💡 I help businesses fix, modernize, and scale real-world .NET applications while building secure, high-performance systems from end to end. With 10+ years of experience, I’ve delivered enterprise platforms, SaaS products, APIs, and identity solutions across multiple industries. My strength is working on complex production systems — improving performance, reducing technical debt, and safely evolving legacy applications into modern architectures. I combine full-stack development expertise with deep knowledge of enterprise authentication (SSO/SAML) to deliver secure and scalable solutions. 🚀 What I Can Help You With ✔ Maintain and enhance existing ASP.NET / ASP.NET Core applications ✔ Build scalable SaaS platforms and enterprise web apps ✔ Develop secure REST APIs and microservices ✔ Implement SSO, SAML, OAuth, and identity integrations ✔ Modernize legacy WebForms / MVC apps to ASP.NET Core ✔ Optimize SQL Server and application performance ✔ Integrate third-party APIs and cloud services ✔ Deliver responsive UI with modern frontend frameworks 🔧 Core Technical Expertise 👉 Backend & Architecture ASP.NET Core, MVC, Web API, WebForms (maintenance & migration) C#, .NET Framework, .NET 6/7/8 Entity Framework / EF Core, LINQ Clean Architecture, SOLID principles Microservices & distributed system design 👉 Identity & Security (Key Differentiator) SSO & SAML implementations OAuth2 / OpenID Connect / JWT IdentityServer, Azure AD, Auth0 integrations Secure enterprise authentication & authorization 👉 Frontend Development Angular, React, Blazor JavaScript, jQuery Bootstrap & responsive UI Telerik, Kendo UI, DevExpress 👉 Databases & Performance SQL Server (query tuning, indexing, optimization) Stored procedures, migrations & refactoring Performance debugging in production systems 👉 Cloud, Tools & Integrations Azure-ready applications & IIS deployments AWS integrations (EC2, S3 – working level) Git, TFS, SVN Payment gateways, Google APIs, third-party integrations XML / JSON integrations & automation workflows ⭐ Why Clients Work With Me ✅ Strong debugging skills in complex legacy systems ✅ Clean, scalable, production-grade code ✅ Fast understanding of existing codebases ✅ Clear communication & proactive delivery ✅ Long-term modernization mindset I focus on solutions that increase stability today and scalability tomorrow. 🎯 Typical Projects Legacy .NET modernization SaaS platform development API ecosystems & integrations Enterprise SSO / identity solutions Performance tuning & architecture improvements 🕓 Availability • 40 hrs/week • Flexible across US, UK, EU & AU timezones • Open to long-term collaborations 🤝 Let’s Connect If you need a senior developer who can own complex systems, communicate clearly, and deliver secure scalable solutions, I’d be happy to help. 🔷 If your application is slow, fragile, or difficult to maintain, I can step in, understand it quickly, and improve it safely. 👉 Send an invite and let’s discuss your project. 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀 Senior .NET Engineer, ASP.NET Core, ASP.NET MVC, WebForms, C#, SQL Server, Performance Optimization, Legacy System Modernization, API Development, AI Integration, Azure, IIS, Entity Framework Core, Database Optimization, Migration, SignalR, Blazor, Angular

