Rahul K.

I help SaaS companies build robust, secure and multi tenant applications using C#, .NET Core, PostgreSQL/SQL Server and Azure with dynamic Angular frontend or a unified Blazor UI that grows seamlessly with their user base. Hi, I am a Senior .NET Developer and Cloud Architect specializing in the design, development and deployment of enterprise-grade SaaS platforms. With a strong background in C#, .NET Core, Angular, Blazor and Microsoft Azure, I bridge the gap between high-level business logic and complex cloud infrastructure. I have built this architecture across complex ERP platforms, healthcare portals, logistics systems and internal business tools. If you're building a SaaS product that needs to serve multiple clients on a single codebase with multi-tenant architecture, subscription modules, role-based access, that is exactly what I do. What I can build for you: ✔ Multi-Tenant Architectures: Secure SaaS application development in .NET Core with strict schema-based or filter-based data isolation. ✔ Billing & Subscriptions: Seamless Stripe and PayPal integration for recurring billing, usage-based pricing and secure webhooks. ✔ High-Performance Blazor Frontends: Fast Blazor Server and Blazor WebAssembly frontends for end-to-end C# development without context switching. ✔ Modern SPAs: Smooth Angular single-page applications connected to secure .NET 8 / 9 backends. ✔ Clean & RESTful APIs: Enterprise-grade API design utilizing CQRS (MediatR), Domain-Driven Design, Clean Architecture and SOLID principles. ✔ Identity & Cloud Security: Scalable Azure cloud hosting paired with secure identity management such as Azure AD B2C, JWT, and OAuth2. ✔ Legacy Refactoring: Migrating older .NET Framework codebases to modern .NET Core / .NET 8+ with full architecture to improve speed, security and scalability. Tech Stack & Architecture Expertise: Backend Technologies: C#, .NET Core / .NET 8 / .NET 9 ASP.NET Core, ABP. IO ASP.NET Core Web API, Minimal APIs REST APIs, Third Party APIs integrations Entity Framework Core, Dapper, SignalR Frontend Technologies: Blazor Server, Blazor WebAssembly Blazor Web App template Razor Pages, Angular, Javascript Cloud & DevOps: Microsoft Azure, Azure App Services, Azure Functions, Service Bus, Azure Blob Azure DevOps, CI/CD pipelines, Microservices GitHub Actions, Docker, Containerization Databases: SQL Server, Azure SQL, MySQL Cosmos DB, PostgreSQL Query optimization, Database Architecture Identity & Security: OAuth2, OpenID Connect JWT, Azure AD B2C Duende IdentityServer Architecture Patterns: Clean Architecture, Domain-Driven Design CQRS, Repository Pattern N-Layered & Onion Architecture AI Technologies: OpenAI, Claude Code ClaudeAI, Claude APIs, Copilot Generative AI, AI Integration LLM, AI Models How I work: Before writing a single line of code, I review your architecture or gather business requirements to spot potential scaling bottlenecks early. I write thoroughly documented and testable code that your team can easily maintain. I work as a strategic technical partner for startups and large enterprises to ensure their applications are structurally secure and ready to scale. Let's connect or share your project requirements and I’d love to help you build your project. Keywords: .NET, .NET 8, .NETCore, .NET Framework, C# .NET MVC Framework, ASP.NET, ASP.NET Core ASP.NET MVC, RESTAPI, Web API, Third Party APIs Blazor, Blazor WebAssembly, Blazor Server Razor Pages, MVC Razor Pages Angular, Javascript Azure, Azure Blob, Azure DevOps Docker, Containerization, CI/CD pipelines Entity Framework Core, Microsoft Azure Clean Architecture, Domain Driven Design Microservices, Rule Based System Database Design, MySQL, PostgreSQL SaaS Application, Multi Tenant Application Multi Tenant SaaS Application SaaS Platform Development Full Stack Developer, .NET Developer C# Developer, .NET Developement .NET SaaS Application, Senior .NET Developer Senior Full Stack Developer, Web Application AI SaaS Developer, AI Integration, OpenAI Claude Code, Claude AI Integration AI Powered Application Developer AI Integrated Platform, AI native development AI Native .NET Application, .NET AI SaaS Application ERP Platform, Enterprise Application Enterprise Application Developer Backend Developer, .NET Backend Developer .NET Application Developer, .NET Migration Legacy .NET Application Migration .NET Application Migration