The main reason I attended the conference was to improve my qualifications as a finance executive.

executive 来自动词 execute（执行、实施），加上后缀 -ive 构成名词，指"执行者"或"管理人员"。在商业环境中特指公司高层管理人员，如"主管""执行官"等。finance executive 即"财务主管"，负责财务决策和管理工作。