The Senior Account Executive role involves supporting all aspects of managing the client's business and ensuring smooth day-to-day operations. Key responsibilities include collaborating with colleagues and local markets to meet client service needs, utilizing and evaluating Cascading Style Sheets and research tools for insights and ideation, coordinating activities to ensure projects are delivered on time and within budget, supporting client managers with general client liaison and administration, connecting with client representatives to support communication and service delivery, and researching new market trends for planning. The role requires monitoring sales data to assess plan effectiveness and address any issues.