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Full-Stack SaaS Developer building production B2B platforms where AI agents, Stripe billing, and multi-tenant architecture work together at scale. Top-Rated on Upwork · $30K+ delivered · 5+ years shipping SaaS, AI agent workflows, and payment infrastructure founders can scale without rebuilds. WHAT I BUILD End-to-end SaaS platforms — backend, frontend, AI agents, payments, infrastructure. Not a generalist who "also knows AI" or "also touches Stripe." A full-stack SaaS engineer whose AI and billing layers are the part most teams underbuild. → Custom AI agents for multi-step workflows — form completion, onboarding automation, decision flows, document-aware tasks → Multi-LLM integrations — OpenAI, Claude, and multi-model routing to control cost and latency → Multi-tenant SaaS architecture with proper data isolation, RBAC, and tenant-aware billing → Subscription platforms with Stripe Billing — plans, proration, dunning, usage-based metering for AI features → Marketplace platforms with Stripe Connect — Standard, Express, and Custom accounts, deferred onboarding, split payouts → Production webhook infrastructure — idempotency, retries, dead-letter queues, signature verification → Authentication, authorization, customer portals, and admin dashboards → API design (REST + tRPC) with rate limiting, auth, and proper error handling AI IN PRODUCTION SAAS AI features are now expected in B2B SaaS. I build them as core capabilities, not bolt-ons: → Custom multi-LLM agents that complete multi-step workflows (onboarding, form processing, customer support automation) → OpenAI and Claude API integrations with cost controls, retry logic, observability, and fallback handling → Multi-model routing — using the right LLM for each task (cheap models for classification, premium models for reasoning) → AI-powered customer service, document-aware chat, and workflow assistants → Usage tracking and metered billing for AI features — the Stripe Billing + AI metering integration most teams ship broken I'm a full-stack SaaS engineer who ships production AI features. I understand the business side — token costs, latency, fallbacks, prompt observability, and how to bill for AI usage correctly. PAYMENTS DEPTH The Stripe billing layer is where most AI SaaS products break quietly — subscriptions that don't update, metered events that miss invoices, webhook handlers that drop dispute events. I've shipped production payment systems across 7 gateways — Stripe (including Connect), PayPal, IxoPay, Dimoco, ACI Processing, emerchantpay, and PayBank2Bank. Real depth across subscription billing, usage-based metering, marketplace payouts, and webhook reliability. RECENT WORK → catalyst-payment-app (B2B SaaS) — Built custom multi-LLM agent for payments onboarding workflow automation. Multiple AI models routed for adaptive multi-step form completion. Stripe Connect with deferred KYC and multi-gateway fallback. → Inoqare (HealthTech SaaS) — Architected from zero. Multi-tenant healthcare platform serving 1,000+ patients with subscription billing and zero payment incidents in production. → Multi-step payment flow optimization (Marketplace) — Custom checkout retention flow that lifted payment conversion by 35%. → Gateway integration optimization — Diagnosed integration issues silently dropping conversions. +20% lift, pure infrastructure work. → Real-time SaaS platforms — Twilio-based chat, voice, and custom invoicing with integrated billing. INDUSTRIES AI SaaS · B2B SaaS · HealthTech · FinTech · Marketplaces · Subscription platforms · Workflow automation STACK Backend: Node.js · NestJS · Express · TypeScript · PostgreSQL · MongoDB Frontend: Next.js · React · Tailwind · shadcn/ui AI: OpenAI API · Claude API · Multi-model agents · LLM workflow integration · Prompt engineering Payments: Stripe (Connect, Billing, Tax) · PayPal · regional gateways Infrastructure: AWS · Vercel · Docker Real-time: Twilio · WebSockets HOW I WORK → Fixed price, fixed scope, fixed timeline — no surprise hourly bills → 50% upfront, 50% on delivery → Daily async updates (Slack, Loom, written) — async-first, calls only when essential → Clean code with tests, docs, and deployment instructions → NDA from day one WHO I WORK WITH BEST → AI SaaS founders building agent-based or LLM-powered products → B2B SaaS adding AI features that need to be metered and billed → Marketplace founders needing Stripe Connect done right → Existing SaaS with AI integration, billing, or webhook pain → Agencies needing a white-label AI + SaaS + payments specialist If your project involves building an AI SaaS, integrating AI agents, shipping Stripe billing, or fixing payment infrastructure — send me a brief. I'll respond within 24 hours with whether it's a fit.

