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𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝗔𝗜 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿 & 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 | 8+ 𝗬𝗲𝗮𝗿𝘀 | 𝟭% 𝗼𝗳 𝗨𝗽𝘄𝗼𝗿𝗸 | 𝟭𝟬𝟬% 𝗝𝗼𝗯 𝗦𝘂𝗰𝗰𝗲𝘀𝘀. ✅ $300K+ Total earnings ✅8+ Years experience as Fullstack Developer ✅ 80+ Projects Completed. ✅Top Rated Plus. ✅ 100% Job Success Rate. ✅ AWS certified ✅ Python certified ✅50hrs/week available ✅ 4+ AI/ML Integrations 🔴 I am in the 𝗧𝗼𝗽 𝟭% overall on Upwork. 🔴 I am in the 𝗧𝗼𝗽 𝟰% overall on Stack Overflow. 𝐀𝐈 𝐀𝐠𝐞𝐧𝐭 / 𝐕𝐨𝐢𝐜𝐞 𝐀𝐠𝐞𝐧𝐭𝐬: 𝐂𝐫𝐞𝐰𝐀𝐈 / 𝐀𝐮𝐭𝐨𝐆𝐞𝐧 / 𝐀𝐦𝐚𝐳𝐨𝐧 𝐏𝐨𝐥𝐥𝐲 / 𝐃𝐞𝐞𝐩𝐠𝐫𝐚𝐦 / 𝐑𝐚𝐬𝐚 𝐀𝐈 / 𝐑𝐢𝐯𝐞𝐫𝐬𝐢𝐝𝐞 𝐒𝐃𝐊 / 𝐀𝐳𝐮𝐫𝐞 𝐀𝐈 𝐒𝐩𝐞𝐞𝐜𝐡/𝐋𝐋𝐌 𝐅𝐢𝐧𝐞𝐭𝐮𝐧𝐢𝐧𝐠: 𝐔𝐬𝐢𝐧𝐠 𝐏𝐄𝐅𝐓 / 𝐋𝐨𝐑𝐀 / 𝐐𝐋𝐨𝐑𝐀 / 𝐑𝐋𝐇𝐅 / 𝐃𝐏𝐎 / 𝐒𝐅𝐓 𝐰𝐢𝐭𝐡 𝐔𝐧𝐬𝐥𝐨𝐭𝐡 / 𝐀𝐱𝐨𝐥𝐨𝐭𝐥 / 𝐇𝐮𝐠𝐠𝐢𝐧𝐠𝐅𝐚𝐜𝐞 𝐀𝐮𝐭𝐨𝐓𝐫𝐚𝐢𝐧 / 𝐒𝐚𝐠𝐞𝐌𝐚𝐤𝐞𝐫 𝐓𝐫𝐚𝐢𝐧𝐢𝐧𝐠/𝐎𝐩𝐞𝐧-𝐒𝐨𝐮𝐫𝐜𝐞 𝐋𝐋𝐌𝐬: 𝐋𝐋𝐀𝐌𝐀 𝟑 / 𝐌𝐢𝐬𝐭𝐫𝐚𝐥 𝟕𝐁 / 𝐌𝐢𝐱𝐭𝐫𝐚𝐥 𝟖𝐱𝟕𝐁 / 𝐅𝐚𝐥𝐜𝐨𝐧 / 𝐆𝐞𝐦𝐦𝐚 / 𝐁𝐥𝐨𝐨𝐦 / 𝐎𝐫𝐜𝐚 𝐌𝐢𝐧𝐢 / 𝐆𝐮𝐚𝐧𝐚𝐜𝐨/𝐅𝐚𝐬𝐭 𝐈𝐧𝐟𝐞𝐫𝐞𝐧𝐜𝐞: 𝐯𝐋𝐋𝐌 / 𝐓𝐆𝐈 / 𝐓𝐞𝐧𝐬𝐨𝐫𝐑𝐓-𝐋𝐋𝐌 / 𝐒𝐊𝐏𝐢𝐥𝐨𝐭/𝐏𝐫𝐨𝐦𝐩𝐭 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢𝐧𝐠: 𝐌𝐮𝐥𝐭𝐢-𝐭𝐮𝐫𝐧 / 𝐅𝐞𝐰-𝐬𝐡𝐨𝐭 / 𝐙𝐞𝐫𝐨-𝐬𝐡𝐨𝐭 / 𝐑𝐀𝐆-𝐁𝐚𝐬𝐞𝐝 / 𝐏𝐫𝐨𝐠𝐫𝐚𝐦𝐦𝐚𝐛𝐥𝐞 𝐏𝐢𝐩𝐞𝐥𝐢𝐧𝐞𝐬/𝐐𝐮𝐚𝐧𝐭𝐢𝐳𝐚𝐭𝐢𝐨𝐧: 𝐀𝐖𝐐 / 𝐆𝐏𝐓𝐐 / 𝐆𝐆𝐔𝐅 / 𝐆𝐆𝐌𝐋 / 𝐐𝐋𝐎𝐑𝐀 / 𝐏𝐓𝐐 / 𝐃𝐐/𝐑𝐀𝐆 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 & 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: 𝐋𝐚𝐧𝐠𝐂𝐡𝐚𝐢𝐧 / 𝐋𝐥𝐚𝐦𝐚𝐈𝐧𝐝𝐞𝐱 / 𝐂𝐡𝐫𝐨𝐦𝐚 / 𝐅𝐀𝐈𝐒𝐒 / 𝐏𝐢𝐧𝐞𝐜𝐨𝐧𝐞 / 𝐐𝐝𝐫𝐚𝐧𝐭 / 𝐖𝐞𝐚𝐯𝐢𝐚𝐭𝐞 / 𝐌𝐢𝐥𝐯𝐮𝐬 Greetings! I am Atul Kumar, a seasoned developer with over 8+ years of experience in web application and software development. Working with LLMs for the past 8+ years and have good expertise in AI Agents development using langchain, LlamaIndex, and LLMs like Claude, GPT4o, Amazon Bedrock, Ollama 🔹 AI Agents / Voice Agents: CrewAI, AutoGen, Amazon Polly, Deepgram, Rasa AI 🔹 LLM Fine-tuning: PEFT, LoRA, QLoRA, RLHF, DPO with Unsloth, Axolotl, HuggingFace AutoTrain 🔹 Open-Source LLMs: LLaMA 3, Mistral 7B, Mixtral 8×7B, Falcon, Gemma 🔹 Inference Optimization: vLLM, TGI, TensorRT-LLM 🔹 Prompt Engineering: Multi-turn, Few-shot, Zero-shot, RAG-based prompts 🔹 Quantization: AWQ, GPTQ, GGUF, GGML 🔹 RAG Systems: LangChain, LlamaIndex, ChromaDB, FAISS, Pinecone, Qdrant 🔹 Data Pipeline: Synthetic dataset generation, LLM evaluation frameworks 🔹 LLM Deployment: AWS Sagemaker, RunPod, GCP AI Platform, Vercel AI SDK 🖥️ 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗦𝗸𝗶𝗹𝗹𝘀: 🔹 Proficient in Node.js, Express.js, Python, Django, Flask, AWS Lambda for backend API. 🔹 Experienced with relational & NoSQL databases: MySQL, PostgreSQL, MongoDB, Firebase, Firestore. 🔹 Skilled in Python FastAPI, REST API, GraphQL API development, and database schema design. 🔹 Knowledgeable in Redis, Docker, Kubernetes, AWS EC2, S3, Nginx for scalable infrastructure. 🔹 Experienced with Nest.js for enterprise-grade server-side applications. 🔹 LangChain, LangServe, LangSmith, HuggingFace, Transformers for AI/LLM integrations. 🔹 Vector Databases: Chroma, FAISS, Pinecone, Qdrant for RAG pipelines. 🔹 Low-code AI tools: Flowise AI, LangFlow, StackAI for rapid prototyping. 🔹 Familiar with Celery task queues, testing frameworks (Pytest, Unittest), and automation tools like Selenium. 