I’m a Senior Full-Stack Developer & Software Architect with 12+ years of experience building scalable, high-performance applications for USA-based enterprise clients and multibillion-dollar brands. I specialize in designing and delivering end-to-end solutions — from architecture to deployment — with a strong focus on clean code, scalability, and long-term maintainability. In the last 2+ years, I’ve also been working extensively with AI-powered solutions, integrating LLMs (Claude, OpenAI) into real-world applications such as chatbots, automation tools, and intelligent data processing systems. Backend Expertise C#, .NET Core, ASP.NET MVC, Web API, Node.js, Python Building secure, scalable, and high-performance APIs and microservices Frontend Development React.js, Angular, Blazor, Vue.js, TypeScript Modern, responsive, and user-friendly UI development AI & Automation (Latest Focus) Claude API & OpenAI integrations RAG (Retrieval-Augmented Generation) systems AI chatbots & workflow automation Prompt engineering & document processing AI-assisted development using Cursor Cloud & DevOps Azure (App Services, Functions, API Management) AWS (Lambda, S3, SQS, SNS, DynamoDB) Docker, CI/CD pipelines, Azure DevOps Database Expertise MS SQL Server, PostgreSQL, MySQL, MongoDB, Redis Architecture & Best Practices Microservices, DDD, SOLID principles, Clean Architecture

My UPWORK achievements : ✅Hours Logged 4790+ ✅Delivered jobs 17+ ✅JSS 99% with TOP RATED PLUS Badge. I have experience in building responsive web application using React.JS and familiar with its UI components ready to use with Supabase, Strapi, Node.js, AngularJS, Material UI etc. Also I can develop hybrid mobile apps using React Native platform. My expertise includes: = Nuclide | JAVAScript | Expo | Typescript = Sublime, My Text Editor | ESLint | Enzyme =>Sentry | Opensource frameworks - React => Navigation, Redux, Native base => Redux | Redux-Saga | Redux-Persist | React Navigation => Flexbox | Map and Geolocation => Firebase Cloud Messaging | Firebase Realtime Database | Firebase Analytics => Codepush (Hockey App & appcenter) => Social Media Login (Facebook & Google) => Ignite | Expo | CRNA Looking forward for the opportunity to work with potential clients all over the globe.

Building software is easy. Building software that scales with your business is where experience matters. I'm a Senior .NET Developer with 20+ years of experience designing and building scalable SaaS products, enterprise applications, and custom business software. As a Full Stack .NET Developer, I've helped startups, SMEs, and enterprise organizations transform complex business ideas into reliable, secure, and high-performance applications. Over the years, I've successfully delivered 375+ software projects using .NET, ASP.NET Core, C#, Angular, React, Azure, and modern cloud technologies. Whether you need a Senior .NET Developer to build a new SaaS platform, modernize a legacy .NET application, or extend an existing enterprise solution, I focus on delivering software that's scalable, maintainable, and built for long-term success. My expertise covers the complete software development lifecycle, from solution architecture and backend engineering to frontend development, cloud deployment, and ongoing product evolution. I've successfully delivered: • SaaS Platforms Development • Enterprise Web Applications Development • ERP & CRM Systems Development • AI-Powered Business Applications Development • Workflow Automation Solutions Development • Multi-Tenant Applications Development • REST APIs & Microservices Development • Healthcare Platforms Development • FinTech Applications Development • Logistics & Supply Chain Solutions Development • eCommerce Platforms Development • Internal Business Portals Development My core technology stack includes ASP.NET Core, .NET, C#, Entity Framework Core, SQL Server, PostgreSQL, Angular, React, Next.js, Azure, AWS, Docker, Redis, SignalR, Git, and CI/CD. Clients often come to me when they need to: • Build a SaaS product from scratch • Modernize a legacy .NET application • Develop secure REST APIs • Improve application performance • Scale an existing platform • Integrate third-party services • Build cloud-native applications on Azure • Add AI capabilities into existing products I believe writing code is only part of the job. Understanding the business, asking the right questions, and designing solutions that remain reliable as your product grows are equally important. I work closely with clients to make technical decisions that reduce future maintenance costs, improve scalability, and accelerate product delivery. Throughout my career, I've worked across healthcare, finance, manufacturing, logistics, hospitality, education, eCommerce, and AI-driven products. Whether joining an existing development team or leading a project from architecture to deployment, I focus on delivering software that creates long-term value. If you're looking for a Senior .NET Developer who combines deep technical expertise with business thinking, proactive communication, and a commitment to quality, I'd be happy to discuss your project and help you build a solution that's secure, scalable, and built to last.

