A Microsoft SQL Server developer designs, implements, and maintains databases using Microsoft's SQL Server platform. They create and manage database tables, indexes, and views, and write complex SQL queries to manipulate data. They also develop stored procedures, functions, and triggers to automate tasks. Developers ensure data integrity, optimize performance, and secure data by implementing appropriate permissions and roles. They work closely with other IT team members to integrate databases with applications, and often assist in data migration, troubleshooting, and problem resolution. Additionally, they may participate in data modeling and design reviews.