Proofpoint Software Engineer interview questions

Did a two hour coding project which was cool, for the initial job screening. It involved creating a app in C# and seemed to go pretty well. However the ghosted me after doing it, followed up on three separate occasions no response.

HR screen, then 1 hr technical interview (basic data structures and algorithms), then another 2 hr technical interview (SQL questions, database concept questions). Also a small assessment/task in java to complete.