You need a fast, scalable, revenue-ready SaaS MVP that stands out globally? I'm Usman, a senior full-stack developer expert in React.js, Next.js, Supabase, Node.js, AI integrations (LLM, OpenAI, n8n Automation), AI tools (Cursor, Claude, Lovable), and MERN. I help founders build web applications that load up to 3× faster, scale reliably, and improve conversion and retention. 🔹 What I Specialize In: ✅ Frontend: React.js, Next.js, Vite, Redux, TypeScript, Tailwind CSS, WordPress, JavaScript, GSAP, Adalo, Fabric.js, Tiptap editor, Web Development, Webflow ✅ Backend & Automation: Node.js, Supabase (Auth, Database, Storage), Express.js, Nest.js, Hocuspocus Yjs, n8n, Zapier, Make, Webhooks, Web Application ✅ APIs & AI Integrations: LLMs, LangChain, RAG, OpenAI, Twilio, Elevenlabs, Chatbots (Vapi), RAG, SDKs, NLP, OCR, RESTful APIs, GraphQL, Shopify Storefront, Stripe, Hugging Face ✅ AI Dev Tools & Vibe Coding: Cursor, Claude, Lovable, GitHub Copilot, Replit, Bolt, Base44 ✅ Database: Supabase, MongoDB, PostgreSQL, Firebase ✅ Realtime Features: Socket IO, WebRTC, Supabase Realtime ✅ Mobile: React Native, Expo ✅ Cloud & Devops: AWS (EC2, S3, Lambda), Vercel, Cloudflare, Netlify, Docker, Nginx, GCP, Azure, Apache, SSL Certbot, SSH, CI/CD, Github, Gitlab 💡 No code, no brand? No problem. I'll take your vision from zero to launch-ready, complete with sleek UI/UX, scalable infrastructure, and smart AI features that give you a competitive edge. 📈 Outgrown your current tech stack? I'll refactor, optimize, and upgrade your application with modern frameworks (Next.js, Node.js, Supabase) and AI (OpenAI, LLMs, LangChain, SDKs) capabilities, turning bottlenecks into breakthroughs. 🎯 Industries I have worked with: Fintech, Crypto/Trading, SaaS, E-commerce, Healthcare, Real Estate, EdTech, Sports, GPS Tracking, and many more 🔹 What You Get: ✅ Full-cycle Web development from idea to launch ✅ Clean, scalable, maintainable code using Next.js, Node.js ✅ AI-powered features and smart automation ✅ Seamless third-party API integrations ✅ Payment gateway setup (Stripe, PayPal, Crypto, Razorpay, Local Bank, etc) ✅ Real-time chat, tracking, and live updates ✅ Mobile-responsive, fast-loading interfaces ✅ Bug fixes, optimization, and ongoing support 🚀 Why work with me? ⭐You get 1 expert who handles everything - Design to Deployment. No coordination headaches. ⭐ I believe technical skills are only half the job. The other half? Communication. Here's how I make sure we're always on the same page: - Daily 2-minute Loom updates or written Progress report - 4-hour US/EU timezone overlap - Clean, documented code - Focus on long-term partnership 𝗥𝗲𝗮𝗱𝘆 𝘁𝗼 𝘀𝘁𝗮𝗿𝘁? Check out my portfolio below or click the green 'Invite' button. I offer a FREE 15-minute architectural review to ensure we are the right fit before we start. Thanks, Usman Khalid Right Keywords to find me: React, React.js, React Native, Node.js, Node, Next.JS Next JS, Javascript, Typescript, Supabase, Firebase, Figma, LLMs, OpenAI, ChatGPT, Gemini, Express.js, Nest.js, Docker, Github, Linear, Trello, Slack, PSD, XD, Web Development, HIPPA, GSAP, Framer motion, GDPR, QA, Web Application, Web Design, Website Design, Wordpress, Shopify Storefront, Tailwind CSS, HTML, CSS, Shadcn, N8n, Make, API, API Development, API integration, Adalo, npm, monorepo, polyrepo, Bootstrap, Frontend, Backend, Bug Fixiation, Prompting, RLS, Auth, MERN Stack, Stripe, Paypal, Vercel, Netlify, Amazon Web Services, AWS, WebRTC, Tiptap, Crypto bot, Chatbot, Ui/Ux, LLM, Azure, Zustand, Redux, Airtable, AI Developer, MVP, SaaS, Lambda, Third party API, Blockchain, Wordpress, Php, Headless CMS, Cypress, Jest, Cursor, Lovable, Gemini, Claude, GitHub Copilot, Replit, Bolt, Base44, puppeteer, pdf generation, pdf.js, fabric.js, electron.js, MERN, Hugging Fcae, Webflow, AI powered Automation

