Salesforce Software Engineer(Internship) interview questions

I had three interviews, two technical and one non-technical(i.e HR). The interviewers were really good and friendly. I was asked questions from Data structures and algorithms , Database Management Systems , and Operating Systems.

The coding round consists of three questions and fairly consists of difficulty ranging from easy then two mediums. The other questions were, the second was based on the implementation of LIS, and the third one was on graphs.