An ASP.NET Core developer designs, builds, and maintains web applications using ASP.NET Core framework. They write clean, scalable code using .NET programming languages, upgrade, configure and debug existing systems, and provide technical support for web, desktop, or mobile applications. They work with SQL Server databases, APIs, and MVC architecture, while adhering to Agile methodologies. They also collaborate with internal teams to produce software design and architecture, test and deploy applications and systems, and revise, update, refactor and debug code. They improve existing software, develop documentation throughout the software development life cycle (SDLC), and serve as an expert on applications.