As a Senior Full-Stack and AI Engineer with 14+ years of experience, I specialize in designing and building scalable web applications, cloud platforms, AI-powered automation systems, and high-performance APIs. I have extensive experience developing enterprise SaaS platforms, CRM/ERP systems, fintech applications, and AI-driven automation solutions using modern technologies such as Python, Node.js, Golang, Java, .NET, Ruby on Rails, React.js, and Next.js. I also work extensively with AI and automation frameworks, building intelligent workflows and LLM-powered applications using tools like LangChain, LangGraph, HuggingFace models, and n8n automation pipelines. Core Technical Expertise AI & Automation LLM integrations (OpenAI, Claude, HuggingFace) LangChain & LangGraph AI workflows Automation pipelines using n8n AI-powered SaaS platforms and content automation systems AI chatbots and intelligent agents Backend Development Python (FastAPI, Flask, Django) Node.js (REST APIs & microservices) Golang microservices Java (Spring Boot) .NET / ASP.NET Core Ruby on Rails Frontend Development React.js and Next.js TypeScript and modern JavaScript frameworks Angular Responsive UI development using Tailwind and Bootstrap Mobile Development React Native cross-platform mobile applications Blockchain Development Solidity smart contracts Ethereum and Web3.js integrations NFT and decentralized applications Cloud & DevOps AWS, Azure, and Google Cloud Docker, CI/CD pipelines Scalable microservices architecture Why Clients Hire Me ✔ 14+ years of professional development experience ✔ Expertise across AI, cloud, full-stack, and blockchain technologies ✔ Proven track record building enterprise SaaS platforms and scalable systems ✔ Strong focus on clean architecture, performance, and maintainable code ✔ Clear communication and reliable project delivery If you are looking for a senior engineer who can build scalable applications, AI-powered solutions, or modern SaaS platforms, I would be happy to discuss your project. Let's connect and bring your idea to life. Thanks, Hitesh Kanwar

⭐ 𝐓𝐨𝐩-𝐑𝐚𝐭𝐞𝐝 | 𝟏𝟎𝟎% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 𝐒𝐜𝐨𝐫𝐞 | 𝟕+ 𝐘𝐞𝐚𝐫𝐬 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 | $𝟖𝟎𝐤+ 𝐄𝐚𝐫𝐧𝐞𝐝 | 𝟒𝟎𝟎𝟎+ 𝐇𝐨𝐮𝐫𝐬 You don’t just need fast code. You need well-architected, production-ready software delivered efficiently. I’m a senior full-stack engineer with 7+ years of experience in Angular, React, and Node.js, combined with an AI-assisted development workflow (Cursor AI, Claude Code, v0, LLM APIs) that helps reduce build time without compromising quality. I focus on shipping clean, scalable products from AI-powered MVPs and LLM integrations to enterprise-grade web applications. 𝐏𝐫𝐨𝐯𝐞𝐧 𝐑𝐞𝐬𝐮𝐥𝐭𝐬: ☛AI SaaS Platform (9 days): Built a GPT-4o-powered document analysis tool with RAG, embeddings, and a React dashboard, launched to 200+ beta users. ☛E-Commerce Marketplace (6 days) Delivered an Angular + Node.js marketplace with Stripe payments, real-time inventory, and AWS deployment. ☛Automotive ERP (12 days) Replaced a legacy system with a custom Angular ERP, reducing admin workload by 60%. 