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✅ ABOUT ME: I am a Professional Full Time Freelancer. I have 8+ years of experience working on Windows/Linux server administration, CICD Devops ,AWS, Azure, windows/Linux troubleshooting, HyperV, proxmox servers, DNS records mapping, IIS, Domains and DNS records management, active directory, web server, webhosting, databases administrations and Mail server implementations, administrations for the mail services MS Office365, Gsuite, Zimbara and postfix . ✅ WHY ME? • Full-time Professional – I work on Upwork as a full-time freelancer. I take every project seriously and I am highly professional. • Highly responsive – I’ll always get back to you in less than 02 hours. • 100% Client satisfaction – I provide revisions and modifications even after our contract ends. • I provide accurate solutions and just as important, I can guide you to future prospects and put your project on the right track. • Good communication skills – You will find me very friendly to talk to. ========================================= #Windows Servers - clients #Linux Server - clients #Web servers - IIS, Apache, XAMPP, Nginx and Tomcat #Database Servers - MSSQL, ORACLE, MYSQL, MongoDB #Webhosting tools- Plesk, cPanel and CWP #Cloud services providers - AWS, Azure, GCP, Digital Ocean, World stream, OVH Cloud, Hetzner and Hosting raja #Hosting providers - Hostinger, Bluehost, Namecheap, Godaddy, Bigrock and Hostgator #Active Directory - setup, users creation, Centralized Management, policy creation and enhanced Security #Troubleshooting - L1, L2 Tools used ============== Github, SVN IIS,Apache,Tomcat,Nginx , Apache Kafka and Wordpress SSH, RDP, VNC, Anydesk, Splashtop and screen connect Mobaxterm,Toad,SSMS and Workbench Plesk,WHM,Cpanel Active Directory, IAM Servicenow, Redmine, Microsoft Teams and Slack Previous Clients Feedback: 1- "Karthik was an exceptional Upworker to deal with. He was responsive, communicative, knowledgeable and proactive at solving my urgent technical issue (my businesses website was down for an unknown reason) and I wouldn't hesitate to recommend him to anyone else seeking an excellent technical support specialist. Thank you Karthik!" 2- "Karthik went above and beyond to progress with a very difficult issue in a very short period of time. He is kind, hard-working, and knowledgeable." 3- "I recently had the pleasure of working with "Karthik Raja" on installing PMB Software project, and I must say it was an outstanding experience from start to finish. I highly recommend "Karthik Raja" to anyone seeking top-notch freelancing services." 4- "he provides ideas to solve our problems he is a best gem have ever met. He focused only in customer satisfaction. no negative reviews." So why wait? Just invite me to your job on Upwork so we can discuss how to make your project a success. Let’s work together and get it done!! Thanks, Karthik

Most full-stack developers can build you a web app. Not many have shipped a satellite imagery search platform with live polygon drawing, KML/KMZ processing, and coordinate-based filtering I have. In 8 years of freelance work, I have built systems that handle genuinely hard problems: geospatial data platforms, n8n workflow automation that cuts hours of manual work down to minutes and AI integrations that actually hold context. My clients tend to come back not because I am cheap but because I ask the right questions before writing a single line of code. What I build: Full-stack web platforms: Laravel, PHP, Node.js, React, Angular, Vue.js Geospatial & mapping tools: CesiumJS, KML/KMZ, polygon search, coordinate systems SaaS products: Food truck management platforms, dating sites, subscription-based apps Document workflows: PDF e-signature systems with drag-and-drop form fields, multi-party signing, and signed PDF return WordPress: Theme setup, customization, deployment, and custom calculator plugins CMS & E-commerce: Shopify, Magento, WooCommerce API & Payment integrations: HubSpot, Stripe, Slack, Google Drive, OpenAI, OpenPath What I build: Complex web platforms: Laravel, React, Angular, Vue Geospatial & mapping tool: CesiumJS, KML/KMZ, polygon search, coordinate systems Workflow automation: HubSpot, Slack, Google Drive, Stripe, OpenAI integrations Access control & IoT: OpenPath API, real-time monitoring systems Mobile & CMS: Shopify, WordPress, hybrid app development Projects worth mentioning: → Satellite imagery search platform with interactive drawing tools and vendor imagery grouping (CesiumJS + React) → Document e-signature platform: parties upload PDFs, drop form fields on pages, sign remotely, and receive countersigned PDFs back automatically → Food truck SaaS: full platform built from concept to deployment → Automated invoice scheduling connecting HubSpot + Younium: eliminated manual finance data entry entirely → Context-aware chatbot using OpenAI API: answers questions, not just keywords → n8n automation flows: Lead capture to CRM sync, automated reporting pipelines, and webhook-driven notifications cutting repetitive operations to zero-touch → Context-aware chatbot using OpenAI API: answers questions, not just keywords I use Jira and Slack, Basecamp to communicate proactively and I don't disappear after deployment. I write code the next developer won't curse at. If you are building something complex and need one developer to take it from whiteboard to deployment let's talk.

