If you're building a SaaS platform, modernizing a legacy .NET system, or need an experienced architect who can design multi-tenant applications that are secure, scalable, and maintainable you're in the right place. I'm Mayur, a Microsoft Certified .NET Full Stack Developer with 12+ years of experience building enterprise-grade web applications. I specialize in ASP. NET Core, C#, SQL Server, Azure, and AWS with deep expertise in multi-tenant SaaS architecture, microservices, and complex authentication systems using AWS Cognito, Lambda Authorizers, Identity Server 4, and JWT-based RBAC. What I specialize in: 1. Multi-Tenant SaaS Development -- Built from-scratch multi-tenant platforms with per-tenant configurations, Temporal-based workflow orchestration, and real-time data sync across locations. 2. Authentication and Authorization -- AWS Cognito, Lambda Authorizers, Identity Server 4, OAuth2, JWT. Designed auth layers for applications serving thousands of concurrent users across different roles and tenants. 3. Workflow Automation -- Temporal based durable workflows, Hangfire background jobs, AWS SNS/SQS event pipelines. If your business has manual processes that belong in code, that's where I come in. 4. API Development and Integrations -- RESTful APIs, third-party integrations (Stripe, HubSpot, Gmail, Twilio, OpenDental, NexHealth), and cloud-native backends on Azure and AWS. 5. Legacy Modernization -- Upgrading older ASP. NET / .NET Framework systems to maintainable, modern .NET Core solutions without disrupting ongoing operations. Industries I've worked in: Healthcare / Dental PMS -- GovTech / Advocacy -- FinTech / Real-Time Trading -- Real Estate CRM -- EdTech / LMS -- Pharma / Patient Tracking -- E-commerce / Review Platforms ==> Technologies I work with: Backend: ASP .NET Core, C#, .NET 8, Web API, Entity Framework, Blazor Database: SQL Server, PostgreSQL, Oracle, Stored Procedures Cloud: Azure (App Services, Service Bus, Application Insights, Functions), AWS (Cognito, Lambda, API Gateway, SNS, SQS, ECS) Security: JWT, OAuth2, RBAC, Lambda Authorizers, Identity Server 4, AWS Cognito Messaging and Jobs: Temporal, Hangfire, Azure Service Bus, AWS SNS/SQS Frontend: Angular, JavaScript, jQuery, Blazor Tools: Git, Swagger, Postman, Docker, Visual StudioWhy clients work with me: ==> Clear communication and organised execution. I work well in structured environments -- Slack standups, sprint planning, Jira or Asana, GitHub PR reviews. Strong backend and architecture thinking. I don't just write code I design systems that hold up as the business scales. Reliable delivery with business context in mind. I understand that behind every technical requirement is a business goal, and I keep that in sight. Practical problem-solving. I can understand your business process, design the right solution, and deliver a maintainable system. AI-augmented development. I use AI tools to accelerate scaffolding, test case generation, and documentation but all outputs are manually reviewed, tested, and refined before delivery. Send me a message with your project goals, your current system challenges, or the workflow you're looking to improve. I'm here to help.

