𝗰𝗲 𝗖𝗵𝗮𝗿𝗹𝗲𝘀 𝗦𝗰𝗵𝗼𝗼𝗹 𝗼𝗳 𝘁𝗵𝗲 𝗬𝗲𝗮𝗿 𝟮𝟬𝟮𝟰, plus 𝗦𝗮𝗸𝗸𝗮𝗿 𝗔𝗜, a healthcare assistant powered by 𝟭.𝟰𝗠 𝗣𝘂𝗯𝗠𝗲𝗱 articles. I build mobile apps and web platforms that launch cleanly, scale beyond MVP, and don’t need to be rebuilt after the first serious user growth. 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲, 𝗙𝗹𝘂𝘁𝘁𝗲𝗿, 𝗡𝗲𝘅𝘁.𝗷𝘀, and 𝗥𝗲𝗮𝗰𝘁.𝗷𝘀 products with backend APIs, AI features, admin dashboards, payments, databases, and cloud deployment included. ⚡ 𝗜’𝗺 𝗮 𝗴𝗿𝗲𝗮𝘁 𝗳𝗶𝘁 𝗶𝗳 𝘆𝗼𝘂’𝗿𝗲 𝘁𝗵𝗶𝗻𝗸𝗶𝗻𝗴: ☑️ “I need a 𝗙𝗹𝘂𝘁𝘁𝗲𝗿 or 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲 mobile app developer who can take full ownership” ☑️ “I need a 𝗡𝗲𝘅𝘁.𝗷𝘀 or 𝗥𝗲𝗮𝗰𝘁.𝗷𝘀 web app built properly from frontend to backend” ☑️ “I want an 𝗔𝗜-powered app, chatbot, dashboard, or SaaS product” ☑️ “I need a production-ready 𝗠𝗩𝗣 in weeks, not months” ☑️ “My app needs a backend, admin dashboard, database, or web portal” ☑️ “I want clean, documented code, not a messy build I’ll need to replace later” ☑️ “I need someone reliable who communicates clearly and keeps the project moving” 📱 𝗠𝗼𝗯𝗶𝗹𝗲 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 I build cross-platform mobile apps for 𝗶𝗢𝗦 and 𝗔𝗻𝗱𝗿𝗼𝗶𝗱 using 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲 and 𝗙𝗹𝘂𝘁𝘁𝗲𝗿. This includes authentication, onboarding, dashboards, payments, subscriptions, chat, notifications, maps, calendars, scheduling, media workflows, AI assistants, API integrations, and App Store / Play Store deployment. Relevant portfolio includes 𝗕𝘂𝘀𝗺𝗶𝗴𝗼, a Flutter school commute and driver-student transport app; 𝗕𝘂𝗱𝗴𝗲𝘁𝗕𝗮𝗲, a React Native AI personal finance and budgeting app; 𝗦𝗮𝗸𝗸𝗮𝗿 𝗔𝗜, a healthcare AI diabetes assistant; 𝗙𝘂𝗿𝗿𝘃𝗶, a pet video editing and media management app; and 𝗗𝗼𝗴𝗴𝗲𝗹, an EdTech content publishing app. 🌐 𝗪𝗲𝗯 𝗔𝗽𝗽𝘀, 𝗦𝗮𝗮𝗦 & 𝗗𝗮𝘀𝗵𝗯𝗼𝗮𝗿𝗱𝘀 I build scalable web applications using 𝗡𝗲𝘅𝘁.𝗷𝘀, 𝗥𝗲𝗮𝗰𝘁.𝗷𝘀, 𝗧𝗮𝗶𝗹𝘄𝗶𝗻𝗱 𝗖𝗦𝗦, 𝗡𝗼𝗱𝗲.𝗷𝘀, 𝗙𝗶𝗿𝗲𝗯𝗮𝘀𝗲, 𝗦𝘂𝗽𝗮𝗯𝗮𝘀𝗲, 𝗣𝗼𝘀𝘁𝗴𝗿𝗲𝗦𝗤𝗟, and cloud deployment. This includes SaaS platforms, admin panels, dashboards, CMS systems, marketplaces, portals, internal tools, payment flows, reporting systems, and custom business applications. Relevant portfolio includes 𝗔&𝗝 𝗦𝗰𝗵𝗼𝗼𝗹 / 𝗞𝗲𝗻𝗺𝗲𝗶, a custom LMS for online education; 𝗛𝘇𝗮𝗱 𝗘𝗱𝘂𝗰𝗮𝘁𝗶𝗼𝗻, a quiz and assessment platform; 𝗞𝗶𝘁𝗮𝗝𝗮𝗴𝗮, a community help platform with maps and donations; 𝗣𝗮𝘆𝟮𝗦𝗲𝗮𝗿𝗰𝗵, a web earning platform; and 𝗞𝗶𝗻𝘀𝗺𝗲𝗻 𝗖𝗼𝗻𝘀𝘂𝗹𝘁𝗶𝗻𝗴, a modern business website with custom tools. 