A Linq-Entities developer is a software professional who uses Language Integrated Query (LINQ) and Entity Framework in .NET applications for data manipulation. They create, modify, and optimize data access operations by converting SQL queries into LINQ expressions. They use Entity Framework to map databases to objects in code, which simplifies data handling. Their duties also include designing relational models, maintaining data integrity, and ensuring efficient data retrieval. They often work in collaborative teams, troubleshooting issues, optimizing performance, and developing high-quality, scalable solutions. Their role is crucial in managing data-driven processes in software development.