🌐 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗦𝗸𝗶𝗹𝗹𝘀: 🔹 Proficient in TypeScript, Redux Toolkit, Tailwind CSS with Next.js for high-performance frontends. 🔹 Skilled in building Progressive Web Apps (PWA) and Single Page Applications (SPA). 🔹 Expert in Vue.js, Nuxt.js, React.js, Next.js, HTML5, CSS3, React Native for responsive and cross-platform UIs. 🛠️ 𝗧𝗼𝗼𝗹𝘀 & 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀: 🔹 Skilled in Python ML libraries: Scikit-learn, Numpy, Pandas, Matplotlib, Seaborn. 🔹 Familiar with OpenAI APIs, Whisper, GPT models, ChatGPT integration, and AI chatbot deployment. 🔹 Experienced with AWS (Lambda, S3, EC2, Sagemaker), Git/GitHub, and Linux environments (Ubuntu, CentOS). 🌟 𝗔𝗱𝘃𝗮𝗻𝗰𝗲𝗱 𝗔𝗜 & 𝗟𝗟𝗠 𝗦𝗸𝗶𝗹𝗹𝘀: 🔹 AI Agents / Voice Assistants: CrewAI, AutoGen, Amazon Polly, Deepgram, Rasa AI. 🔹 Open-Source LLMs: LLaMA 3, Mistral 7B, Mixtral 8×7B, Falcon, Gemma. 🔹 Inference Optimization: vLLM, TGI, TensorRT-LLM for high-speed deployments. 🔹 Prompt Engineering: Multi-turn, Few-shot, Zero-shot, RAG-based prompts. 🔹 Quantization: AWQ, GPTQ, GGUF, GGML for efficient LLM deployment. 🔹 LLM Fine-tuning: PEFT, LoRA, QLoRA, RLHF, DPO with Unsloth, Axolotl, H My expertise spans both frontend and backend technologies, as well as a variety of tools and additional skills that enable me to deliver comprehensive solutions. I am dedicated to providing high-quality, efficient solutions that cater to the unique needs of each project. My diverse skill set allows me to approach challenges from multiple angles, ensuring robust and innovative solutions. Warm regards, Atul Kumar

I build SaaS platforms, web apps, and MVPs with Next.js, Django, React, and Node.js — from architecture to production. AI integration with OpenAI and Claude included where it adds real value. Most SaaS and web apps fail after launch — slow, unstable, or not built to scale. I fix that with clean full-stack architecture, PostgreSQL design, and AWS deployment built for growth from day one. 🌟 What I have delivered • SaaS MVP with React, Next.js, Node.js that helped a startup secure first funding. • AI app with Claude and OpenAI that reduced manual work by 70%. • Multi-tenant SaaS app serving 10,000+ active users. • Real-time web app handling 500+ concurrent users. • Claude and OpenAI dashboard that increased retention by 30%. 🛠 What I do 🧩 SaaS Development - Custom SaaS platforms with React, Next.js, Node.js - Multi-tenant architecture with role-based access - Admin dashboards, customer portals, scalable backends 🌐 Web App Development - Custom web apps with React and Next.js - Real-time dashboards, admin panels, internal tools - Marketplaces and booking platforms 🚀 MVP Development - Rapid MVPs with React, Next.js, Node.js - Investor-ready launches with scalable architecture - Idea to launch in weeks, not months 🤖 AI Apps with Claude & OpenAI - AI apps powered by Claude and OpenAI APIs - Custom AI agents, chatbots, assistants - GPT-5 and Claude integration into SaaS and web apps - AI workflow automation, RAG, personalization ⚛ React & Next.js frontend - Modern React apps with TypeScript and JavaScript - Next.js with SSR, SSG, App Router - Responsive UI with Tailwind CSS, HTML5, CSS3 - State: Redux, Zustand, React Query - React Hook Form, Framer Motion, shadcn/ui, Material UI, Tailwind 🟢 Node.js or Django Backend & Database - REST APIs with Node.js, Express or Django - PostgreSQL database design and architecture - Authentication, authorization, scalable infrastructure 🔌 API Integration - Custom REST APIs with Node.js and Express - Third-party integrations: Stripe, OAuth, social logins - Webhooks, JWT, AI APIs (Claude, OpenAI) ☁️ Deployment & Cloud - AWS deployment with EC2, S3, Lambda, RDS - CI/CD pipelines and production-ready infrastructure 📈 What makes my work different Most developers hand over a product and call it done. I think about what happens after launch does it scale, is the code clean, is the backend secure, are AI integrations reliable. You get a Full Stack developer who thinks about architecture, scalability, database, AI, and cloud together. Who this works best for • Launching a SaaS built for scale with React and Next.js. • Building an AI app with Claude or OpenAI. • Need an MVP built fast that scales later. • Need a web app with reliable PostgreSQL. • Need API integrations (Stripe, OAuth) done right. • Need product deployed on AWS. ✨ Tools I work with Frontend: React, Next.js, TypeScript, JavaScript, Tailwind CSS, Redux, Zustand, React Query, React Hook Form, Framer Motion, shadcn/ui, Material UI Backend: Node.js, Express.js, Django, REST APIs, JWT, OAuth Database: PostgreSQL, Supabase, MongoDB Cloud: AWS (EC2, S3, Lambda, RDS), DigitalOcean AI & APIs: Claude API, OpenAI API, Stripe API, Webhooks ✨ Why clients work with me • Clean React, Next.js, Node.js architecture your team can extend. • Strong PostgreSQL design that scales with your product. • Claude and OpenAI integration done properly. • Production-ready AWS deployment that is fast and secure. • Clear communication, no surprises. 📩 Click «Invite» to start.

I've spent the last 4 years building full-stack web applications for clients across the US, UK, Europe, and Norway, platforms serving thousands of daily users, AI-powered SaaS products, fintech apps, healthcare platforms, and booking systems across multiple industries. If you need a developer who can take a project from idea to production without handholding, that's what I do. I work overlap hours with US and UK clients and maintain clear communication with same-day response times. —————————————————————— WHAT I BUILD —————————————————————— Full-Stack Web Applications: End-to-end MERN stack builds with React, Next.js, Node.js, and MongoDB/PostgreSQL. Clean code, proper architecture, and no shortcuts that come back to bite you later. AI Feature Integration: LLM-powered features using OpenAI and Claude built into production SaaS products. I build intelligent automation, smart user experiences, and AI-driven workflows that create real competitive advantages for your product. SaaS Products: Multi-tenant systems, subscription