In e-commerce platforms like JD.com, marketing directors usually hold positions such as e-commerce marketing manager or e-commerce operations manager. The main responsibilities of these positions are to formulate and implement marketing strategies and promote the sales and operations management of e-commerce businesses. Specifically, marketing directors need to formulate marketing plans, including promotional activities, advertising, content marketing, etc., to attract potential customers and increase sales. In addition, they also need to collaborate with product teams, operations teams, etc. to ensure the smooth launch and sales of products.

In addition to formulating marketing strategies, marketing directors are also responsible for team management and training to ensure that team members have professional knowledge and skills to support the company's business development. In addition, they also need to pay close attention to market dynamics and competitors' movements, and adjust strategies in a timely manner to adapt to market changes.

In short, the position held by a marketing director in the JD.com e-commerce platform requires rich marketing experience and excellent leadership skills to promote the company's e-commerce business development and achieve sales goals.