👨‍💻 **Senior Full-Stack Developer | 8+ Years of Experience in Web & Software Development | AI / LLM / OCR Expertise** | Using AI tools, Claude, Antigravity AI, Copilot I help startups and agencies build fast, scalable, and cleanly-coded web apps. Recently built a dynamic quiz system (React + MongoDB) that handles thousands of users with autosave, role-based views, and real-time updates. Specialized in **.NET, SQL, Angular, React, and MERN Stack** – delivering robust, scalable, and high-quality applications for businesses of all sizes. --- ### 🔍 Key Highlights 🟢 High-quality coding standards 🟢 Proven track record across enterprise and startup projects 🟢 Ready to start immediately 🟢 Cloud-ready, performance-optimized solutions 🤖 AI / LLM / OCR Expertise 🧠 Built a custom background text removal tool in Python using OpenCV before ChatGPT was released 🤖 Integrated OpenAI GPT-3.5/4, DALL·E, and Whisper for invoice generation, image handling, and voice-to-text workflows 📚 OCR (Tesseract + OpenCV) for extracting and cleaning up text from scanned documents, invoices, and low-quality images 📄 PDF Reading & Parsing using Python libraries like PyMuPDF, pdfplumber, pdfminer.six — used in automation and AI-driven summarization tools 🧠 Implemented LangChain pipelines with vector databases (Pinecone, Chroma) for document Q&A and semantic search ✨ Smart prompt design, AI flow testing, and fine-tuned interactions for LLM-based apps ### 🖥️ Backend Development - 🧱 Node.js – Express, RESTful APIs - ⚙️ .NET Core / ASP.NET MVC / Web API - 🧠 C#, VB.NET, WPF, XAML - 📊 Microsoft SQL Server, SSRS - 🧩 Entity Framework, LINQ - 📦 Blazor – Server & WebAssembly - 📄 ITextSharp, JSON, XML - 🔌 SOAP, WCF - ☁️ AWS EC2, S3 --- ### 🎨 Frontend Development - ⚛️ React.js, Redux - 🅰️ Angular 8–10, AngularJS - 🔤 TypeScript, JavaScript, jQuery - 🗺️ Google Maps API, Smarty API - 📞 Twilio API - 💡 Responsive Design – Cross-browser and mobile-first --- --- ### 🌐 Cloud & Hosting Platforms ☁️ **Amazon Web Services (AWS)** – EC2, S3 ☁️ **Microsoft Azure** – App Services, VMs, Blob Storage, CDN 🔐 Azure AD, Application Insights 🧩 SQL Azure – Elastic databases ⚙️ Azure Batch & Event Sourcing 💳 Payment Gateway Integrations (Stripe, PayPal, etc.) --- ### 🛍️ CMS & E-commerce - 🧩 WordPress – Custom Theme & Plugin Development - 🛒 NopCommerce – Extension & Integration Expertise --- ### 🤝 Let's Collaborate Whether you're scaling your product, migrating tech stacks, or building from scratch — I deliver results that align with your goals. **Open to part-time, full-time, or milestone-based projects.** -------------------------------------------------- Keywords: Full-Stack Developer, React Developer, Node.js Expert, .NET Developer, MERN Stack, Angular Developer, Vue.js, TypeScript, JavaScript, MongoDB, SQL Server, AWS, Azure, API Development, E-Commerce Development, SaaS Development, Enterprise Applications, Web Application Development, Frontend Development, Backend Development, Database Design, Cloud Solutions, Performance Optimization

I have more than a decade of experience working with a wide range of technologies in the .NET ecosystem, allowing me to tackle complex challenges efficiently, and I have excellent communication skills, and excellent English. Strong Skill Set: My expertise spans multiple areas, including: Backend Development: .NET, .NET Core, REST API, ASP.NET MVC, WCF, Razor Pages Frontend Development: Angular, TypeScript, HTML, CSS, JavaScript Cloud and Integration: Azure DevOps, Logic Apps, Azure Service Bus, Azure Functions, Azure Search, RabbitMQ, BizTalk for enterprise integration Database Management: SQL Server, MongoDB, MySql, Postgress Web Services: REST API, SOAP Services Content Management: Umbraco CMS Desktop Applications: Windows Application, WPF Excellent Communication Skills: I believe that effective communication is key to successful project outcomes, and I am committed to maintaining clear and open lines of communication throughout our collaboration. I am passionate about leveraging my technical skills to drive innovation and efficiency within your company. I am particularly interested in contributing to projects that aim to enhance user experiences, streamline processes, and optimize system performance. I would be delighted to discuss how my skills and experience align with your company's goals. Please feel free to reach out if you have any questions or need further information about my background. I would be delighted to discuss how my skills and experience align with your company's goals

I'm Parth, a senior Microsoft and Azure certified and full-stack engineer who lives and breathes Microsoft Eco-system with Azure and Node.Js, Angular and React. Over 10 years, I've shipped 50+ production apps and logged 10K+ hours with different platforms, helping startups and enterprises launch fast, scalable and reliable products. Backend APIs and Microservices - .Net and Node with SQL, PostgreSQL, MySQL, Azure CosmosDB, MongoDB, Redis, Azure service bus queues Frontend - Modern React, Angular and Next.JS UIs that load faster and feel smooth on every devices AI Integrations - Claude MCPs, AI Agents, AI workflows, LLM workflows and ML pipelines that add real intelligence Cloud & Ops - Docker, CI/CD, Azure & AWS (Zero downtime deployments), Cost-optimized I value clean architecture, thorough testing, and proactive communication across time zones. If you need a developer who can own the entire stack, infuse AI capabilities, and deliver on time with AI capabilities let’s talk.

