A .NET developer designs, builds, and maintains software applications using the .NET framework and associated technologies like C#, ASP.NET, and SQL Server. They are responsible for translating business requirements into functional code, ensuring code quality, and troubleshooting issues. 

Key Responsibilities:

• Design and Develop Applications: Develop new applications or enhance existing ones based on user needs and business requirements.
• Coding and Testing: Write, debug, and test code using C#, VB.NET, and other .NET languages.
• Database Management: Work with database systems like SQL Server to store and retrieve data.
• Troubleshooting and Maintenance: Identify and resolve software defects, optimize performance, and maintain existing applications.
• Collaboration: Work with other developers, designers, and stakeholders to ensure successful project outcomes.
• Documentation: Create and maintain clear and concise documentation for applications.
• Technical Support: Provide technical support to end-users or other developers. 

Skills and Experience:

• Programming Languages: Proficient in C#, VB.NET, and potentially F#. 
• .NET Framework: Strong understanding of the .NET framework and its various components. 
• Database Management: Experience with SQL Server or other database systems. 
• Web Development: Knowledge of ASP.NET MVC, Web API, or other web development technologies. 
• Testing and Debugging: Ability to write unit tests and debug complex issues. 
• Version Control: Familiarity with version control systems like Git. 
• Problem-solving: Ability to analyze problems and develop effective solutions. 
• Communication: Strong communication skills to collaborate with others. 

Additional Notes:

• The specific responsibilities and required skills can vary depending on the company and the specific project. 
• Some roles may require experience with specific .NET technologies like .NET Core or .NET 5. 
• Experience with cloud platforms like Azure or AWS may also be beneficial. 
• A bachelor's degree in Computer Science or a related field is often required, but experience can be a substitute.