Google Data Engineer interview tip

I have a data engineer interview coming up with Google. Can someone please give me some guidance on how hard they go with DSA? Also how much of system design will they ask? I am comfortable with SQL and decent with python and spark. What else do I need to focus on? Especially on DSA side. Exp: 4 years #google #dataengineer #dataengineerinterview #interview #technology #amazon #interview #it