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞: Efficient, AI-Assisted Delivery – AI tools help accelerate development, reduce boilerplate, and catch issues early. Practical LLM Experience – Real-world production use of OpenAI, Claude, Gemini, Replicate, ElevenLabs, and Fal.ai. End-to-End Ownership – Frontend, backend, database, and deployment handled by one senior engineer. Consistent Track Record – Top-Rated on Upwork with a 100% Job Success Score. Strong Technical Judgment – I help shape the right solution, not just implement features. Clear, Reliable Communication – Async-friendly, proactive updates, and transparent progress. 𝐖𝐡𝐚𝐭 𝐈 𝐁𝐮𝐢𝐥𝐝: AI-Powered SaaS MVPs – Angular or React frontends with NestJS / Node.js backends Intelligent Chatbots & AI Agents – Context-aware bots with tools, memory, and RAG AI Automation Workflows – n8n or custom-built LLM-driven automations Enterprise Web Applications – Advanced Angular apps (v10–18) APIs & Microservices – RESTful and GraphQL services E-Commerce & Payments – Stripe, Braintree, Authorize.Net Custom ERP & Business Systems Third-Party API Integrations 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 & 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: 𝐀𝐈 & 𝐋𝐋𝐌 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧: LLM APIs: OpenAI (GPT-4o), Anthropic Claude, Google Gemini, Replicate, ElevenLabs, Fal.ai RAG Pipelines: Embeddings, vector search, document ingestion & retrieval Automation: n8n workflows, custom LLM orchestration, model fine-tuning AI Dev Tools: Cursor AI, Claude Code, GitHub Copilot, Replit Agent Generative Pipelines: Text, image, audio, and video generation 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: Angular 10–18 (CLI, Universal/SSR, Ivy, Lazy Loading, Reactive Forms, i18n) React v18 (Hooks, Context, Next.js–ready) TypeScript & JavaScript (ES2022+) UI Libraries & Styling: PrimeNG, Angular Material, Tailwind CSS AI UI Tooling: v0 by Vercel, Lovable.dev, Bolt.new (rapid component generation) 𝐁𝐚𝐜𝐤𝐞𝐧𝐝: Node.js v18+, Express.js, NestJS API Architectures: RESTful APIs, GraphQL, WebSockets Databases: MySQL, PostgreSQL, MongoDB, SQL Server 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬: Cloud Platforms: AWS (EC2, S3, Lambda), Microsoft Azure, Google App Engine, DigitalOcean Version Control & CI/CD: GitHub, GitLab, Bitbucket, automated pipelines Project Management: Jira, ClickUp, Trello Methodologies: Agile / Scrum 𝐇𝐨𝐰 𝐈 𝐖𝐨𝐫𝐤: Discovery & Scoping (Day 1): I review your requirements, define the architecture, select the right tech stack, and deliver a clear technical scope with realistic timelines, no guesswork or vague estimates. AI-Accelerated Build (Days 2–N): I use AI tools like Cursor AI and Claude Code to speed up development, refactor confidently, and catch issues early, maintaining high code quality while moving fast. Continuous Integration & Testing: Automated tests, cross-device QA, and performance optimization are built into every sprint, not treated as an afterthought. Cloud Deployment & Handoff: I handle production deployment on AWS or Azure, set up CI/CD pipelines, and provide clean documentation so your team can take over with confidence. Ongoing Support & Iteration: After launch, I support maintenance, security updates, and feature enhancements, acting as a long-term technical partner, not just a contractor. 𝐋𝐞𝐭’𝐬 𝐬𝐡𝐢𝐩 𝐬𝐨𝐦𝐞𝐭𝐡𝐢𝐧𝐠 𝐫𝐞𝐚𝐥. Send your idea, and I’ll respond with a clear scope and timeline within hours.

