[3] From 2012 to 2017, Johnson worked as a litigation associate at the Atlanta law firm of Parker, Hudson, Rainer & Dobbs, LLP.

From 2017 to 2025, she served as an assistant United States attorney in the U.S. Attorney's Office for the Northern District of Georgia; she served in the office's civil division until 2020, when she was transferred to its criminal division.

President Biden nominated Johnson to the seat being vacated by Judge Steve C. Jones, who subsequently assumed senior status on January 1, 2025.

[5] On September 25, 2024, a hearing on her nomination was held before the Senate Judiciary Committee.

[7] On December 5, 2024, the United States Senate invoked cloture on her nomination by a 50–45 vote.