🤖 𝗔𝗜 𝗔𝗽𝗽𝘀, 𝗖𝗵𝗮𝘁𝗯𝗼𝘁𝘀 & 𝗥𝗔𝗚 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 I develop AI-powered products using 𝗢𝗽𝗲𝗻𝗔𝗜, GPT models, embeddings, vector search, RAG pipelines, and structured backend workflows. I can build AI chatbots, document Q&A tools, healthcare assistants, finance copilots, recommendation systems, AI summaries, automation workflows, and AI-first SaaS platforms. 🛠️ 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸 ◉ 𝗠𝗼𝗯𝗶𝗹𝗲: React Native, Flutter, Expo, Dart, iOS, Android ◉ 𝗪𝗲𝗯: Next.js, React.js, TypeScript, Vue.js, Angular.js, JavaScript, Tailwind CSS ◉ 𝗔𝗜: OpenAI API, GPT, RAG, AI Chatbots, AI Agents, Embeddings ◉ 𝗕𝗮𝗰𝗸𝗲𝗻𝗱: Node.js, NestJS, Express.js, FastAPI, REST APIs, GraphQL ◉ 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀: PostgreSQL, Supabase, Firebase, MongoDB, MySQL, Redis ◉ 𝗖𝗹𝗼𝘂𝗱: AWS, Vercel, Google Cloud, Docker, CI/CD, DigitalOcean ◉ 𝗣𝗮𝘆𝗺𝗲𝗻𝘁𝘀: Stripe, PayPal, In-App Purchases, RevenueCat 🙋🏻‍♂️ 𝗪𝗵𝘆 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝗰𝗵𝗼𝗼𝘀𝗲 𝗺𝗲: ✅ 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝗣𝗹𝘂𝘀 with 𝟭𝟬𝟬% 𝗝𝗼𝗯 𝗦𝘂𝗰𝗰𝗲𝘀𝘀 ✅ $𝟏𝟎𝟎𝐊+ 𝗘𝗮𝗿𝗻𝗲𝗱 and 𝟮,𝟰𝟯𝟯+ 𝗵𝗼𝘂𝗿𝘀 on Upwork ✅ 𝟭𝟳+ production-scale mobile apps and web platforms delivered ✅ Full ownership across mobile app, web app, backend, dashboard, and deployment ✅ Strong experience across AI, SaaS, EdTech, HealthTech, FinTech, logistics, and transport ✅ Clean, documented code that can scale after the MVP stage ✅ Clear communication, structured delivery, and reliable execution 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀: FinTech · Healthcare · EdTech · AI Assistants · SaaS · Logistics · Transport · Fitness · E-commerce · Social Apps · Content Platforms · Marketplaces · Startup MVPs · Business Dashboards 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀: Mobile App Development · Web App Development · React Native Developer · Flutter Developer · Next.js Developer · React.js Developer · iOS App Development · Android App Development · Cross-Platform App Development · AI App Development · OpenAI API · RAG Developer · Full Stack Developer · Node.js Developer