Neeraj S.

I help SaaS companies, fintech businesses, healthcare technology providers, and enterprises modernize legacy .NET applications, migrate to Azure or AWS, and build secure, scalable backend systems using C# and ASP.NET Core. With 9+ years of experience, I specialize in modernizing 10–15+ year-old .NET applications, developing high-performance REST APIs, designing microservices, and building multi-tenant SaaS platforms. My experience includes complex financial integrations, cloud migrations, and business-critical systems where performance, security, and reliability matter. My primary focus is .NET Legacy Modernization, supported by Azure/AWS Cloud Development, SaaS Architecture, Microservices, and API Integration. I have delivered backend solutions across fintech, healthcare, logistics, manufacturing, e-learning, marketplaces, and e-commerce. WHAT I CAN HELP YOU WITH -Legacy .NET Modernization & Cloud Migration -Upgrade .NET Framework, ASP.NET MVC, and WCF applications to modern .NET and ASP.NET Core -Refactor monolithic systems into modular architectures or microservices -Migrate applications and databases to Microsoft Azure or AWS -Improve application performance, security, database queries, and maintainability -Preserve critical business workflows during modernization SaaS, Backend & API Development -Build scalable multi-tenant SaaS platforms using C# and ASP.NET Core -Develop secure REST APIs with JWT, OAuth2, OpenAPI, and versioning -Design Clean Architecture, CQRS, event-driven systems, and microservices -Implement SignalR, webhooks, background workers, and scheduled jobs -Optimize APIs, SQL queries, and backend performance Azure, AWS & DevOps -Azure App Service, Azure Functions, Azure SQL, Storage, Key Vault, and App Configuration -AWS EC2, RDS, Lambda, Docker, and CI/CD pipelines -Azure DevOps and GitHub Actions for automated deployments -OpenTelemetry, Application Insights, and Log Analytics for production monitoring -Secure configuration, automated testing, and cloud reliability Fintech & Third-Party Integrations -Consumer lending, credit decisioning, and multi-lender waterfall workflows -Loan application intake, offers, refunds, cancellations, funding, and settlements -Payment gateway, lender, and third-party API integrations -Resilient HTTP clients with retries, rate limiting, and error handling -PII redaction, data classification, and security-sensitive development RELEVANT INDUSTRY & PROJECT EXPERIENCE -Legacy Modernization: Modernizing 10–15+ year-old .NET applications, restructuring architectures, optimizing SQL databases, and migrating business-critical systems to the cloud. -Fintech & Lending: Developing consumer lending workflows, credit-decisioning systems, multi-lender integrations, funding processes, and secure financial APIs. -SaaS & Marketplaces: Building multi-tenant backend platforms, authentication systems, REST APIs, and scalable cloud applications. -Healthcare IT: Developing backend applications, data-intensive workflows, cloud services, and third-party system integrations. -Logistics & Supply Chain: Building backend systems for operational workflows, API integrations, and business process automation. -Manufacturing & E-commerce: Developing business applications, modernizing existing systems, and integrating third-party services. TECHNICAL EXPERTISE -Backend: C#, .NET Framework, .NET Core, .NET 6/7/8/10, ASP.NET Core, ASP.NET MVC, Web API, WCF, Razor Pages -Architecture: Microservices, Modular Monolith, Clean Architecture, CQRS, MediatR, SOLID, Dependency Injection, Multi-tenancy -Cloud & DevOps: Microsoft Azure, AWS, Azure DevOps, GitHub Actions, Docker, CI/CD, Azure Functions, AWS Lambda -Databases: SQL Server, Azure SQL, PostgreSQL, MySQL, MongoDB, Redis, Entity Framework Core, Dapper, LINQ -Frontend: React.js, Angular, TypeScript, JavaScript -API & Security: REST APIs, OpenAPI, JWT, OAuth2, API Versioning, SignalR, Webhooks, Azure Key Vault -Testing & Monitoring: xUnit, Moq, SonarCloud, SonarLint, OpenTelemetry, Application Insights, Log Analytics AI TOOLS & AI-ASSISTED DEVELOPMENT -Claude Code, GitHub Copilot, and OpenAI Codex CLI for development, refactoring, testing, and legacy migration planning -Model Context Protocol (MCP) integrations with Azure DevOps, Aikido, and SonarQube/SonarCloud -AI-assisted code review, test generation, debugging, and security analysis -Human-reviewed code, automated quality gates, and secure AI development practices HOW I WORK -Understand business goals, existing architecture, and technical challenges -Identify legacy dependencies, performance bottlenecks, and migration risks -Deliver clean, maintainable, tested code with regular communication -Prioritize scalability, security, reliability, and long-term stability I work as part of Ditstek's software development team, combining hands-on .NET engineering with collaborative delivery.