If your .NET system is slow, unstable, hard to maintain, or blocking business growth - I fix that. I help businesses rescue, modernize, and scale legacy .NET applications without disrupting ongoing operations. Most of my clients reach out when: - Their legacy system is crashing, slow, or insecure - Developers left and nobody understands the code - Compliance audits (HIPAA / PCI-DSS) are failing - The system can’t scale with users or business demand - They want to modernize without a risky full rewrite With 8+ years of experience, I’ve helped companies in Healthcare, FinTech, ERP, POS, and HRMS turn fragile legacy systems into secure, cloud-ready platforms used by thousands of users daily. ✅ What I Can Do for You - Stabilize and refactor legacy .NET / ASP .NET applications - Modernize WebForms or MVC apps into clean, scalable architectures - Migrate systems to .NET Core / .NET 6–8 and Azure - Fix performance bottlenecks and security vulnerabilities - Design compliance-ready systems (HIPAA, PCI-DSS, HL7/FHIR) - Build new systems the right way using Clean Architecture 💡 How I Work (and Why Clients Keep Me) - Clarity first - I break complex systems into simple, business-friendly plans - No surprises - Milestone-based delivery with clear progress visibility - Production-ready quality - Clean, maintainable, documented code - Post-delivery support - Free bug fixes for 1 week after delivery - Partner mindset - I challenge bad decisions and suggest better solutions 🛠 Core Tech Backend: C#, .NET Core 6/7/8, ASP .NET MVC, Web API Frontend: Angular, Blazor, Razor, WebForms, React Cloud: Azure, Azure Functions, Docker, Kubernetes Architecture: Clean Architecture (CQRS + DDD), Microservices Security: JWT, OAuth2, HIPAA, PCI-DSS Databases: SQL Server, PostgreSQL, Cosmos DB 📩 Not Sure Where to Start? Send me: - A short description of your system - What’s currently broken or limiting growth I’ll analyze your setup and provide a clear solution roadmap free of cost, even if we don’t end up working together. 👉 Click “Invite to Job” and let’s fix this properly.

I have more than 18 years of work experience in the Information Technology field covering software development, system analysis and software quality control and I have worked during this period on many projects in the middle east, UK, USA and Australia. In addition to that I got MSc in Web Technology. Main skills are; SharePoint Online, ASP.NET MVC, .NET core, Power Apps, MS Flow, Copilot Agents and more.

I’m an experienced ERP/POS Developer and SaaS Product Specialist with a strong focus on building scalable, automation-driven systems for businesses. I specialize in designing and developing end-to-end solutions that streamline operations, improve efficiency, and support business growth. With hands-on expertise in ERP systems, POS applications, and SaaS platforms, I have worked on projects involving inventory management, billing systems, user roles/permissions, reporting dashboards, and multi-tenant architectures. I also bring solid experience in Microsoft 365 integrations, including SharePoint, Power Automate, Teams, and Outlook workflows helping businesses automate internal processes and improve collaboration. In addition, I work extensively with n8n automation, creating powerful workflows that connect different tools (CRMs, payment systems, APIs, messaging platforms like WhatsApp) to automate repetitive tasks and enhance customer journeys. Key Skills & Expertise: ERP & POS system development (custom modules, integrations, reporting) SaaS product architecture (multi-tenant systems, scalability, API design) Microsoft 365 (Power Automate, SharePoint, Teams integrations) n8n workflow automation (API integrations, triggers, webhooks) Payment integrations (Stripe, PayPal, Razorpay) Clean UI/UX dashboards and admin panels I focus on delivering clean, secure, and scalable solutions with proper documentation and long-term maintainability. If you're looking for someone who can build, automate, and scale your systems efficiently, I’d be happy to collaborate.