Hi, Why choose me over other freelancers ❓ Because I have 🏅 Top Rated Plus Badge (held by the top 1% on Upwork) ⭐ 100% success rate 💼 2800+ hours worked 😎 6+ years of experience working as a JS developer, MERN, MEVN, and MENN stack development. My expertise is listed below -- AI incorporation - OpenAI (for generating AI text) - StabilityAI (for generating AI images) - IBM API -- React js - Redux - Redux Saga - Typescript - Redux Toolkit -- NextJS -- Stripe - Stripe Connect - Stripe Checkout Session - Stripe Payment Link - Stripe Product Creation - Stripe Customer Creation - Stripe Payment through different methods - Stripe Marketplace - Stripe Subscription - Stripe Sponsorship -- Socket.js -- VueJS - Vuetify - Pinia -- Node JS - ExpressJs - RestAPIs - ORM (Sequelize) - JWT -- Styling CSS - Tailwind CSS - MUI - styled-components - Sass - Vuetify -- Databases - MongoDB - NoSQL - SQL - MYSQL - Postgres - Firebase - Supabase -- ORM - Prisma - Sequelize - TypeORM -- AWS services - SES - S3 - EvengtBridge - Cloudformation - Lambda - serverless Architecture - serverless framework - EC2 - Amplify - Route53 - RDS -- Azure - Azure Functions - Azure Static Apps - Azure SQL -- Docker -- CICD and Automation - github workflows - n8n - retool -- PHP - APIs building - bugs fixing - Laravel --workflows: -n8n -retool -github workflows Other Services 1. Video Streaming 2. Screen and Camera Recording in JS 3. SMS/MMS communication in JS 4. Email communication in JS 5. Email Templates in JS 6. Animations in JS 7. Calendar, Time Management, and Managing availabilities in JS 8. Google Analytics Integration 9. Session Recording(to analyze users behaviour) 10. Clerk (For Authentication) I am committed to delivering high-quality results and am always looking for new ways to improve my skills and knowledge.

I’m a Software Engineer and SaaS/AI product builder focused on MVP development, full-stack development, web apps, mobile apps, automation-heavy platforms, CRMs, admin dashboards, client portals, marketplaces, and AI-powered tools. I use a practical engineering stack to build fast and scalable products: Next.js, React, React Native, Expo, Supabase, PostgreSQL, Node.js, SQL, JavaScript, APIs, Stripe, OpenAI/Claude, Claude Code, Cursor, and AI-assisted development workflows. Clients usually come to me when they need one of three things: → A SaaS MVP or startup MVP built from scratch and launched quickly → A web or mobile app with clean architecture, authentication, database design, payments, and admin logic → An AI agent, LLM application, chatbot, RAG system, automation system, or internal tool connected to real business workflows What I can help with: → SaaS MVP architecture and product development → Full-stack web development with Next.js, React, Supabase, PostgreSQL, Node.js, and APIs → React Native / Expo mobile app development → Supabase backend, auth, database, storage, RLS, and SQL → AI agents, LLM apps, OpenAI/Claude integrations, GPT-based chat, AI chatbots, summarization, RAG, and workflow automation → Stripe subscriptions, payments, Apple Pay / Google Pay → API integration, custom JavaScript/Node.js logic, and backend automation → CRM systems, client portals, marketplaces, admin dashboards, internal tools, and operational dashboards → QA, launch support, performance improvements, and post-launch iterations Beyond client work, I research explainable AI as a PhD student and teach AI agents, automation workflows, and practical AI product development. This helps me design AI systems that are not just impressive in a demo, but structured, understandable, and useful in real business operations. My approach is simple: clarify the business goal, design the right data structure and workflows, build fast, test end-to-end, and make sure the product is actually usable by real users. You work directly with me as the technical lead. If the project needs more capacity, I can also involve trusted specialists for design, QA, automation, or additional development.