I am a Full Stack Developer with 9+ years of experience in web and mobile application development. I have worked on frontend and backend development, API integration, bug fixing, performance improvement and adding new features. I am comfortable working on both existing projects and new development from scratch. My skills include: • Angular, React and Next.js • Node.js and .NET backend development • REST API integration • MongoDB, MySQL and PostgreSQL • Azure and Firebase • Ionic and React Native apps • Responsive UI development • Bug fixing and application optimization I also have experience working on dashboards, admin panels, authentication systems and third-party API integrations. I am comfortable working independently as well as with teams, and I always try to maintain clear communication during the project. I focus on writing clean and maintainable code and always try to deliver quality work on time. Available for both short-term and long-term projects. Feel free to message me to discuss your project.

Most SaaS MVPs are built to launch, not to scale. I help founders rescue struggling codebases and build high-performance web platforms that handle real user growth without crashing when it matters most. You aren't looking for someone to just write lines of code. You need a technical partner who understands that every bug costs you users, every delay burns your runway, and messy architecture means throwing away your codebase in 6 months. With 6+ years of experience architecting full-stack applications, I don't ask "what do you want me to build?" I ask, "how does this feature drive revenue?" HOW I HELP BUSINESSES: • SaaS Architecture & MVPs: I build scalable, investor-ready SaaS products. I utilize the MEAN stack because it allows for rapid iteration—meaning you get to market and start charging users weeks faster. • Rapid Scaling with Modern BaaS: Leveraging tools like Supabase to cut backend development time in half, preserving your budget for marketing and user acquisition. • Performance Rescues & AWS Cost Reduction: I take over sluggish backends, refactoring them with NestJS or integrating Rust to eliminate downtime and drastically reduce your monthly server costs. • High-ROI AI Integration: I don't just plug in generic chatbots. I build custom RAG pipelines and automate complex user workflows, giving you premium, "smart" features you can upcharge your users for. THE PROCESS: I operate as a consultant first. We map out your business logic, define the exact outcome, and build a technical roadmap that protects your budget. No guessing, no disappearing acts. THE ARCHITECTURE & STACK: • Frontend: Angular (Enterprise SPAs), React/Next.js, Tailwind CSS • Backend: Node.js, Express, NestJS, Rust • Database & BaaS: MongoDB, PostgreSQL, Supabase, Redis • API & Cloud: REST, GraphQL, AWS, Docker If you are tired of the "freelancer lottery" and want a reliable engagement that focuses entirely on your bottom line, send me an invite. Let's dissect your project.

• I have Over 10 years of experience in the information technology industry encompassing SDLC, Operation and Client Engagement. • In-depth knowledge of Type Scripting and Angular10/15/18 With Environment Of VS Code Editor, C# 4.5/ .net 8, Aspnet 4.0 and previous ,Web Api, NET Core versions, Entity Framework LINQ Git, • Windows applications (WPF& Win Forms), Razor, Html5, and Css3. • Hands on Ajax, Jquery, JqueryMobile, XSLT & XML. • Strong Hand In Developing applications Using Various Microsoft Technologies. Ml net. • Good Understanding Of OOPS. • Knowledge Of WCF,WPF • Knowledge Of Design Pattern eg. MVC • Good Understanding of software development methodologies, Software Development Lifecycle and quality Processes. • Problem Solving and troubleshooting capabilities. Mobile Development 1) Flutter Android/IOS Some Of Our Completed Projects Are: 5) Perfect Weddings, (SAAS Application for service providers and consumer.) Technologies: Angular19, NET Core web Api, SQL Server 2018, Cloud Environment: AWS Ec2, Rds., S3, Application LoadBalancer,SES Payment Gateway: STRIPE My Role: Worked as Individual Full Stack Freelancer. 