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I am Mahadevan Muthirakumaran, a seasoned Windows application developer with over 8 years of experience specializing in .NET and WinForms development. My expertise includes working with DevExpress, ComponentOne, and native controls, and I have a strong command of SQL Server and MySQL, consistently adhering to design patterns, coding best practices, and building high-performance, optimized applications. Key Projects: Radio Automation System – Designed and developed a scheduling-based audio track playback system for radio stations. Recording & Editing Tool – Built a user-friendly interface for recording and editing audio tracks, optimized for speed and accuracy. Audio Tracker – Engineered an audio comparison tool to detect commercial content differences between two radio streams. Spec5 (ProjectMatrix) – Developed a custom spreadsheet-style application tailored for the manufacturing industry to handle complex data structures. I am currently exploring new opportunities in WinForms-based development with SQL Server or MySQL backends. I'm particularly interested in roles where I can contribute to building efficient desktop applications that are robust, maintainable, and user-friendly. If you’re looking for someone with a proven track record in Windows application development, I’d welcome the chance to discuss how I can add value to your team. With warm regards, Mahadevan Muthirakumaran

Available to start immediately. I build and fix real .NET & C# software. Click on Invite button to start conversation I’m a .NET Developer and C# Developer with 13+ years of experience working on production systems built in C#/.NET. Most of my work is focused on helping teams make their existing software more stable, scalable, and easier to evolve without risky rewrites. I’ve worked in long-term roles as a C#/.NET developer, often joining projects where the codebase already exists and needs structure, performance improvements, or careful modernization. 🧠 How clients usually come to me Very often, teams reach out to me as a .NET developer when they already have a product written in C#/.NET, but something isn’t working as it should. Changes are slow, bugs appear in unexpected places, or the architecture feels fragile. In those cases, I step in as a C# .NET Developer who understands how real systems grow over time and how to improve them without breaking production. Depending on the scope, I work either as a backend developer focused on logic and performance, or as a .NET Full Stack Developer when both backend and UI decisions need to be handled together. ⚙️ What I do in real projects Day to day, my work as a .NET Developer is very practical. I write and refactor C#/.NET, clean up .NET architecture, improve async flows, and make sure the application behaves predictably in production. In many projects, this naturally turns into .NET full stack work handling backend services, APIs, and UI integration where I step in as a .NET Full Stack Developer. When teams want a modern .NET Full Stack direction without splitting the codebase, I build new features or full applications using .NET MAUI/WPF/WinForms. I’ve worked with .NET apps both for new products and for migrations from older stacks like, where stability matters more than speed. 🧩 Types of systems I’ve worked on Over the years, I’ve worked as a .NET Developer, across different environments: 💻 Desktop software written in C#/.NET 🌐 Web platforms where I worked as a full stack developer on .NET backends 📱 Cross-platform apps built with .NET MAUI (Windows & Android only) 🧱 Larger products that required a true full stack developer approach 🔗 Mixed systems where .NET AI integration was part of the stack 🎮 Internal tools and simulators developed with C# 🤖 Careful use of .NET AI where it actually added value In several projects, I worked in React .NET setups, connecting React frontends to .NET backends while keeping responsibilities clean and clear. 🛠️ How I work with teams and data I’m comfortable joining existing teams and reading unfamiliar C#/.NET codebases. I focus first on understanding why decisions were made, then improving things step by step. I regularly work with SQL server, collaborate with Azure Data Engineer roles, and support data-heavy systems where performance & reliability are critical. This mix of responsibilities often places me in a .NET Full Stack Developer role even when the original task starts as pure backend work. 🛠️ Tech Stack .NET Framework, .NET 6 / 8 / 9 / 10 App Development - WPF, WinForms, WinUI, Blazor, .NET MAUI, MVVM Concurrency & Performance - Multithreading, async/await, Task Parallel Library Hardware & Protocols - Serial, Bluetooth LE, TCP/IP, UDP, RS232, RS422 Architecture & Quality - Clean Architecture, OOP, refactoring, performance tuning Security & Testing - Unit testing, Polaris, Coverity, SAST, DAST, threat modeling Data & Cloud - SQL Server, Azure Tooling - Visual Studio, VS Code, GitHub, GitHub Actions, Docker ✅ Why clients choose to work with me ✨ I think like a long-term .NET Developer, not a short-term task runner ✨ I write C# code that other C# developers can actually maintain ✨ I’m comfortable owning systems as a .NET Full Stack Developer ✨ I communicate clearly and avoid surprises ✨ I leave .NET full stack codebases cleaner and more stable than I found them 📌 Availability ✅ Available now 🌍 Remote-only ⏱️ Open to long-term collaboration If you’re looking for a .NET Developer, who can step into an existing system and improve it safely let’s chat. 👉 Send a message and we’ll review your setup together.