★★ Full Stack Developer | SaaS & AI Solutions | Next.js, Node.js, Python, FastAPI, Supabase ★★ ★★ AI Solutions & Automation Specialist | RAG, LLM Integrations & SaaS Platforms ★★ ★★ 5+ Years of Proven Experience Building Scalable, High-Performance Web Products ★★ I’m a Full Stack Developer with over 5 years of experience, specializing in building scalable SaaS applications and AI-powered solutions using Next.js, Node.js, and FastAPI. 🧠 Tech Stack Expertise Frontend: React • Next.js • TypeScript • Streamlit • Redux • Tailwind CSS • Bootstrap • HTML • CSS Backend: Node.js • NestJS • FastAPI • Supabase • GraphQL • Redis • RabbitMQ • Bull Database: MongoDB • PostgreSQL • MySQL AI & Automation: Retrieval-Augmented Generation (RAG) • LLMs • LangChain • n8n • Zapier • AI Agents Deployment & DevOps: AWS • Google Cloud • Heroku • Vercel • DigitalOcean ⚙️ What I Deliver ✅ AI-Powered Applications & Chatbots (LLM + RAG Integration) ✅ E-Commerce Platforms & SaaS Applications ✅ Workflow Automation (n8n, Zapier, Custom AI Agents) ✅ CMS Development (Payload, Contentful, Strapi, Directus, Craft CMS) ✅ Responsive, SEO-Optimized Frontends ✅ Secure Authentication & API Integrations ✅ Payment Gateway Integration (Stripe, PayPal) ✅ Multi-Language Support ✅ Performance Optimization & Maintenance Let’s connect and discuss how I can bring your ideas to life with cutting-edge web and AI technology. Key Skills & Keywords (for Discoverability) Full Stack Developer | Senior Full Stack Developer | Full Stack Engineer | React Developer | React.js Expert | Next.js Developer | Node.js Developer | NestJS Developer | MERN Stack Developer | Backend Developer | Node.js Backend Engineer | React & Node.js Specialist | Full Stack Web Developer | SaaS Developer | Enterprise SaaS Developer | Admin Dashboard Developer | Role-Based Access Control (RBAC) | Analytics & Reporting Systems | Internal Workflow Automation | Cloud-Ready Applications | AWS Developer | Python Full Stack Developer | Scalable Web Applications | API Development | Modern Web Architecture

Looking for a developer who can build your SaaS MVP, CRM platform, enterprise dashboard, backend API, or business automation system from idea to production? I am a Full-Stack MERN Developer and JavaScript/TypeScript engineer with 8+ years of experience building scalable SaaS platforms, CRM systems, enterprise web applications, AI-powered business solutions, automation systems, and cloud-based software. I specialize in React, Next.js, TypeScript, Node.js, Express.js, NestJS, MongoDB, PostgreSQL, Supabase, Firebase, AWS, OpenAI API, Claude API, AI Agent integration, API development, payment integration, authentication, and cloud deployment. My focus is not just writing code—I build secure, scalable, maintainable, and production-ready software that solves real business problems and supports long-term growth. 🚀 How I can help you • End-to-end SaaS MVP development from idea to production • Custom CRM systems, admin panels, dashboards, and internal business platforms • Business automation, workflow automation, webhook automation, and API-driven solutions • Third-party API integrations including payment gateways, email services, analytics, and enterprise platforms • AI-powered applications using OpenAI, Claude, LLM integration, AI Assistants, AI Agents, and intelligent automation • Secure backend architecture with REST APIs, JWT Authentication, OAuth, RBAC, and scalable database design • Responsive frontend development with modern UI/UX and performance optimization • Cloud deployment, DevOps setup, CI/CD pipelines, and infrastructure optimization ⚡ Core Skill Set & Expertise Frontend Development I build modern, responsive, and high-performance web applications using React.js, Next.js, TypeScript, Redux, Zustand, Context