I applied through college or university. The process took 4 weeks. I interviewed at Sourcefire (Columbia, MD) in May 2015
Interview
I took take-home test first which is basically c programming problems and network related conceptions. Then I went to Columbia for onsite. There were 4 rounds. They recommended to use C in interview but not required. The problems were not hard but they might comp up with some follow-ups regarding OS or network.
Interview questions [1]
Question 1
Reverse a string, find IP address, reverse linked list etc
I applied in-person. The process took 5 days. I interviewed at Sourcefire (Columbia, MD) in Jan 2012
Interview
6 engineers from different teams UI/Database/snort/networking/support/maintenance asked to write code, asked language and data structure questions. Asked general networking questions, knowledge of protocols. Schedule preference, desired level of involvement in customer issues.
