This project is a comprehensive multi-tenant ERP backend designed for high-volume vehicle service centers, built using ASP.NET Core Web API and SQL Server. I implemented a Clean Architecture approach with the Repository Pattern to strictly separate domain logic from infrastructure concerns, ensuring maintainability and testability. To address performance bottlenecks in job card processing, I optimized complex SQL queries using indexing and execution plan analysis, reducing average response times from 900ms to under 120ms. Security was enforced using JWT authentication with granular role-based access control (RBAC) to manage technician and admin permissions effectively.

A high-performance e-commerce backend API architected to handle concurrent user traffic and real-time inventory updates. Built with ASP.NET Core Web API and SQL Server, the system features dynamic product filtering and search capabilities optimized for speed. I implemented secure JWT authentication for user sessions and integrated Stripe for secure payment processing. The application uses caching strategies (Redis) to minimize database load for frequently accessed product data, ensuring sub-100ms API response times during peak traffic periods.