A Microsoft Patterns & Practices developer designs, develops, and implements software solutions using Microsoft technologies. They follow best practices and proven patterns to ensure robust, efficient, and scalable applications. Their responsibilities include coding, debugging, testing, and refining software to meet client requirements. They also provide technical guidance on Microsoft technologies, helping teams to adopt and implement them effectively. Furthermore, they may work on enhancing system performance, ensuring security, and integrating various system components. This role requires a deep understanding of Microsoft technologies, programming languages, and software development life cycle. They also need to stay updated with the latest Microsoft updates and trends.