⭐️ 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 ⭐️ 1𝟎𝟎+ 𝐂𝐮𝐬𝐭𝐨𝐦 𝐖𝐞𝐛 & 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩𝐬 𝐃𝐞𝐥𝐢𝐯𝐞𝐫𝐞𝐝 | 16+ 𝐘𝐞𝐚𝐫𝐬 𝐨𝐟 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 | 𝐇𝐞𝐥𝐩𝐞𝐝 𝐒𝐭𝐚𝐫𝐭𝐮𝐩𝐬 𝐁𝐮𝐢𝐥𝐝 𝐟𝐫𝐨𝐦 𝐒𝐜𝐫𝐚𝐭𝐜𝐡 | 𝐅𝐫𝐞𝐞 𝐂𝐨𝐧𝐬𝐮𝐥𝐭𝐚𝐭𝐢𝐨𝐧 𝐁𝐞𝐟𝐨𝐫𝐞 𝐏𝐫𝐨𝐣𝐞𝐜𝐭 Client Testimonial: Project: 𝐂𝐑𝐌 𝐚𝐧𝐝 𝐏𝐌𝐒 𝐬𝐲𝐬𝐭𝐞𝐦 "Dev is easy to work with and very available. His work is of highest quality. I really appreciated his understanding of my needs and his ability to turn my needs and requirements into a useful and effective database." Do you struggle with manual processes, disconnected systems, or outdated software? I build and modernize custom CRM, ERP, and workflow systems with .𝐍𝐄𝐓, 𝐌𝐄𝐀𝐍, and 𝐌𝐄𝐑𝐍 stacks to boost efficiency, accuracy, and long-term scalability. Projects are delivered on time, within budget, and built for long-term scalability. 𝐌𝐲 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐀𝐩𝐩𝐫𝐨𝐚𝐜𝐡 𝐟𝐨𝐫 𝐏𝐫𝐨𝐣𝐞𝐜𝐭 𝐃𝐞𝐥𝐢𝐯𝐞𝐫𝐲: I start by fully understanding client workflows, then break the system into clear modules and development sprints. I follow an iterative approach with weekly updates, live demos, and early feature access, allowing feedback to be incorporated quickly. Industries I’ve worked with: 🩺 𝐇𝐞𝐚𝐥𝐭𝐡𝐜𝐚𝐫𝐞: HIPAA-compliant EMRs, telemedicine platforms, patient portals 🏭 𝐌𝐚𝐧𝐮𝐟𝐚𝐜𝐭𝐮𝐫𝐢𝐧𝐠: Production planning, inventory management, quality assurance systems 🚧 𝐂𝐨𝐧𝐬𝐭𝐫𝐮𝐜𝐭𝐢𝐨𝐧: Cost estimation, project scheduling, asset management tools 📈 𝐅𝐢𝐧𝐚𝐧𝐜𝐞: Financial planning, accounting, and risk management solutions 🎓 𝐄𝐝𝐮𝐜𝐚𝐭𝐢𝐨𝐧: LMS platforms, student management systems, assessment tools 🏢 𝐈𝐧𝐬𝐩𝐞𝐜𝐭𝐢𝐨𝐧: Asset management and quality control solutions 📦 𝐈𝐧𝐯𝐞𝐧𝐭𝐨𝐫𝐲: Order management, demand forecasting, warehouse management systems P.S. My complete skillset includes the following skills: ✅ Frameworks / Libraries: Dot NET, Dot NET Core, ASP Dot NET, ASP Dot NET MVC, Web API, Angular, React, Redux, Vue.js, Bootstrap, jQuery, Docker ✅ Frontend Technologies: Angular.js, React.js, Vue.js, Angular (latest), HTML5, CSS3, TypeScript, JavaScript ✅ Databases: MSSQL, MySQL, PostgreSQL, SQLite, MongoDB, CosmosDB ✅ Cloud Platforms: Azure (App Service, Functions, Active Directory, API Management, Text-to-Speech, Speech-to-Text, LUIS, Cognitive Search, Logic Apps), AWS (EC2, S3) ✅ Mobile Development: Xamarin. Forms, .NET MAUI, React Native ✅ DevOps / CI-CD: Bitbucket Pipelines, Visual Studio Online, Docker Cloud, Kubernetes (basic) ✅ Project Management & Collaboration: Asana, JIRA, Trello, Bitbucket, GitHub, Beanstalk ✅ Testing Frameworks: TDD, BDD, Cypress, NUnit, Selenium ✅ AI tools: Microsoft ML Dot Net, Azure AI, Copilot, OpenAI, Chatbots, LUIS Let’s Chat! Book a 𝐟𝐫𝐞𝐞 𝟑𝟎-𝐦𝐢𝐧𝐮𝐭𝐞 𝐜𝐨𝐧𝐬𝐮𝐥𝐭𝐚𝐭𝐢𝐨𝐧 to discuss your CRM, ERP, workflow automation, or custom software project. I’ll help you define the right architecture, timeline, and execution plan. If you are looking for a custom software developer with the skills and experience to help your business grow, don't hesitate to get in touch. I would be happy to discuss your requirements and help you achieve your business goals. Best regards, Devinder Keywords Clients Use to Find Me: Custom Software Developer | Full Stack Developer | CRM Developer | ERP Developer | Dot NET Developer | ASP Dot NET Developer | Angular Developer | React Developer | MERN Stack Developer | SaaS Developer | Workflow Automation | Telemedicine App Developer | HIPAA-Compliant App Developer | Business Applications | Enterprise Software | Healthcare Software | Manufacturing Software | Financial Systems | Inventory Management | API Development | Custom Web Applications | Frontend Development | Backend Development | Node JS API Development | React Native Mobile Apps

