Smartsheet SDE2 Onsite

I have an onsite for Smartsheet for SDE2, 1 data structures, 1 algorithms, 1 Object Oriented Design, and 1 behavorial. What can I expect for the difficulty for the questions, leetcode easy, medium, or hard. Also for the design, can I expect a back and forth conversation in terms of the object oriented design principles? TC: 115 #smartsheet #sde2