A part-time product manager helps companies with product development, production planning, and marketing. You develop new products or improve existing products. As a part-time employee, you work less than 40 hours per week. Your duties depend on your employer and the type of products with which you work. Your responsibilities include formulating strategies and determining budgets for product development and marketing. You create a schedule or timeline for development, testing, and release. Some product managers negotiate with vendors to sell the product. You use industry knowledge and modeling to forecast sales and supply needs.