A BizTalk & developer designs, develops, and manages business processes using Microsoft BizTalk Server. They create schemas and maps, orchestrate workflows, and implement business rules. They handle integration with different systems using adapters, and ensure reliable message delivery using pipelines. They are also responsible for debugging, exception handling, and transaction management. They manage deployment and configuration, perform performance tuning, and ensure system availability and scalability. Additionally, they may also work with other team members to design and implement end-to-end solutions that align with business requirements.