I build AI-powered mobile apps and automation workflows for founders who need to ship fast. Most of my recent work is helping non-technical founders and small teams turn an AI idea into a working product — chatbots, AI assistants, n8n automations, OpenAI/Claude integrations, and Flutter mobile apps with intelligent features baked in. What I've built recently: • OpenClaw integrations — multiple active projects covering setup, memory configuration, browser integration, and Mac automation in Shell/Node.js. Recent client: "strong knowledge on AI and technical problem solving." • Mentot — WhatsApp chatbot for virtual assistance, deployed end-to-end • Tailor AI — AI fashion recommendation app built in Flutter • n8n automations connecting AI models to real business workflows • Flutter + Firebase apps with real-time data and clean architecture How I work: • Clear scope before we start — no surprise hours • Daily updates if the project runs more than a week • Comfortable jumping on a Zoom call to align (book one below for $20) • I work US-friendly hours when projects need it I'm associated with TATOS Technologies, a Kerala-based product team that ships AI MVPs in 2-week sprints. For larger projects ($10K+) I can bring in design, backend, and QA support from the team. For smaller scoped work, you get me directly.

👨‍⚖️ Senior .NET Developer & AI Integration Specialist with 15+ years of experience building scalable web, mobile, and desktop applications. Core Skills: • AI Integration Expert. • AI & LLM Solutions • Penetration Testing (Web, Mobile & API Security) • Vulnerability Assessment & Security Auditing • Application Security Testing & Risk Analysis • Python, Data Science, LangChain, NLP • Generative AI. • .Net MAUI, Xamarin Forms • C#, .NET, ASP.NET, WebForms, Blazor • React, Next.js • SQL Server, SSRS • WPF, WinForms • PHP (maintenance & legacy support) 🎖 DOMAIN EXPERTISE ✔️ POS ✔️ Banking ✔️ Travel ✔️ E-Commerce ✔️ Restaurant ✔️ Healthcare ✔️ Finance ✔️ Insurance ✔️ Educations Senior full stack developer extensive hands-on experience developing large scale, mission-critical end-to-end solutions including real-time and complex GUI systems. 💻TECHNICAL EXPERTISE ✔️ More than 15 years of experience in Travel Domain(Hotel, Flight, Tour, Visa, Package, Transfer) Booking website development. ✔️Development Technology : ASP.Net Webforms | SSRS(RDLC Reports) |ASP.NET MVC C#, VB |WEB | ERP & API Integration Specialist ✔️ Expert in third party Hotel API integration like TBO, Hotelbeds, Expedia, Dotw, Agoda, etc ✔️ Expert in third party Flight API integration like FR24, travelport, pkfair, mistify, fairlogics, bebilon, gelelio, flymm domestic myanmar, amedius, etc. ✔️ Microsoft (.Net Core | SignalR | Azure | SQL Server | 365 Identity Authentication (B2C/B2B)) ✔️ MAUI ✔️ NopCommerce ✔️ WordPress ✔️ PowerShell Script Expert ✔️ JavaScript Frameworks - Typescript (Angular | React | Node | Knockout | Vue | Next) ✔️ Source Controls (Git | TFS | Tortoise SVN/SG) ✔️ Database (SQL Server | MongoDB | Elastic Search | Amazon Dynamo | MS Document DB) ✔️ Payment Gateway (PayPal | Stripe | FastSpring | Payfort | Authorize .Net | CCAvenue | VIPPS | YourPay | Betalingservice | Alipay | PayU) ✔️Third-Party Integration: (Sendgrid | Twilio | Google APIs | RESTFull APIs | Ali Cloud SMS | Tencent SMS | MailGun | ShipStation | MSG91) ✔️ OAuth (Google | Office365 | Facebook | LinkedIn) API(REST) | Entity Framework | .Net Core | Angular | KnockoutJS | javascript | jQuery | MERN Stack | Next.js | PHP WordPress | Laravel | Code ignitor. ✔️Mobile Technology : React Native | Flutter | Native Development | Java | Kotlin | iOS | Swift | Objective - C. ✔️Cloud : AWS Cloud Front. S3 Bucket | EC2 | CodePipeline | Beanstalk | Amplify | Azure DevOps ✔️Deployment : CI/CD Pipeline Jenkins | Docker ✔️Azure : Azure AD B2C | Azure Active Directory | Azure SQL Database. ✔️Django, GitLab CI/CD, Django Rest Framework, Celery, Redis, PostgreSQL, Docker, Django-OTP, AWS, Heroku ✔️React, Next.js, Supabase/PostgreSQL, API integrations, subscription/payment management ⚙️ Work Flow Discuss on idea + Analise + Evaluate + Execution + Testing + Delivery = Success 🕒 Availability & 📧 Communication I always prefer a quick short call to project discussion or idea-sharing. It saves prospects precious time & energy. I can start work on the project IMMEDIATELY and work more than 8 to 9 hours/day and 45-50 hours/week. 💬 MESSAGE or INVITE me to build your best product. Always available to help to grow your business.