4) Event Management System (Web Application For Motorsports Events) Technologies Used: MVC5,Linq and entity framework, Web Services, Bootstrap,Html5, Css3 3) Nt Traffic MGMT (Fiddler Application For Network Traffic Mgmt. Desktop Application) Technologies Used: windows Form, LINQ and entity framework, Web Services 2) CRORJ (News Broadcasting App For Windows Phone) Technologies Used: Xaml,Linq and entity framework, Web Services 1) Deevoir (Health Insurance Application) Technologies Used: Mvc5, Linq and entity framework, Bootstrap,Html5, Css3

👋 Hi, I’m Kailash - A Senior Full-Stack Developer - A PHP/Symfony/Pimcore & GenAI Certified I’m a senior full-stack developer with 12+ years of experience helping companies with end-to-end complex design, build, and stabilize production-grade web applications and SaaS platforms. I work best on complex, long-term projects where clean architecture, scalability, and reliability matter more than quick hacks. ⭐What clients usually hire me for: ************************************** ✅ Building or modernizing PHP / Laravel / Symfony–based systems ✅ Designing clean backend architectures using SOLID & DDD principles ✅ Developing full-stack web applications (backend-heavy) ✅ Upgrade/Migrate or maintain a complex web application ✅ Refactoring legacy systems into maintainable, scalable code ✅ Supporting SaaS products, internal platforms, and business-critical apps ⭐ Core Technical Strengths: ********************************* ✅ OOPs Concepts, SOLID Principles, and Domain-driven design structure. ✅ Web/app development with Back-end and Front-end development ✅ UI/UX for website Design, application design, and development ✅ HTML (5), CSS (3), Ajax, Bootstrap, jQuery, JSON, TailwindCSS ✅ MySQL, SQL, NoSQL, MongoDB, PostgreSQL, MVC, JavaScript, Typescript, Restful API, GraphQL ✅ PHP, Symfony, Laravel, Vue.js, Yii, WordPress, Angular, React, Node.js, Python. ✅ Zend, Pimcore, Spryker, Shopware, API-Platform, DoctrineORM, OpenCart, WooCommerce, Gulp, Tomcat, Solr, Twig, SonataAdmin, Elastic Search, Redux, Redis, RabbitMQ, WebRTC, Livewire, Blade, LAMP stack, PHPUnit, Behat. ✅ AI tools: Cursor, Claude, OpenAI, Replit AI, GitHub Copilot. ✅ Quality analysis with manual and automation. ✅ DevOps/ Server skills: Docker, Kubernetes, AWS/ EC2, and other 3rd party services, Azure, Windows, Linux, Apache2, Nginx, CI/CD ✅ Update methodology: Agile or a Scrum method ✅ Project management Tools: Jira, Stack, and ClickUp. Asana ✅ Hands-on experience with Git and Bitbucket. ⭐ Why Clients Work With Me ********************************* 🏅 12+ years of experience as a full-stack developer 🏅 100% Client Recommendation 🏅 90% of Repeated clients 🏅 8+ years of experience transforming ideas into reality ⭐Industry Experience: ************************** ✔️E-Commerce ✔️Electricity/Gas ✔️Financial Services/FinTech ✔️HealthCare/Pharma ✔️Real Estate ✔️Trasportation & Logistics✔️Law Firms ✔️Event/News ✔️Restaurants/FoodTech ✔️Social Media ✔️Eductaion/E-Learning/LMS ✔️Technology Recruitment ✔️Airport/Aviation/Automotive ✔️Gym/Fitness ✔️Security & Fire Sefty I don’t overpromise; I focus on building systems that last. 🎯 If you’re looking for a senior developer who can take ownership, think critically, and deliver clean, scalable code, let’s talk. — Kailash Sharma

