FireEye Software Engineer Intern interview questions

After I applied online for a technical position, I received many mails for online assessments for various positions. After the screening, I received a call for phone interview, which was a 2 part interview. One with the hiring manager and another with a technical person. The interview was smooth, the interviewers were very friendly and after about 2 weeks I received a call telling I was selected. But there was an initial glitch about receiving the offer letter through mail, but the HR was in constant touch with me and readily available to answer all my queries.