flows, admin dashboards, role-based access control, I've built SaaS platforms across food-tech, edtech, healthcare, and salon booking industries. Marketplace & Directory Platforms: Multi-vendor systems, provider directories, booking flows, and payment integrations. I contributed as Technical Lead on DineHome, currently the 2nd largest food ordering platform in Norway, handling thousands of daily users with real-time order tracking across multiple vendors. API Development & Third-Party Integrations: REST APIs, payment gateways, email automation, and third-party service integrations built to scale cleanly. —————————————————————— PROJECTS I'VE DELIVERED —————————————————————— DineHome — Food Delivery Marketplace (Norway) 2nd largest food ordering platform in Norway. Built real-time order tracking, multi-vendor management, and payment workflows handling thousands of daily users with zero downtime during peak traffic. Bluehouz — PropTech SaaS (Switzerland) Property cost analysis platform helping owners understand and compare their utility bills. Built for a Swiss client with a focus on clean data processing and simple user experience. Doocado — AI SaaS Platform (USA) AI-powered food ordering SaaS with LLM integrations for smart menu suggestions and automated customer interactions. Reduced manual operations by 40%. Healthcare Social Platform (Confidential) Secure social media application for healthcare professionals with real-time messaging, content feeds, and role-based access control. Built with Next.js, NestJS and PostgreSQL. TheTutor.me — EdTech Platform (UAE) Online tutoring SaaS with video sessions, scheduling, student-tutor matching, and payment processing. iSalonee — Booking SaaS (UAE) Salon and spa booking platform with appointment management, staff scheduling, and customer CRM. Splinter — Fintech BNPL Product (UAE) Buy Now Pay Later platform with credit scoring, installment tracking, and secure transaction processing. —————————————————————— MY STACK —————————————————————— Frontend → React, Next.js, TypeScript, Redux, Tailwind Backend → Node.js, Express, NestJS, REST APIs Databases → MongoDB, PostgreSQL, Redis, Supabase Cloud → AWS (EC2, S3, Lambda), Docker, CI/CD AI & LLMs → OpenAI, Claude, Gemini, Prompt Engineering —————————————————————— WHY CLIENTS WORK WITH ME —————————————————————— 4+ years building production web applications 27+ projects successfully delivered 100% Job Success Score on Upwork Top Rated Freelancer Trusted by clients in the US, UK, Norway and Europe Clear communication with same-day responses I flag problems early, not after the deadline —————————————————————— I keep my client list small so every project gets my full attention. If you have a project in mind, send me a message and let's talk about what you're building. I'm also happy to jump on a quick 15-minute call if that's easier.

