The duties of a senior associate at PWC can vary depending on the specific department or practice area they are working in. However, generally speaking, a senior associate at PwC would be responsible for working on client projects and providing a range of professional services, such as audit, assurance, tax, consulting, or advisory services. They would be expected to have a high level of technical expertise and experience in their field and would be responsible for leading teams of junior associates on projects. Senior associates also play a key role in developing client relationships and business development. They are also responsible for mentoring and developing junior staff.