General programming questions, basic rules. Web development life cycle. Database connection. Do you know about stateless protocols ? Why we use "using" keyword ? Why we use "String Builder" ? What kind of a type string ?

The HR reached me out from LinkedIn. I accepted the first meeting with her. We talked about the process, role, company, plans for almost 1 hour. After 1 week later, she sent a case study through mail. There were 1 week to complete it. It was a in-memory key-value storage application must be written in Go. It was completed in almost 3-4 days. Then, they invited to me online interview with the senior engineers. It was a 1 hour interview and, firstly, we talked about the project. They asked some questions and clarified the some points. Then, they asked to algorithm and data structure questions. I did not write any code, we discussed verbally. Then, they made offer to me almost after 1 week.