Zillow Interview for Principle SDE, Big Data

I have a phone interview scheduled with Zillow for principle sde, big data. The job description looks like a data engineer profile but it seems zillow groups DE under SDE family. The interview is scheduled with a Senior SDE. Any idea what should I expect in the Interview? will it be focussed on Software Engineering or more towards big data. I am a data engineer at Amazon working on building custom datapipelines over EMR/Spark.