What should I study / repeat so that I do good in interviews ? Can you give me any poitners ?
implies that there’s something you can study in order to do well in the interview for a senior Go developer. I think that Lutz’s point is that in addition to questions about technical ability that you might be able to practice for, they’re going to ask about end-to-end project and leadership experience that you can’t just study for. You have to have either already done it at a previous job, or be able to show how you, as a mid-level developer, went above and beyond.
Building a sample web application is a good start to demonstrate your technical ability. Copies of project plans, ERDs, process flows you came up with are good backing material and good reputable references should get you far.