Looking for a Full-Stack .NET Developer, AI Specialist, and Automation Engineer who handles everything from complex backend architecture to sleek React frontends and CAD plugins? Finding a reliable developer is hard; finding a Product Engineer who understands system design, automated workflows, and business ROI is even rarer. I bridge that gap by combining deep technical expertise with a consultative mindset. Whether you need custom AI/ML integrations, SolidWorks CAD automation, or high-throughput .NET enterprise platforms, I engineer solutions built on Clean Architecture, microservices, and Test-Driven Development (TDD) to ensure scalable, maintainable, and cost-effective code. What I Build & Automate: AI & Computer Vision Systems: Custom Machine Learning pipelines, RAG (Retrieval-Augmented Generation) applications, and real-time OpenCV image/video processing. CAD & Desktop Automation: Custom SolidWorks API plugins (C#/.NET), Office Add-ins (VSTO & Office.js for Outlook, Excel, OneNote), and WPF desktop tools. Full-Stack Web & APIs: High-performance RESTful APIs, asynchronous microservices, and modern, responsive React dashboards. Core Technical Stack & Expertise AI, Machine Learning & Data: Python, OpenCV (Computer Vision), RAG / LLM Integration, Machine Learning Models, Apache Airflow, Streamlit CAD & Extension Engineering: SolidWorks API (C#), VSTO, Office.js, Outlook & Excel Add-ins, System Automation Backend & Cloud Architecture: C#, .NET 8 / .NET Core, FastAPI, PostgreSQL, SQL Server, Microservices, RESTful APIs Frontend & Mobile: TypeScript, JavaScript, React, .NET MAUI, WPF, Modern UI/UX DevOps & Infrastructure: Microsoft Azure, Docker, Apache Kafka, CI/CD Pipelines, Git Digital Wallet Integrations: Apple Wallet Pass, Google Wallet API I pride myself on transparent Agile communication and delivering logic that is as clean as it is powerful. Let’s connect to discuss your project requirements and turn your technical vision into a production-ready reality.

Need an experienced Microsoft 365 engineer who can jump into your MSP environment, resolve tickets quickly, and communicate professionally with end users? I currently support U.S.-based businesses, handling Microsoft 365 administration, Exchange Online, Entra ID, Intune, Azure, VPN, and Windows support in an SLA-driven MSP environment. I have hands-on experience supporting Microsoft 365 environments, assisting end users, and resolving technical issues across Exchange Online, Entra ID, Intune, Azure, and Windows systems. Microsoft 365 Administration ✔ User onboarding & offboarding ✔ License assignment & management ✔ Shared mailbox management ✔ Mailbox permissions & delegate access ✔ Distribution Lists & Microsoft 365 Groups ✔ Password resets & MFA troubleshooting ✔ User provisioning & deprovisioning Exchange Online ✔ Message Trace ✔ Mail flow troubleshooting ✔ Spam & phishing investigations ✔ Quarantine management ✔ Email forwarding & mailbox configuration ✔ Outlook & Exchange troubleshooting Entra ID (Azure AD) ✔ User & Group Management ✔ MFA configuration & reset ✔ Identity troubleshooting ✔ Access management ✔ Conditional Access (basic support) Intune & Endpoint Support ✔ Device enrollment ✔ Device compliance troubleshooting ✔ Windows device management ✔ Endpoint support Azure & Infrastructure ✔ Azure VM basic administration ✔ VPN connectivity troubleshooting ✔ DNS & DHCP troubleshooting ✔ Windows administration PowerShell ✔ Microsoft 365 administrative tasks ✔ Exchange Online PowerShell ✔ User management automation MSP Helpdesk Support ✔ Remote troubleshooting for end users ✔ Ticket management & documentation ✔ SLA-focused support ✔ Escalation when required ✔ Root cause investigation ✔ Clear communication with users and clients Tools & Technologies Microsoft 365 • Exchange Online • Entra ID • Intune • Azure • PowerShell • Windows Server • VPN • NinjaOne • Microsoft Defender • Outlook • Teams • SharePoint I believe great IT support isn't just about closing tickets—it's about solving problems correctly, communicating clearly, and preventing the same issues from happening again. If you're looking for a dependable Microsoft 365 Support Engineer who can become a valuable part of your MSP or internal IT team, I'd be happy to discuss your project. Availability ✔ Comfortable working US & UK business hours ✔ Available for long-term contracts ✔ Quick response time ✔ Professional communication ✔ Ready for trial tasks or ongoing support