I am a Senior Full Stack Next.js & AI Developer with 11+ years of experience building scalable, high-performance, and production-ready web applications for startups, SaaS companies, and enterprise businesses. I specialize in modern JavaScript development using Next.js, React, Node.js, and TypeScript, focusing on building full stack applications that are fast, secure, and scalable. My expertise includes MERN stack development, SaaS architecture, REST APIs, and AI-powered web applications. My goal is to turn ideas into real, working digital products by combining strong system design, clean coding practices, and modern cloud technologies. ━━━━━━━━━━━━━━━━━━━━━━━ CORE EXPERTISE ━━━━━━━━━━━━━━━━━━━━━━━ I focus on building systems that are scalable, maintainable, and optimized for real-world business use. • Full Stack Next.js development (SSR, SSG, SEO optimized apps) • React.js frontend development with modern architecture • Node.js and Express.js backend systems • MERN stack application development • TypeScript-based scalable applications • REST API and GraphQL API development • SaaS application architecture and development • AI-powered application development using OpenAI ━━━━━━━━━━━━━━━━━━━━━━━ AI & OPENAI DEVELOPMENT ━━━━━━━━━━━━━━━━━━━━━━━ I build AI-driven applications using OpenAI and modern LLM technologies. I help businesses integrate AI into real products, not just prototypes. • ChatGPT integration into web applications • AI SaaS platforms and automation tools • AI chatbots and virtual assistants • Workflow automation using AI models • AI-powered dashboards and analytics systems ━━━━━━━━━━━━━━━━━━━━━━━ FULL STACK DEVELOPMENT ━━━━━━━━━━━━━━━━━━━━━━━ Frontend: • Next.js • React.js • TypeScript • Tailwind CSS • Material UI Backend: • Node.js • Express.js • Authentication (JWT, OAuth) • WebSockets for real-time apps • API development and integration Databases: • MongoDB • PostgreSQL • Firebase • Redis ━━━━━━━━━━━━━━━━━━━━━━━ SAAS & PRODUCT DEVELOPMENT ━━━━━━━━━━━━━━━━━━━━━━━ I build scalable SaaS platforms with multi-user architecture, subscription systems, and API-driven backend systems. • SaaS application development • Multi-tenant architecture design • Subscription and payment integration • Admin dashboards and analytics systems • Cloud-based deployment systems ━━━━━━━━━━━━━━━━━━━━━━━ CLOUD & DEPLOYMENT ━━━━━━━━━━━━━━━━━━━━━━━ • AWS (EC2, S3, Lambda) • Vercel deployment for Next.js • Docker containerization • CI/CD pipelines • Linux server management ━━━━━━━━━━━━━━━━━━━━━━━ PROJECT EXPERIENCE ━━━━━━━━━━━━━━━━━━━━━━━ I have delivered a wide range of applications including: • SaaS platforms • AI-powered applications • CRM and ERP systems • E-commerce applications • Healthcare systems • Real estate platforms • GPS tracking systems • Job portals • Analytics dashboards • Custom enterprise systems Each project is built with scalability, performance, and security as core principles. ━━━━━━━━━━━━━━━━━━━━━━━ WHY CLIENTS WORK WITH ME ━━━━━━━━━━━━━━━━━━━━━━━ • 9+ years of professional full stack experience • Strong expertise in Next.js, React, Node.js, and MERN stack • Deep understanding of SaaS and AI application architecture • Clean, scalable, and production-ready code • Strong communication and problem-solving ability • Focus on business outcomes and product success • Experience working with startups and enterprise teams ━━━━━━━━━━━━━━━━━━━━━━━ WHAT I CAN HELP YOU BUILD ━━━━━━━━━━━━━━━━━━━━━━━ • Full Stack Next.js applications • MERN stack web applications • SaaS platforms with scalable architecture • AI-powered applications using OpenAI • Custom dashboards and admin panels • REST API and backend systems • Real-time web applications • Cloud-based scalable platforms If you are looking for a Full Stack Next.js & AI Developer to build scalable SaaS applications and modern web platforms, feel free to connect. Thanks Mandeep