I build Python backend systems that hold up as they grow — designed properly from the start, so you're not rebuilding them a year later when traffic or features outpace the original setup. Most backend problems aren't really about writing code. They come from decisions made early that get expensive later. I focus on getting those right: how the system is structured, how the data is modeled, where the bottlenecks will show up, and what to build now versus what to leave room for. That judgment is what separates a system that scales from one that gets rewritten. What I do: Backend & APIs — FastAPI and Django REST, built for real traffic. Versioned, well-structured APIs with proper error handling, pagination, and idempotency — not just happy-path code. Architecture & scale — Multi-tenant SaaS systems with tenant isolation and role-based access. Structuring services and data flow so the system stays maintainable as it grows, not just on day one. Data layer — PostgreSQL schema design, indexing, query optimization, and migrations without downtime. Redis for caching and queues. Async & background work — Celery, event-driven workflows, webhook handling, and retries — the parts that need to keep working when external services don't. Taking it to production — I deploy what I build: Docker, AWS/GCP, CI/CD, and monitoring. I own the system end to end, so nothing gets handed over half-finished. When a system needs it, I also cover automation — n8n, Make, Zapier, or custom Python scripts — along with payment and third-party API integrations, so you get a complete build rather than parts to stitch together. Why hire me: 70+ completed projects, $80K+ earned on Upwork, 5,500+ hours, and consistent 5-star reviews. Recent work includes a recruitment platform handling 50K+ requests/day, a multi-service exam platform, and multi-tenant SaaS systems running in production. The code is clean, documented, and maintainable, and I deliver on time. If you need a senior engineer to build a backend that stays reliable long after launch — and to make the right calls while building it — message me. Tech: Python, FastAPI, Django, PostgreSQL, Redis, Celery, Docker, AWS, GCP

🔹 Stop hiring developers. Hire someone who understands your product. I help startups and SaaS companies build scalable backend systems, automation workflows, and data-driven platforms, the kind that don’t break after launch. If your product involves APIs, dashboards, large datasets, integrations, or AI features, I’ve probably built it before. What I Build Most Often • SaaS platforms (multi-tenant architecture) • Backend APIs (FastAPI, Django, Node.js/Express) • Integrations (OAuth, webhooks, third-party services, CRMs) • Automation & background workers • Analytics dashboards & admin panels (React / Next.js) • Data processing pipelines • Cloud deployments on AWS Why Clients Hire Me Many projects fail after MVP because the backend wasn’t designed for growth. I design for: 1. clean architecture 2. predictable scaling 3. maintainability 4. faster future features So you don’t need to rebuild in 6 months. Recent Work ✔ Built medical platform MVP (Node.js + React), production ready ✔ Designed military social platform infrastructure (Flask + AWS + Docker) ✔ Created organization-wide email compliance & analysis system (OAuth