Full Stack Developer | ASP.NET Core · Azure and Javascript Expert | 8 years building production SaaS and FinTech platforms. My recent projects are: → eventio: AI-powered event management (.NET 8, React, Next.js, Azure OpenAI) → approvpay: FinTech SaaS with Stripe and QuickBooks (Angular, .NET Core, NgRx) → ruleonetoolbox: Real-time stock data platform (.NET 6, Angular, Azure Functions) → findd: Payroll and time-attendance SaaS (.NET Core, React, ServiceNow, MongoDB) What I build: .NET Backend & REST API Development ASP.NET Core Web APIs and Microservices using Clean Architecture, CQRS, and MediatR. Entity Framework Core, SQL Server, PostgreSQL, and MongoDB. Tested with xUnit and TDD — not added at the end. Full-Stack SaaS Development End-to-end platforms with React, Angular, Next.js, and TypeScript frontends connected to .NET backends. NgRx and Redux for state. Production-ready, not just demo-ready. Azure Cloud & DevOps Azure App Services, Functions, Key Vault, Service Bus, and Azure AD. CI/CD with Azure DevOps and GitHub Actions. Docker containerisation from day one. AI Integration Azure OpenAI and OpenAI API wired into live .NET applications — already shipped, not proof-of-concept. Third-Party Integrations Stripe, QuickBooks, SAP, ServiceNow, and Azure AD. Complex integrations handled end-to-end. Testing & Code Quality TDD, xUnit, Selenium, and integration testing baked into the process — not added at the end when it's already broken. Stack: Backend: C# · ASP.NET Core · .NET 8 · SignalR · Microservices · CQRS · MediatR · Clean Architecture Frontend: React · Angular · Next.js · TypeScript · NgRx · Redux Databases: SQL Server · PostgreSQL · MongoDB · CosmosDB · Entity Framework Core · Dapper Cloud & DevOps: Azure · Docker · CI/CD · Azure OpenAI · Azure DevOps · GitHub Actions Integrations: Stripe · QuickBooks · SAP · ServiceNow · Azure AD If you're building a .NET SaaS platform, FinTech product, or AI-integrated web application — send me the brief.

✅ TOP RATED PLUS on Upwork ✅ 18+ Years of strong experience with 5-Star Feedback ✅~21,000 + hours on Upwork ✅~45+ Long-Term Relationship Projects on Upwork ✅ 5.0 star ratings certified by Upwork ✅ 100% Client Satisfaction & Recommendation ✅ Web and BI development ✅Artificial Intelligence & Machine Learning * Experience: 17+ years * Deep knowledge of ASP.NET MVC 5+ * Advanced experience with HTML5 /CSS3 * Deep knowledge of JavaScript, jQuery ,SignalR , React JS , AngularJS * Experince with API using JSON , XML * Knowledge of C#, .NET Framework 4.0+ , ADO.NET * Entity Framework (or similar ORM) * MVC – javascript frameworks (knockout, angular) * Deployment of AZURE , CLOUD SERVER , RACKSPACE * BI Tools - MS BI , SSIS,SSAS,SSRS , Power BI , Jasper Report , Tableau , Qlik Sense . * WEBSOCKET development * Very good industry's practical expereince for SQL , T- SQL , SQL Concepts ,writing complex queries , performance analysis for huge databases , SQL Programming like Store procedures ,views,functions ,SQL Jobs, experience in relational database design * Strong expereince on BI TOOL like MSBI,Tableu,Metabase,Power BI * Third party controls TELERIK , DEVXPRESS I have 17+ years of experience in analysis, design and development of various websites, web applications , desktop applications and Web based ERP Products for Logistics, Transports,Accounts & Retail. ERP Domain Experience (SAP,MS Dynamics AX,EPICOR,INFOR,SAGE,Acumatica) • ERP-Transport /Logistics Management System • Banking Application • HealthCare Management • Insurance Domain • ERP-Supply Chain Management. • ERP-Warehouse Management System • ERP-Retail Management System • ERP-Packers & Movers • ERP-Finance & Accounts • ERP-Transport Management System • MRP – Pharma Manufacturing • MRP – Textile & Diamond Manufacturing I have developed very challenging work in SQL & ASP.NET . Our system is easy to use and flexible with many advanced features .Our reports have unique impression on management or users . I am seeking a good chance to prove my self in more detail to make a process easy for your business . Thank you

