Mohammad Sabbir A.

𝟲𝟬+ successful projects | 𝟱+ 𝘆𝗲𝗮𝗿𝘀 building production-ready systems | 🥇𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 | Zero compromises on quality. You are reading the description of a 🥇𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 Full Stack Developer specializing in AI-powered SaaS platforms and custom web applications. I help businesses turn ideas into scalable products, from AI MVPs to enterprise applications and Agentic AI systems. I started as a full stack developer at an MNC company, where quality and deadlines mattered. Before coding, I document requirements, map architecture, model the database, and prototype the UI in Figma. This helps prevent costly rewrites and delays. 📊 PROVEN EXPERIENCE • Full Stack & AI Engineering (7+ years): Built 40+ SaaS platforms, MVPs, custom web apps, portals, and enterprise tools. • Agentic AI & Autonomous Workflows (2+ years): Designed 20+ AI agent systems using LangGraph and CrewAI, including tool-calling agents and multi-step workflows. • Frontend (React / Next.js): Developed responsive interfaces with TypeScript, Tailwind CSS, streaming LLM responses, and AI chat. • Backend & APIs (Python / Node.js): Engineered REST and GraphQL APIs, asynchronous workers, WebSockets, and scalable microservices. • RAG & Vector Databases: Built retrieval-augmented generation pipelines, semantic and hybrid search, and secure data access with pgvector, Pinecone, and Supabase RLS. • Cloud & DevOps: Deployed Docker-based applications and CI/CD pipelines across AWS, Vercel, and GCP. 💼 SELECTED PROJECTS 🔹 Agentic AI Operations System: Python, LangGraph, FastAPI, Next.js Built a multi-agent platform for market intelligence and lead qualification. Agents plan tasks, search the web, call APIs, evaluate outputs, and sync verified data to CRMs, saving 120+ hours of manual analysis per week. 🔹 Multi-Tenant AI SaaS with Agentic Copilot: Next.js, Node.js, PostgreSQL, OpenAI Built a B2B SaaS platform with an AI Copilot, tool calling, Stripe subscriptions, isolated workspaces, and custom analytics. It supports 40,000+ monthly active users with 99.95% uptime. 🔹 AI Prototype Rescue: Lovable, Claude Code, FastAPI, Supabase Turned a fragile AI-generated prototype into production-ready software. Secured API keys and user data, improved database security, optimized prompt caching to reduce OpenAI costs by 40%, and implemented automated CI/CD. 🔹 Enterprise RAG Knowledge Base: Python, pgvector, LangChain, Claude Built a RAG assistant for 100,000+ documents with hybrid retrieval and citations, reducing support response times by 50%. 🔹 AI-Powered Marketplace & Scheduling: React, TypeScript, Node.js Built a marketplace with an AI booking assistant, Google Calendar integration, Stripe Connect payments, and real-time WebSocket notifications. ⭐ CORE SERVICES • AI-powered SaaS and custom web application development • Full-stack development, MVPs, dashboards, and enterprise portals • Agentic AI, multi-agent systems, and workflow automation • OpenAI, Claude, Gemini, LLM, and RAG integration • AI prototype rescue and production hardening • CRM, ERP, marketplace, booking, and business management systems • API development, cloud infrastructure, security, and CI/CD 🛠 TECHNICAL STACK • AI & Agentic Frameworks: OpenAI, Anthropic Claude, LangChain, LangGraph, CrewAI, AutoGen, LlamaIndex, RAG, tool calling • Vector Search: pgvector, Pinecone, Weaviate, Qdrant, ChromaDB, semantic search, hybrid search, reranking • Frontend: React, Next.js, TypeScript, Tailwind CSS, Vercel AI SDK, Redux Toolkit, Zustand • Backend: Python, FastAPI, Django, Node.js, Express.js, NestJS, REST, GraphQL, WebSockets, Celery, BullMQ • Databases: PostgreSQL, Supabase, MongoDB, MySQL, Redis, Prisma, SQLAlchemy • Cloud & DevOps: AWS, Vercel, GCP, Docker, GitHub Actions, CI/CD • Payments & Auth: Stripe, Stripe Connect, Clerk, Supabase Auth, OAuth 2.0, JWT, RBAC 🤝 HOW WE WORK - Strategy & Architecture: Clarify requirements, choose AI models, and plan workflows and data flow. - Sprint Development: Deliver focused sprints with previews, demos, and feedback. - Security & Testing: Test AI guardrails, data isolation, performance, and token costs. - Launch & Handover: Deploy, document, and support your application. - Whether you need a Full Stack Developer for an AI-powered SaaS platform, custom web app, Agentic AI system, or production-ready MVP, let's discuss your project. Click "𝗜𝗻𝘃𝗶𝘁𝗲" or "𝗦𝗲𝗻𝗱 𝗠𝗲𝘀𝘀𝗮𝗴𝗲" and tell me what you're building. Keywords: Full Stack Developer | AI-Powered SaaS | Custom Web Apps | Custom Web Application Development | AI Developer | Agentic AI Developer | SaaS Development | React Developer | Next.js Developer | TypeScript | Node.js | Python Developer | OpenAI | Anthropic Claude | LangChain | LangGraph | CrewAI | AI Agents | Autonomous Agents | RAG | pgvector | Vector Database | Supabase | AWS | API Development | Web Application Development | AI Integration | AI Automation | AI MVP Development | AI SaaS Platforms