For over a year, I took full responsibility for developing two Cambridge-based English course product lines, demonstrating my ability to manage both in-person and online course creation with precision. One product line aligned with the Cambridge FCE exam’s difficulty and competency model, while the other focused on cultivating 21st-century skills—particularly the 4Cs (Communication, Collaboration, Critical Thinking, and Cooperation)—at the PET exam level. I applied my strong attention to detail and expertise by thoroughly reviewing the textbook scripts provided by Cambridge University Press, ensuring that both the textbooks and workbooks were optimally designed. I then led the instructional design for each lesson, creating interactive courseware, knowledge checklists, workbooks, and other materials for nationwide use. Furthermore, I utilized my communication and teaching skills to record detailed video tutorials for students, demonstrating my ability to deliver high-quality educational content on a large scale.