Bargan Constantin

• • Designed and implemented configurable system modules that adapt to complex business rules, improving client flexibility and project scalability.

• • Automated critical business workflows, enhancing operational efficiency and reducing manual dependencies.

• • Integrated an AI-powered support assistant into an enterprise application, using LLM based workflows to help users resolve account, purchase, and service-related issues based on application context and backend data.

• • Implemented backend-side LLM integration flows, including prompt construction, API request/response handling, application context injection, action routing to internal backend services for operations such as activation/reactivation, and fallback support ticket creation when automated resolution was not possible.

• • Built RESTful APIs using ASP.NET Core and Entity Framework Core to ensure secure and efficient communication between services.

• • Collaborated with cross-functional teams to integrate ASP.NET Core backends with frontend applications built using React, focusing on API design, data contracts, and frontend-backend communication.

• • Proposed and implemented architectural improvements to support system scalability and long-term maintainability.

• • Applied Clean Architecture, SOLID principles, and Agile methodologies to ensure long-term maintainability and reliability.

• • Worked with React-based frontend projects to understand component structure, state management basics, and data flow from REST APIs.

• • Contributed to documentation, architectural discussions, and continuous system improvement initiatives.

• • Proactively identified and escalated technical blockers, ensuring smooth and timely feature delivery.

Ensured that shared components exposed clear and stable contracts, allowing new functionality to be added without impacting existing projects. Paid close attention to interface design, versioning, and extensibility to guarantee safe adoption across different solutions.

Worked on backend development using C# and .NET Core, focusing on building and maintaining RESTful APIs with a strong architectural foundation. Collaborated within a development team on internal projects implementing CQRS and MediatR to achieve clean separation of concerns and improved scalability.

Implemented secure authentication and authorization using ASP.NET Identity and JWT, and managed PostgreSQL and MSSQL databases for optimized performance and reliability.

Developed and executed unit and integration tests using xUnit, Moq, and Bogus to ensure code quality and maintainability. Integrated SignalR for real-time communication and applied caching strategies to enhance application performance.