I am an experienced IT Infrastructure Engineer with 15+ years of hands-on expertise in designing, deploying, and managing enterprise IT environments. My specialization includes Windows Server, Active Directory, Hybrid AD with Entra ID, Microsoft 365, Exchange Server, Azure, AWS, and Virtualization. I help businesses modernize their IT infrastructure end-to-end — from on-premises servers and virtualization platforms (VMware/Hyper-V) to hybrid cloud integrations, Azure AD/Entra ID deployments, and modern desktop architecture. I focus on delivering secure, scalable, and resilient hybrid IT solutions that enhance productivity, security, and compliance while supporting business growth. Technical Expertise 🗄️ Windows Server & Active Directory ✅ Install, configure, and manage Windows Server 2003–2025 ✅ DFS, DNS, DHCP, RDS, IIS, RAID, NAS ✅ Group Policy Objects (GPOs), AD replication, backup & restore ✅ Active Directory migrations & consolidations (domains/forests) ✅ Identity Services: ADFS, Azure SSO, MFA, SAML, OAuth, OpenID ✅ AD Security Auditing: BloodHound/SharpHound, Kerberoasting, ZeroLogon ☁️ Microsoft 365 & Cloud Services ✅ Administration of Exchange Online, SharePoint, OneDrive, Teams ✅ Domain & DNS setup: SPF, DKIM, DMARC, MX ✅ Security & Compliance: Defender for Endpoint & O365, DLP, Conditional Access, Sensitivity Labels, Azure Security Policies ✅ Tenant-to-tenant migrations: BitTitan, CodeTwo, SkyKick ✅ Hybrid Deployments: Exchange + O365, ADFS, Azure AD/Entra ID Connect ✅ Modern Workplace Management: Intune, Autopilot, Co-management, Windows 10/11, Windows 365/Cloud PC 🏢 Virtualization & Cloud Platforms ✅ VMware: ESXi, vCenter, vMotion, DRS, HA, NSX, vSAN, vROps ✅ Hyper-V: deployment, migration, clustering, Azure Stack HCI ✅ Azure Virtual Machines | VM Scale Sets | Availability Sets & Zones | ARM Templates | NSGs | Azure Bastion | Load Balancer | Azure Monitor | Backup & Site Recovery | Automation & Auto-Scaling | Hybrid VM Integration | High Availability | Cost Optimization ✅ AWS: IAM, EC2, S3, CloudFormation, cloud migrations 🔒 Security & Vulnerability Management ✅ Penetration testing & vulnerability scanning (Nessus, Qualys, Kali Linux) ✅ Remediation of Windows & AD vulnerabilities (SMB, PrintNightmare, LDAP signing) ✅ Zero Trust Security implementation & Identity Governance ✅ Backup & disaster recovery (StorageCraft, NAS, SkyKick, Quest Recovery Manager, DRaaS) ⚡ Automation & RMM Tools ✅ PowerShell scripting & DSC automation ✅ Graph API & Microsoft 365 automation ✅ RMM tools: Intune, Datto RMM, ConnectWise, NinjaOne, ManageEngine ✅ Endpoint management, application deployment & compliance 📞 Collaboration & Messaging ✅ Teams Phone System & Direct Routing ✅ Exchange Hybrid Architecture & migrations ✅ PBX integration 🏆 Why Work With Me / Achievements / Key Results 🏅 Upwork Top-Rated Expert – recognized for delivering high-quality IT infrastructure and cloud solutions 🏅 Certified IT Infrastructure Expert – Microsoft, Azure, AWS, VMware, and Security certifications 🏅 23K+ hours worked – extensive hands-on experience with diverse enterprise projects 🏅 $400K+ earned – proven track record of client satisfaction and successful project delivery 🏅 Enterprise & Cloud Expertise – implemented hybrid AD, Azure, Microsoft 365, VMware, and AWS solutions for multiple organizations 💡 Online Consultation Available ⭐ Review your IT environment ⭐ Identify challenges & solutions ⭐ Create a custom step-by-step action plan 📅 Schedule your consultation directly on Upwork at your convenience. Whether you need full project delivery or expert guidance, I ensure your IT infrastructure is secure, efficient, and optimized for growth.

✅ 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