A Microsoft T-SQL Development developer designs, implements, and manages database solutions using Transact-SQL, Microsoft's extension of SQL. They write T-SQL scripts for CRUD operations, create complex stored procedures, triggers, and views to support applications. They optimize database performance through indexing and query optimization. They also design and implement data models, ensure data integrity, handle database security, and troubleshoot any issues. Additionally, they may work with other developers to integrate databases with applications, and assist in data analysis and migration tasks. Their role is critical in maintaining efficient, reliable, and secure data storage and retrieval systems.