If your SaaS handles payments, subscriptions, or financial data — your backend cannot afford to fail. I specialize in building secure, scalable backend systems for FinTech platforms and subscription-based SaaS products. My focus is on high-performance API architecture, payment infrastructure, and reliable database systems designed to handle real transactions and real revenue. I don’t build “just working” APIs. I engineer backend systems that are production-stable, secure, and built for scale. 💳 Subscription & Billing Infrastructure Stripe subscription systems (plans, trials, upgrades, downgrades) Webhook-based billing logic Invoice generation & payment tracking Usage-based billing systems Multi-tier pricing architecture Failed payment handling & retry logic 🔐 Secure SaaS Backend Architecture Multi-tenant SaaS backend design Role-based access control (RBAC) JWT & OAuth2 authentication Secure API authorization layers Audit logs & activity tracking Data isolation strategies Security and clean architecture come first — especially in financial systems. ⚙️ Scalable API & System Engineering REST & GraphQL API development Modular backend architecture (NestJS / Express) Background jobs & queue systems Event-driven workflows High-traffic API optimization Error handling & production debugging 🗄 Database & Performance Optimization Advanced PostgreSQL schema design Query optimization & indexing strategies Transaction-safe financial data handling Redis caching layers Data modeling for subscription systems Prisma ORM & database migrations Well-structured databases prevent scaling headaches later. ☁️ Cloud & Infrastructure (SaaS-Focused) AWS (EC2, RDS, S3, Lambda) Docker containerized environments CI/CD pipelines Secure production deployment Infrastructure cost optimization Monitoring & logging setup I design backend systems that support uptime, performance, and growth. 📈 Systems I Build Subscription-based SaaS platforms FinTech dashboards & payment systems API-first SaaS products Internal financial tools Usage-based SaaS platforms Secure admin panels 🧠 How I Work I think in systems before writing code. Architecture planning Database modeling Secure authentication design Modular API development Billing & webhook implementation Production deployment & monitoring The result: ✔ Clean, maintainable backend ✔ Stable financial logic ✔ Scalable infrastructure ✔ Reduced technical debt ✔ Long-term SaaS readiness If you're building a SaaS product that handles subscriptions, payments, or financial workflows, I can help you build the backend foundation correctly from day one. Keywords Node.js Backend Development, FinTech Backend Engineering, Subscription Billing Systems, Stripe Integration Developer, PostgreSQL Database Design, Multi-Tenant SaaS Architecture, Secure API Development, NestJS Backend Developer, SaaS Payment Infrastructure, REST API Development, GraphQL API Architecture, JWT Authentication Systems, AWS SaaS Deployment, Backend Performance Optimization, Usage-Based Billing Systems

Two of the products I built were acquired. One raised $289K in funding off the MVP I shipped. Over the past 7 years, I've delivered 40+ products across SaaS, AI tools, marketplaces, and internal systems. I take projects from idea to production and stay accountable for what ships. Not just the code, the architecture decisions, the tradeoffs, the things that matter six months after launch. WHAT I'VE BUILT: • AI scheduling assistant with LLM-driven email parsing, calendar logic, and a user dashboard. The founder raised $289K after the MVP launched • Long-term engineering for a UK digital agency across multiple products and client projects. The agency was later acquired • Content automation platform using n8n, Slack, and AI that replaced hundreds of hours of manual work • Real-time crypto analytics system with BigQuery pipelines, AI summaries, and a Next.js dashboard • Health tracking app with 50+ device integrations, React Native mobile, and live doctor consultations MY STACK: • Frontend: React, Next.js, TypeScript, Tailwind CSS • Backend: Node.js, NestJS, Python, Ruby on Rails • Database: PostgreSQL, MongoDB, BigQuery • AI: LangChain, RAG, OpenAI, Gemini, vector databases • Automation & Integrations: Stripe, GraphQL, REST, AWS, n8n, Make HOW I WORK: • You share your requirements. I come back within a few hours with questions and a rough plan • Weekly demos with working software. No disappearing for two weeks • Clean code, proper Git workflow, documented. Easy to hand over or build on top of I take on full stack product builds, AI integration, workflow automation, and ongoing engineering contracts. If you've got something stuck or something new to build, send me the details and I'll get back to you quickly.