API, Tailwind CSS, ShadCN UI, Material UI, HTML5, CSS3, SCSS, and modern frontend architecture. My focus is reusable components, SEO, SSR/SSG, accessibility, code splitting, lazy loading, and exceptional user experience. Backend Development I develop secure, scalable backend systems using Node.js, Express.js, NestJS, REST APIs, JWT Authentication, OAuth 2.0, RBAC (Role-Based Access Control), WebSockets, modular architecture, microservices, event-driven systems, and enterprise-grade backend solutions. Database & Cloud I design scalable database architecture using PostgreSQL, MongoDB, Firebase, and Supabase. I also manage production deployments on AWS, Vercel, and cloud infrastructure with CI/CD pipelines, monitoring, optimization, and performance tuning. AI Integration & Business Automation I build AI-powered software using OpenAI API, Claude API, LLM integration, AI Agents, AI Assistants, chatbot systems, intelligent search, document processing, workflow automation, reporting automation, lead automation, notification systems, CRM automation, and business process optimization. 🎯 Specialized Experience SaaS & MVP Development Scalable SaaS platforms, multi-tenant applications, MVPs, subscription-based software, enterprise portals, booking systems, and custom business platforms designed for long-term scalability. CRM & Business Dashboards Custom CRM solutions, analytics dashboards, reporting platforms, customer management systems, sales pipelines, and real-time operational dashboards. Enterprise Automation Workflow automation, business process automation, reporting systems, lead management, API integrations, notifications, approvals, and operational efficiency solutions. Healthcare, FinTech & Enterprise Platforms Healthcare SaaS, patient management systems, telemedicine platforms, financial software, payment processing, lending systems, ERP modules, and enterprise business applications. 💡 What makes me different • Business-focused software engineering approach • Clean, scalable, and maintainable architecture • Strong expertise in SaaS, CRM, AI, Automation, and Enterprise Software • Production-ready mindset with security, performance, and scalability as priorities • Clear communication and regular progress updates • Long-term partnership focused on sustainable software growth I enjoy working with clients who value quality engineering, scalable architecture, and software that delivers measurable business impact. Let's discuss your next SaaS platform, CRM system, AI-powered application, enterprise dashboard, automation solution, or custom full-stack software project. Core Technologies & Search Keywords MERN Stack, Full Stack Developer, SaaS Development, Multi-Tenant SaaS, Enterprise Software, CRM Development, MVP Development, React Developer, Next.js Developer, Node.js Developer, JavaScript, TypeScript, OpenAI API, Claude API, LLM Integration, AI Agent, AI Assistant, AI Integration, Business Automation, Workflow Automation, API Integration, REST API, JWT Authentication, OAuth, RBAC, PostgreSQL, MongoDB, Supabase, Firebase, AWS, Cloud Deployment, Dashboard Development, Admin Panel Development, Payment Integration, Real-Time App

I help businesses build fast, scalable web applications with Next.js and React that don't just work — they grow with your business. I'm a Full Stack Developer specializing in Next.js and the MERN stack, with over 4 years of experience building scalable, SEO-friendly, high-performance web applications. I help companies move from messy, hard-to-maintain codebases to clean, scalable architectures — and I bring specific domain depth in warehouse management, logistics, and courier/parcel systems, so if your project touches inventory, shipping, or operations workflows, I already speak that language. 