Between 2007 and 2015, Darin served as a Federal Bureau of Information intelligence analyst for the Omaha Division. He regularly wrote intelligence reports used for decision makers, including at least one for a POTUS briefing. He was recognized with several FBI Omaha-specific awards, several Iowa-specific awards, and an award for collaboration given by the DNI in 2015.

While at the FBI, he completed over a hundred training courses on a variety of national security, intelligence, and law enforcement topics. He was certified as Chief Reports Officer (awarded by FBI in 2015) and completed the Intelligence Community Advanced Analyst Program (awarded by the DNI in 2015).

In 2017, Darin worked on a Department of Homeland Security contract on the topic of countering violent extremism for the greater Kansas City area.