I build AI-native SaaS applications and web platforms using React, Next.js, TypeScript, Tailwind CSS, Supabase, and the Claude API. Clean code, mobile-first, deployed to Vercel. What I build: SaaS MVPs and full web applications Custom dashboards and admin panels Stripe integrations (payments, subscriptions, Connect/payouts) AI-powered features (Claude API, OpenAI) Database architecture and security (Supabase, PostgreSQL, RLS) Recent work: Marketplace platform with Stripe Connect, role-based dashboards, and real-time data — shipped in 9 days solo using Claude Code SaaS platform with 100+ active users, built end-to-end Architecture and security audit for a next-gen SaaS rebuild (5-star review) I use Claude Code as my primary development workflow — it lets me ship production-quality applications at 2-3x traditional speed without sacrificing code quality. 19 years Navy. I communicate clearly, hit deadlines, and don't disappear.

📢STOP LOSING SLEEP OVER TECHNICAL DEBT, SLOW API RESPONSE TIMES, OR MESSY CODEBASES. 🔍 Are you a founder or an engineering lead looking to build a production-ready platform that scales from day one? I help businesses take complex ideas from concept to successful launch—without the drama, missed deadlines, or communication gaps. 💻 With over 6 years of experience, I bring "Big Tech" engineering standards to your startup or enterprise. Whether you need a rapid MVP built on the MERN/MEAN stack or a high-concurrency, microservices-driven system using GOLANG and ELIXIR, I don't just write code—I engineer scalable business solutions. 🤝 WHAT YOU GET WHEN WE PARTNER: ➡️ Transparent Delivery: Daily updates, short feedback loops, and clear communication. Zero "black box" development. ➡️ Clean, Maintainable Code: Heavy emphasis on proper database design, typed languages, and scalable architecture so your next team can easily understand and extend the product. ➡️ Post-Launch Reliability: I don't just ship and disappear. I provide runbooks, monitoring setups, and pragmatic post-launch support to ensure your platform stays stable. ➡️ Fast Start: Day-one environment setup and a small, risk-free first milestone to prove value immediately. 🚀 CORE SERVICES & USE CASES: 💠 Product Development: Custom SaaS Development, MVP Development, Web Application Development. 💠 System Architecture: Microservices, Event-Driven Systems, High-Concurrency Backends, Database Optimization. 💠 API Engineering: RESTful APIs, GraphQL, Third-Party API Integrations (Stripe, Twilio, OpenAI/LLMs, etc.). 💠 Real-Time Systems: WebSockets, Chat Applications, Live Tracking Dashboards. 🛠 MY TECHNICAL ARSENAL: ➡️ Full-Stack Ecosystems: MERN Stack, MEAN Stack ➡️ Backend & APIs: Node.js (Express.js, Nest.js), Golang (Gin, Fiber), Elixir (Phoenix, LiveView), Python. ➡️ Frontend Development: React.js, Next.js, Angular.js, TypeScript, JavaScript (ES6+), Tailwind CSS. ➡️ Databases: PostgreSQL, MongoDB, Redis, Elasticsearch. ➡️ DevOps & Cloud: AWS, GCP, Docker, Kubernetes, CI/CD Pipelines, Serverless Architecture. Skip the endless scrolling through unreliable profiles. Send me a message today with a brief overview of your project, and let’s outline a clear, actionable roadmap for your first milestone. ⌨ 𝗞𝗲𝘆 𝗪𝗼𝗿𝗱𝘀: Elixir, OTP, Beam, Go, Gin, Phoenix Framework, LiveView, Surface, Drab, Cowboy, Ecto, GraphQL, Nerves, GenServer, Supervisor, Task, Ecto, PostgreSQL, MySQL, MongoDB, Redis, Riak, Golang, Dart, Full-Stack Developer, ReactJS, TypeScript, JavaScript, jQuery, Angular, AWS, Google Cloud Platform, Docker, MEAN Stack, MERN Stack, Front-End Development, HTML5, CSS3, Bootstrap, Azure, DevOps, Kubernetes, WebSockets, SEO-Friendly Web Development, Cross-Platform Development, Next.js, Express.js, Vue.js, React.js development, React frameworks, Git, Tailwind CSS, SASS, SCSS, Gitlab, Gulp, Webpack, Figma, Responsive Design, Cross browser compatibility, Nuxt.js, GitHub, Elixir, Golang, Phoenix Framework, LiveView, Node.js, Gin, Nest.js, GraphQL, PostgreSQL, MongoDB, Redis, Kafka, RabbitMQ, AWS Lambda, Kubernetes, Terraform, AI Chatbots, Machine Learning, LLMs, NLP, OpenAI, FinTech, Healthcare AI, SaaS Development, API Development, DevOps, CI/CD, Docker, Cloud Computing, Microservices, WebSockets, Agile, React, Next.js, Vue.js, TypeScript, Tailwind CSS, Stripe, Twilio, AI Automation, Cloud Infrastructure, Serverless Computing.

