[2] Undrafted after his junior year of college, Johnson signed a free agent contract with the Tampa Bay Rays on June 24, 2010, after being noticed by a scout at a local American Legion exhibition game.

[2] He spent the 2011 through 2013 seasons in the Arizona system, playing for the South Bend Silver Hawks and the Visalia Rawhide.

[9] On October 25, 2019, Johnson signed a one-year contract with the Hiroshima Toyo Carp of Nippon Professional Baseball.

In May 2021, Johnson was named to the roster of the United States national baseball team for the Americas Qualifying Event.

[15] On July 30, 2021, Johnson was traded to the Tampa Bay Rays along with Jordan Luplow in exchange for Peyton Battenfield.

[16] On August 16, Johnson was placed on the 60-day injured list with a sprained right shoulder, with manager Kevin Cash noting that he would miss "significant time.

[18] On January 11, 2024, after two years of inactivity, Johnson signed with the Leones de Yucatán of the Mexican League.

[20] On August 14, 2024, Johnson signed with the High Point Rockers of the Atlantic League of Professional Baseball.

[23] After the 2016 season, Johnson was not offered a contract by the Angels, and he worked at a lumber yard that offseason before being signed by the Rockies.