integrations) ✔ Built IoT monitoring platform with real-time device data ingestion ✔ Developed automation workflows & analytics dashboards Tech Stack 1. Backend Python (FastAPI, Django, Flask) Node.js (Express, NestJS) REST APIs, Webhooks, OAuth 2. Frontend React, Next.js, Vue Tailwind, Material UI 3. Data & Infrastructure PostgreSQL, Redis, MongoDB AWS, Docker, CI/CD Large dataset processing & reporting If you need someone who can own both the architecture and implementation, message me before hiring multiple developers.

Top Rated full-stack developer — $70K+ earned, 1,643+ hours, 94% Job Success across 68 Upwork projects. I lead a 30+ person engineering team at Craxinno Technologies (founded 2017). We've shipped 100+ web apps, mobile apps, and digital products for founders, agencies, and enterprise clients worldwide. Our core stack: React, Next.js, Node.js, TypeScript, Express.js That's where we spend most of our time. We build fast, type-safe, SEO-friendly web applications, SaaS dashboards, internal tools, and marketing sites that hold up at scale. Our own site runs on Next.js + Node.js + TypeScript — we use what we ship. Technologies we work with daily (across 109+ in our stack): • Frontend — React, Next.js, TypeScript, JavaScript, Tailwind CSS, Redux, Zustand, HTML5, CSS3, SASS • Backend — Node.js, Express.js, NestJS, REST APIs, GraphQL, WebSockets • Databases — PostgreSQL, MongoDB, MySQL, Redis, Firebase, Supabase, Prisma • DevOps & Hosting — AWS, Vercel, Docker, CI/CD, GitHub Actions, Nginx • Mobile — React Native, Flutter, Swift, Kotlin • CMS & E-commerce — WordPress, Elementor Pro, Shopify (Liquid, custom apps) • Design — Figma, Adobe XD (UI/UX design, prototyping, design systems) • QA — Jest, Playwright, Cypress, Postman Services we offer 1. Web App Development — Next.js / React SaaS, dashboards, internal tools, marketing sites 2. Mobile App Development — React Native, Flutter, and native (Swift / Kotlin) builds 3. UI/UX Design — Figma-first design with pixel-perfect handoff to code 4. API & Backend Development — Node.js / Express / NestJS APIs, third-party integrations 5. E-commerce — Shopify storefronts and custom apps 6. WordPress — pixel-perfect Figma-to-Elementor Pro builds when CMS flexibility matters 7. DevOps & Maintenance — AWS/Vercel deployment, monitoring, ongoing support Why clients keep coming back • Strong, type-safe codebases — TypeScript end-to-end means fewer production bugs and easier handoffs • Pixel-perfect from Figma — your design is the spec, not a suggestion • Async-friendly delivery — Loom walkthroughs at each milestone, 0–4 hour response time • A full team behind one point of contact — you talk to me, but you get the bandwidth of a 30+ person studio • 5-star reviews across the board — clients consistently call out communication, speed, and clean code Let's talk Whether you have a Figma file, a half-built repo, or just an idea — send it over. I'll review it and tell you honestly whether we're the right fit and how I'd approach it. Thanks for reading, Nimish Taneja Founder, Craxinno Technologies