When a business has a complex .NET system nobody else wants to touch, or needs a Knack application built properly from scratch - that's usually when they find me. I've been building software for 18 years. My work sits at the intersection of two things most developers handle separately: low-code platforms like Knack (where I can build and customize fast using Knack API, JavaScript, and CSS), and deep backend .NET work - ASP.NET Core, Web API, Entity Framework, legacy systems that need rescuing, and pipelines that need untangling. I've done this across Healthcare, Real Estate, Oil & Gas, E-Commerce, Media, and ERP/CRM platforms, so chances are I've seen a version of your problem before. On the AWS side, I work regularly with Lambda, API Gateway, SQS, SNS, SES, EventBridge, and DynamoDB - building serverless architectures that scale without drama. I also have solid experience with React on the frontend and Node.js for backend services, and I've integrated payment systems (Square), Google Ads API (campaign automation, AdSets, Merchant Center), and a wide range of third-party REST APIs. Where I add the most value: - Knack app development, customization, and API integration - ASP.NET Core / .NET Framework - new builds and legacy fixes - AWS serverless architecture (Lambda, SQS, SNS, SES, API Gateway) - REST API design and third-party API integrations - C# backend systems, Entity Framework, SQL optimization - Desktop application development - Reverse engineering and hard debugging problems others have given up on I don't disappear mid-project. I ask the right questions upfront, keep communication clear throughout, and deliver on time - every time. My 100% Job Success Score across 18 years isn't an accident; it's how I work. If you have something genuinely difficult to build or fix, let's talk.

1. ASP.NET MVC, ASP.NET Core, .NET Core Web API, SignalR 2. Client-side web development: HTML, CSS, JavaScript, jQuery, Ajax, Bootstrap 3. Database: Microsoft SQL Server 2012, ADO.NET, Entity Framework, LINQ 4. Azure Services: Azure App Service, Azure SQL Database, Azure Functions 5. Generative AI & RAG: Retrieval-Augmented Generation (RAG), LangChain, AutoGen 6. Software Architecture: OOP, Repository Design Pattern, N-Tier Architecture 7. Push Notifications: Firebase Cloud Messaging (FCM)

I help businesses build, integrate, and modernize reliable software solutions using .NET, Web APIs, SQL Server, and ETL/SSIS pipelines. With 10+ years of hands-on experience, I specialize in backend and integration-heavy projects where performance, stability, and clean architecture matter. Whether you need to build a new API, integrate third-party systems, automate data flows, or troubleshoot a production issue, I focus on delivering solutions that actually work in real-world environments. What I do best Design and develop ASP .NET / ASP .NET Core applications Build and consume REST APIs (secure, scalable, well-documented) Create and optimize SSIS / ETL workflows for large and complex data loads Work with SQL Server (queries, performance tuning, stored procedures) Integrate systems like Microsoft Graph, SharePoint, Dynamics, Jira, GA4, and other APIs Diagnose and fix production issues, performance bottlenecks, and integration failures How I help clients Clear communication and practical recommendations Clean, maintainable, and well-structured code On-time delivery with attention to edge cases Honest feedback if something can be done better or simpler I’ve worked with startups, enterprises, and data teams, often on projects involving automation, reporting, data synchronization, and API-driven architectures. Many clients come to me after struggling with unreliable integrations or incomplete solutions — and my goal is to make things stable, understandable, and easy to maintain. If you’re looking for a dependable .NET expert who can understand your problem quickly and deliver a solid solution without unnecessary back-and-forth, I’d be happy to help. 📩 Feel free to reach out — I’m always open to discussing your requirements or jumping on a quick call if needed.

*** Committed to Safe & Secure your Idea, Source code and Data *** Experienced and Self-driven Professional and having extensive 20+ Years of experience as a full-stack developer & architect. Resourceful problem solver and skilled in team leading and product development. Driven by technical excellence, never ending improvement and the fun and reward of building things, achieving goals and helping/contributing as much as possible. Always happy and proactive to work on new challenge and contribute ideas to make process fast and deliver a reliable solution on-time. - Good listener and a very communicative team member. - Can work on my own without guidelines or supervision. - Experienced working remotely with foreign teams. - Like to keep things as simple as possible. - Like to learn/do/contribute as much as possible but always in orderly and controlled fashion so deadlines get meet. Skills: ✅ C#, .NET Framework / Core ✅ ASP.NET / MVC / ASP.Net Web/ Web API / WCF / OAuth ✅ Angular, Vue.js ✅ XAML / MVVM / SignalR ✅ AngularJs / KnockoutJs / JavaScript / TypeScript / jQuery ✅ HTML / CSS / Bootstrap AI TOOLS: ✅ OpenAI API, DeepFace, ML/DL frameworks (TensorFlow, Keras, PyTorch, Scikit-learn), LangChain, Mistral, AgenticAI, Transformers ✅ RAG + custom AI tools: Document recognition and processing, Market Grabber, project management bots, AI for telephony, video/audio analysis ORM Tools: ✅ Entity Framework / Dapper / LINQ / nHibernate and EntitySpaces Database: ✅ SQL (MSSQL, MySQL) / SQLite / MongoDB / Elastic Search / MS Access Cloud-Based Services: ✅ Windows Azure (Expert) / Amazon Cloud services (AWS) Payment Gateway ✅ PayPal/ Stripe / Authorize.Net / Sage APIs: ✅ Google Maps / Google Drive / Facebook / Twilio / Mailgun / Paypal / eBay / Stripe / Authorize.net Others: ✅ Jira / Trello / Git / TFS / BitBucket / GitLab / GitHub. Skill Keywords# Fullstack .NET Developer | Backend .NET Developer | ASP.NET Core | C# | MVC | Web API | SQL Server | Microservices | RESTful APIs | SignalR | Entity Framework Core | Blazor | Azure | AWS | Docker | Responsive Web Design | Frontend Development | Backend Development | Database Management | Agile Development | CI/CD Pipelines | Performance Optimization | Stripe Integration | Stripe Webhooks Integration | Apple In-app Purchase webhook Integration | Google Subscription Pubsub Webooks Integration

