Hello, brother, I'm from Huawei, and I happen to be doing pre-sales solutions. Your position is similar to mine, that is, designing network solutions, bidding, quotation and other contents according to customer needs. Of course, you will also communicate with customers, preach solutions, coordinate the resources of other departments, and complete the pre-expansion and bidding of the project. Pay attention to your technical knowledge and English. Before selling, you should communicate with your customers, so you should speak PPT in English. The highest level of pre-sales is consulting, such as Accenture. In fact, pre-sale is very promising. Understand not only the technical scheme, but also the business, and be good at English. So we should seize the opportunity. I hope my answer is helpful to you!