He formerly served in several roles at the Merit Systems Protection Board, including member, acting chair, and general counsel.

[3] After graduating from BYU, Leavitt was hired as an intern in the office of Congressman Bill Sali, where he later was promoted to staff assistant.

[9] In March 2023, Leavitt was hired as president of Empower Oversight, which describes itself as a "non-profit anti-corruption organization" and, according to the New York Times, is a "small group mostly composed of Republican lawyers with deep experience in Capitol Hill investigations" who spent years as aides to Senator Charles E. Grassley, the Republican senator from Iowa.

[12] Clients represented by Empower Oversight include Federal Bureau of Investigation agents who raised concerns about the treatment of rioters who participated in the January 6 United States Capitol attack and Internal Revenue Service agents who alleged that President Biden's son, Hunter Biden, was receiving preferential treatment from federal prosecutors.

[15] In April 2023, Leavitt announced he intended to run for the West Virginia House of Delegates in the 53rd legislative district.