• Also known as Windows and macOS App Developer Expert • 5+ years of experience • I work on backend, frontend, databases, and Linux server administration • Main stack: .NET (C# / Visual Basic) and TypeScript / JavaScript • I build web and multi-platform desktop/mobile applications 📚 Technologies • My main tech stack is .NET (C# or Visual Basic .NET) and TypeScript / JavaScript • For .NET, I work with ASP .NET, Blazor, WPF, Windows Forms, MAUI (formerly Xamarin), Avalonia UI, and more • For TypeScript / JavaScript, I prefer React, but I can also work with Angular, jQuery, or vanilla JS • I can also develop macOS and iOS apps using Swift and Objective-C 🗼 Server Administration and DevOps • Familiar with Debian-based Linux distributions like Ubuntu • Able to handle VPS baremetal or Docker-based setups • Able to automate workflows using Bash, Python, GitHub Actions, and similar tools • Experienced with cloud services such as AWS and Azure 📊 Database • Microsoft SQL Server • MySQL / MariaDB • SQLite • PostgreSQL • Microsoft Access 💡 Skills • Strong in algorithm design and analysis • Great ability to solve programming and system trouble • Great at optimizing software performance • Flexible work style • Adaptive team player 📖 Self-Update • I regularly study new technologies to stay up to date. 🕰️ Flexible Availability • Open to collaborate across multiple time zones (US, CA, UK, EU, APAC, etc.) ✅ I’m not a robot. • I’m a real human and a solo freelancer, not an agency 🙌 Let’s Connect! • My name is Junian and I’d love to help bring your ideas to life • Feel free to reach out so we can discuss how I can support your project • Not a Vibe Coder, but use AI-Assisted Programming tools to solve problems • Linus Torvalds once said, “Talk is cheap. Show me the code.” So go ahead and check out my GitHub code. 🛠️ Common Tasks and Roles • Known as the Apple / macOS / iPhone guy • Build Windows app with .NET Framework & Windows Forms (WinForms) / Windows Presentation Foundation (WPF) / WinUI / Avalonia UI / MAUI / Xamarin • Build Windows Installer MSI / EXE from existing Windows App by using Wix / WixSharp • Build macOS app with Swift UI or .NET & Avalonia UI / MAUI / Xamarin • Build, sign, and notarize macOS app installer (PKG / DMG / ZIP) • Build web app with ASP .NET & Blazor / React / Angular / Vanilla JavaScript • Deploy and configure existing web apps by using Docker container to VPS / Cloud providers like AWS, Azure, or GCP • Ethical decompile / reverse engineer / source code retrieval / deobfuscation of existing .NET EXE / DLL / MSI or NinjaTrader Trading Indicator / strategy • Automate Windows UI tasks • Web scraping to retrieve online data / PDF / Images / any other files • Expert macOS system and app troubleshooting 🙋‍♂️ What I'm not • I'm not a Vibe Coder. Don't get me wrong, I use AI to build software, but I don't solely rely on it.

Professional in SQL Server, Access, MySQL, SQLLite, ASP.NET, VB.NET, VB6, JavaScript, DevExpress, Google APIs, Third party integration (like QuickBooks (QBSDK), DocuSign, Twilio), and Android development with more than 25 years of corporate experience in designing and developing commercial software solutions. I've been writing business software for more than 25 years, and I adore doing it. In order to come up with the best solution, I always think outside the box. I'm very independent, committed, and a self-learner who pays close attention to the little things. I don't quit until the job is successfully completed in accordance with your needs and expectations. I've worked on projects similar to this one before, so I can certainly assist you with this one as well. If you choose me for the job, I'll build it for you exactly as you envision it, and I'll do it quickly and cheaply.