I’m a Principal Full Stack Engineer and Software Architect with 15+ years of experience designing and scaling SaaS, AI, Fintech, Healthcare, and E-Commerce, and now evolving those platforms with AI-driven capabilities. I design architectures where LLMs, embeddings, and data pipelines work alongside robust APIs, enabling automation, insight generation, and conversational interfaces inside enterprise products. I’ve worked across the full company spectrum: • Startups that needed rapid MVPs, lean architectures, and fast iteration • Scaleups where performance, stability, and automation become critical • Enterprises with complex compliance, multi-team collaboration, and long-term architectural planning My Teck Stacks & Specializations: • Frontend: React, Next.js, TypeScript, Tailwind, Material UI • Backend: Node.js (Express, Nest.js), Python (FastAPI, Django), Java, C#, REST, GraphQL, WebSockets AI & Data: LLMs, RAG pipelines, embeddings, vector DBs, LangChain, LlamaIndex, ETL/ELT • Cloud & DevOps: AWS, Azure, GCP, Docker, Kubernetes, Terraform, CI/CD (GitHub Actions, Azure DevOps) • Databases: PostgreSQL, MySQL, MongoDB, Redis, DynamoDB • E-Commerce / CMS: Shopify, WooCommerce, WordPress (custom plugins, headless setups) I specialize in system and database architecture, designing platforms that handle complex business logic, high traffic, and real-time data at scale. I build distributed ecosystems using domain-driven design, microservices, and event-driven patterns, supported by resilient messaging workflows, serverless compute, and horizontally scalable APIs. From orchestrated services to autonomous event pipelines, and from optimized relational models in PostgreSQL/MySQL to high-throughput document and cache layers in MongoDB and Redis, I ensure every layer of the system is tuned for performance, reliability, and seamless growth. On the product side, I’ve built and optimized Shopify, WooCommerce, and custom WordPress solutions - integrating payments, automating operations, and improving conversions through smart architecture and automation. Clients value me for translating complex requirements into intuitive, high-performance applications while leading projects with transparency and efficiency. Every engagement is about long-term reliability. I ensure that what we build today continues to support tomorrow’s growth.

