Pre-sales work is more common in the computer industry. Because the industry needs to make plans according to customers' early needs and communicate with customers in the early stage, this position needs to explain the technology clearly in customized language as much as possible, and needs to respond flexibly to various problems raised by customers on the spot, so it needs people who know customers' business knowledge and are very familiar with the company's products and technologies to deal with them. Therefore, the establishment of pre-sales posts is a bridge between the market and R&D, which requires high quality in all aspects and requires certain writing skills, communication skills and professional knowledge. Wages in companies are generally higher.