𝐖𝐡𝐚𝐭 𝐈 𝐛𝐮𝐢𝐥𝐝: ✅ SaaS applications with multi-tenant architecture ✅ Custom dashboards, admin panels, and ERP/CRM systems ✅ SEO-optimized, high-performance Next.js websites and landing pages ✅ E-commerce storefronts with admin + CMS ✅ REST APIs, database design (PostgreSQL, MongoDB, Redis) and deployment (Docker, AWS, Vercel) 𝐓𝐞𝐜𝐡 𝐬𝐭𝐚𝐜𝐤: Next.js, React, TypeScript, Node.js, Express, NestJS, PostgreSQL, MongoDB, Prisma, Redis, Tailwind CSS, Docker, AWS, Vercel 𝐖𝐡𝐲 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐡𝐢𝐫𝐞 𝐦𝐞: ✅ Performance-first — strong Core Web Vitals and clean architecture by default ✅ Type-safe, maintainable code you (or the next dev) can build on ✅ Business-oriented — I ship solutions that drive growth, not just features ✅ Clear communication and reliable delivery (see my reviews below) Available to start immediately. Message me with a short description of your project and I'll reply with exactly how I'd approach it. Full Stack Developer | Next.js Developer | React Developer | Node.js Developer | TypeScript Developer | SaaS Developer | ERP Developer | CRM Developer | Full Stack Web Developer | Backend Developer | Frontend Developer | MERN Stack Developer | Web Application Developer | API Developer | Warehouse Management System | Logistics Software Developer

👋 Hey there! I’m Ismail Hosen A passionate Backend Architect with 6+ years of professional experience, transforming complex ideas into powerful, scalable, and elegant backend systems. 🚀 What I Bring to the Table Tech Stack Mastery • Node.js, NestJS, Express.js • TypeScript (daily driver), JavaScript • MongoDB, MySQL, PostgreSQL • RESTful & GraphQL APIs • Microservices, Modular Architecture, Monorepo • Docker, CI/CD, DevOps, Nginx, API Gateway, Load Balancing • Redis, RabbitMQ, Kafka • Socket.IO (Real-time Communication) • System Design, Clean Code, Scalability • OAuth2, JWT, RBAC, Secure Practices • Jest, Supertest, Swagger/OpenAPI, Postman • AWS, GCP, Vercel, DigitalOcean 💼 Why Work With Me ✔️ Not just a developer — an engineer who delivers outcomes ✔️ I build systems that scale, not code that breaks ✔️ Focused on long-term reliability, not just quick fixes ✔️ Business-aligned — I translate goals into clean architecture ✔️ Reliable, easy to work with, and highly communicative ✔️ Detail-oriented with a passion for clean, testable code ✔️ Engineering mindset combined with strong product thinking 💡 Let’s Turn Your Idea Into a Success Story Whether you're: • A founder building an MVP • A CTO scaling an ambitious platform • An agency needing a trusted backend specialist I’m here to architect your success. Let’s collaborate and build something exceptional together. 🤝 📬 Reach out now — I’m excited to bring your vision to life.

Hi there! I'm a passionate React Native Developer with a strong full-stack development background — helping you build powerful, scalable mobile apps that connect seamlessly with robust backends. Core Skills: Frontend: React Native, React.js, Redux, Context API, Expo, React Navigation Backend: Node.js, Express.js, NestJS Database: MongoDB, PostgreSQL, MySQL, Firebase, SQL DevOps & Tools: Docker, Firebase Other Expertise: JWT Authentication, Role-based Access, API Security, Push Notifications Whether you're launching a new app, improving an existing one, or need both frontend and backend support — I can help from concept to deployment. I focus on: Clean UI/UX with React Native Scalable backend APIs with Express/NestJS Real-time features like chat or notifications Optimized queries & secure databases (Mongo/PostgreSQL) End-to-end app architecture and deployment I believe in clear communication, on-time delivery, and writing clean, maintainable code. Let’s work together to build something impactful! Feel free to reach out — I’d love to hear about your project.