I am a Senior Software Engineer specialized in .NET Framework with 7+years of work experience in Full Stack .NET Development. I have worked with large enterprise clients on designing & developing solutions that leverage their data and turn it into intelligent solutions. Technical Skills and Abilities Areas of Expertise: Web Designing Web Apps Development Solution Architect Project Management System Development Life Cycle Methodology Agile Methodology Enterprise Application Development Research and Development Skills & Technologies: C# ASP. NET MVC Entity Framework .NET Framework Angular Js MSSQL REST API API Development API Integration Web Services API Cross-platform Development Xamarin N-Tire Architecture Db Log Architecture Html CSS JavaScript jQuery Bootstrap Duties & Other Skills: Having the capability of designing and developing the complete Enterprise Application alone. Possess excellent interpersonal, leadership, communication, and analytical skills with proven customer handling abilities with a primary focus on quality. Able to deliver reliable code without any supervision. Having a responsible attitude, and possessing superb decision-making skills. Promoting good work practices. Always ready to work on new ideas and products. Assigning tasks to staff/team members & clearly explaining how those duties are to be done. Excellent Verbal and Communication skills that also help team members to achieve results fast and efficiently. I am a self-driven individual with the ability to adapt to any situation and proven potential to grow myself and others. Never hesitate to move towards new technologies and learn new methodologies within no time. Willing to take ownership of core components. My goal is to grow as a person and as a professional with my clients.

Software Developer with 20 years overall experience located in Orlando, FL. Experienced in C#, ASP .Net MVC, ASP .Net Webforms, SQL Server, T-SQL, Angular, TypeScript, Kendo, EFCore, VB, JavaScript, jQuery, HTML, Entity Framework, Azure, PHP. Dedicated, hard worker determined to get your project complete in the most efficient and cost-effective manner.

As a full-stack .NET developer with years in fintech, I build robust websites, management systems, reporting platforms, APIs, and payment gateways using .NET Core, Angular, React, and the Microsoft stack. I specialize in secure, scalable solutions that drive revenue delivering award-winning projects like the fslgroup com Logistic Benefit Virtual Wallet with Stripe/PayPal recurring payments. Why Clients Choose Me: ✔Proven Results: Architected fintech platforms handling high-volume transactions reduced deployment time by 40% via Azure/AWS cloud migrations. ✔End-to-End Delivery: From concept to maintenance, ensuring security, performance, and compliance. ✔Agile Collaboration: 100% on-time delivery using JIRA, Azure DevOps, or your preferred tools. Core .NET & Fintech Expertise ✔Custom ASP.NET Core/MVC/Blazor apps, Minimal APIs, ABPio ✔Payment integrations (Stripe, PayPal recurring billing, 3rd-party gateways) ✔Full-stack fronts (Angular, React JS, Bootstrap/Material UI) ✔Microservices, SignalR real-time, REST/Web API/WCF ✔Cloud/DevOps: Azure/AWS (ECS, EKS, Kubernetes, Docker), CI/CD pipelines ✔Databases: SQL Server, Cosmos DB, MongoDB, Redis, RabbitMQ, EF Core/Dapper Business Solutions Delivered ✔Fintech platforms & virtual wallets (e.g. fslgroup com) ✔HRM/HRIS, Payroll, Employee Management ✔Supply Chain (SCM), Inventory Control ✔EMR/EHR systems ✔PoS, Online Ordering ✔ERP/CRM with API integrations ✔Reporting dashboards & BI tools ✔Legacy Asp NET migrations Project Management Tools I Use ✔Upwork Message Board, Zoom ✔JIRA, Azure DevOps, Asana, Trello ✔GitHub/GitLab CI/CD Ready to scale your fintech project? Let's discuss your needs!