I have 10+ years of experience in web app development. I have 6+ years experience in React/Next and Svelte/SvelteKit. My Focus is to learn new things around my skills and make my client 100% satisfied with my work. Skills: ✅ react.js ✅ next.js ✅ Svelte ✅ SvelteKit ✅ Micro Frontend ✅ node.js ✅ MongoDB ✅ MySQL ✅ GraphQL ✅ Typescript ✅ Supabase ✅ Firebase ✅ Figma/XD to web page Soft skills: ✅ Flexible ✅ Quick learner ✅ Attention to details ✅ Good communication ✅ Good team member ✅ Working with deadlines ✅ Familiar with Git, GitHub, Bitbucket ✅ Familiar with Jira and Scrum meeting ✅ Familiar with Slack, Skype, Discord and Zoom My expertise in Frontend, Migrations, Speed Optimisation, Responsive Design (Mobile-ready), and UX / UI Design. Hands-on react.js, next.js, Svelte/SvelteKit, NodeJs, Typescript, Supabase, chart.js, Fabric.js, HTML, CSS, SCSS, Figma, Figma to HTML/Web, Tailwind, Bulma.

Hello! 👋 I'm a Full-Stack Developer with a proven track record in production-ready web applications. With expertise spanning both frontend and backend technologies including 3rd party like Twilio, I specialize in crafting seamless user experiences and robust server-side functionalities. Beyond traditional web development, I also excel in AI-powered chatbot creation, leveraging advanced frameworks like LangChain, RAG models, services like Twilio and deploying LLM models on platforms such as Runpod, AWS, Azure and more. What I Bring to the Table: 🥇Frontend Development: ✅ Expertise in JavaScript frameworks/libraries: React, Vue, Angular, Svelte, Streamlit ✅ Building modern, responsive interfaces with TailwindCSS, Bootstrap, Material UI ✅ TypeScript for scalable, maintainable frontend architecture 🥇Backend Development: ✅ Proficient in Node.js, Express.js, and Python frameworks like Django, Flask, FastAPI ✅ Headless CMS integration with Strapi for dynamic content management ✅ Development of secure RESTful and GraphQL APIs ✅ Services like Twilio, Stripe, SendGrid 🥇AI Chatbots & AI Calling Solutions: ✅ Designing conversational agents using LangChain and RAG models ✅ Deployment of LLM models for AI-driven applications ✅ Building voice-enabled bots and AI calling solutions using LiveKit, Twilio, Deepgram VAPI ✅ Chatbot integration with OpenAI API, Dialogflow, and custom AI frameworks ✅ Creation and deployment of autonomous AI agents for complex workflows and customer interactions 🥇Database Management: ✅ Skilled with relational and non-relational databases: PostgreSQL, MySQL, MongoDB ✅ Performance optimization for high-traffic applications 🥇Cloud Deployment & DevOps: ✅ Cloud platforms: AWS, GCP, Heroku, Runpod ✅ CI/CD pipelines for seamless deployment and version control ✅ Dockerized application environments for scalability and flexibility 🥇Workflow Automation & Integrations: ✅ Expertise in workflow automation using n8n and Zapier ✅ API integrations across third-party services (CRM, ERP, payment gateways, etc.) ✅ Automating business processes, notifications, and data pipelines 🥇Why Choose Me? - 🌟 7+ Years of Experience delivering top-notch solutions - 🎯 Results-Driven Approach: Every project is tailored to meet specific business needs - 🤝 Reliable Communication: Transparent updates and client-first collaboration - 💡 Innovation-Focused: Staying at the forefront of tech trends to offer modern solutions If you're looking for a skilled full-stack developer who can handle everything from frontend interfaces to backend infrastructure—and even cutting-edge AI chatbot development—let’s connect! Click "Hire Now" to start our journey toward creating exceptional solutions for your business. 🚀