I'm an AI agent developer and backend architect with 10+ years building production AI systems: autonomous agents, RAG pipelines, and automation that hold up under real users and real load. I've scaled platforms to 50M+ users and shipped AI for clients across the US, UK, and Australia. IIT Kanpur alumnus. I bring both the systems depth to make AI reliable and the product sense to make it useful. What I build: 1. AI agents and agent infrastructure. Autonomous agents, MCP servers, tool use, function calling, and multi-agent orchestration that run real workflows across ops, sales, and support. I also build the harness around them, state, retries, guardrails, and observability, so they hold up in production, not just in demos. 2. RAG pipelines that survive real load. Query embedding, parallel vector search, context assembly, and streaming LLM synthesis, with ETL ingestion, chunking, dedup, and PII guardrails built in. 3. Scalable, multi-tenant backend architecture. Node.js, TypeScript, NestJS, and Python microservices with multi-tenancy, governance, and security designed in from the start, over polyglot data layers: Postgres, MySQL, MongoDB, Redis, Elasticsearch, Neo4j, ClickHouse. 4. Workflow automation and integrations. End-to-end automations with n8n, Make, Zapier, and Temporal, wired into the tools teams already use: Slack, Notion, WhatsApp, ClickUp, Telegram, and more. Selected work: - Scaled a creator-economy platform to 50M+ users on AWS EKS and Cloudflare Workers, including payments infra with Stripe Connect, Apple IAP, and Google Play Billing. - Built AI agents and MCP servers for an AI-native business platform handling finance, sales, and support workflows. - Re-architected an autonomous AI worker platform for multi-tenancy, scalability, governance, and security. - Designed a conversational RAG copilot on PostgreSQL + pgvector for project management and admin tasks via natural language. - Integrated Facebook, Google, Instagram, and TikTok ad APIs across 800+ store locations for local inventory ads and ROI tracking. Core stack: Models and frameworks: GPT-4o, Claude, Gemini, LangChain, LlamaIndex, AutoGen, CrewAI, LangGraph, LangSmith, Semantic Kernel, DSPy. Agent infrastructure: MCP servers, function calling, tool use, multi-agent orchestration, OpenClaw, Hermes, LangServe, Modal, Replicate. Vectors and memory: Pinecone, pgvector, Weaviate, Chroma, Redis. ML and DL: TensorFlow, PyTorch, Hugging Face, Scikit-learn. Backend: Node.js, TypeScript, NestJS, Python, FastAPI, GraphQL, WebSockets, WebRTC, RabbitMQ. Data: Postgres, MySQL, MongoDB, Redis, Elasticsearch, Neo4j, ClickHouse, Firebase. Integrations: Slack, Notion, WhatsApp, ClickUp, Telegram, Twilio, Akamai, Rosette, Facebook Graph, Stripe, and marketing APIs across Facebook, Google, TikTok, Twitter, and Dropbox. Cloud: AWS (Lambda, RDS, SQS, OpenSearch, Neptune, S3, ElastiCache, Comprehend, Rekognition), GCP (Firestore, Cloud Functions). If you need someone who can take an AI idea from prototype to a system that survives real users and real load, let's talk. I reply fast and ship faster.

I build AI-powered systems that automate complex business processes — replacing expensive manual work with software that runs 24/7. As Co-Founder & CTO of Liftlio (US-incorporated, Crunchbase-listed), I built an AI platform from scratch that automates what marketing agencies charge $2K–$15K/month for. Real production results: → +340% organic traffic with AI-generated SEO content (avg score: 89/100) → 24.8% conversion rate — 7.7x higher than paid ads → AI outreach engine: prospects processed autonomously → 8-platform automation with isolated Docker containers per client The infrastructure I designed and built solo: → Auto-scalable VPS with 180+ Docker containers in production → On-demand GPU compute (RunPod): I spin up GPUs only when needed for heavy AI — video/image generation, model training & fine-tuning, batch inference — billed per second, with zero idle cost → Multi-project browser orchestration: per-client isolated containers with Chromium, AI agent (Claude), residential proxy, VNC access, and anti-detection (behavioral mouse/typing/scroll patterns) → SEO Agent: autonomous container (Claude Code CLI + Puppeteer) that analyzes Google Trends, creates 2500+ word articles, monitors ranking decay daily → Video Qualifier: Python/FastAPI service using Claude Sonnet for semantic video analysis — replaced enterprise tool at 10x less resource usage → Custom analytics server (PostHog alternative) with real-time 3D globe, conversion attribution, LLM citation tracking → Full SaaS backend on Supabase: 400+ PostgreSQL functions, Edge Functions, RLS, branching workflow (dev/main/local), Square billing → Google Cloud APIs: 1.81M YouTube queries/day quota Before Liftlio: senior backend engineer at a fintech processing 100M+ transactions. What I deliver for clients: → AI/ML systems that work in PRODUCTION — not demos → On-demand GPU power (RunPod) for heavy AI — generate video/images and train models at pennies per job, with no monthly cloud bills → Docker infrastructure and container orchestration → Complex database architecture (400+ SQL functions) → Full-stack SaaS (React 19, TypeScript, Node, Python) → Browser automation at scale with anti-detection → Healthcare automation with HIPAA compliance Fast communication, production-ready delivery.