LinkedIn ML Engineer

I have an Onsite interview at LinkedIn for the Senior Software Engineer- Machine Learning role. What would the interview rounds be comprised of? I am a data scientist with 4 YOE and a PhD in Math. I am very good with machine learning- theory and applications. I build ML systems in Python But I have never been a software engineer. I have 3 weeks. How should I prepare? YOE: 4 after PhD TC: 180