A Microsoft SQL Server Developer designs, implements, and manages databases using Microsoft's SQL Server platform. They create and maintain databases, write complex SQL queries, procedures, and triggers for database operations. They are also responsible for the performance tuning of databases, ensuring data integrity, security, and optimizing the use of server resources. They collaborate with software developers to integrate databases with applications, troubleshoot issues, and implement backup and recovery strategies. Additionally, they may be involved in data migration and transformation tasks, and often need to keep up with the latest trends in database technologies.