He played college football for the BYU Cougars and signed with the Los Angeles Chargers as an undrafted free agent in 2017.

[3] Davis lost his starting position for a time during his senior season, but came off the bench to make the biggest play of his career, an interception and 40-yard return on the road against Michigan State that helped the Cougars secure a 31–14 upset victory.

[10] Davis was suspended two games by the NFL for violating the league's substance abuse policy on November 22, 2019.

[12] In Week 4 against the Tampa Bay Buccaneers, Davis intercepted a pass thrown by Tom Brady and returned it 78 yards for a touchdown during the 38–31 loss.

[13] On March 15, 2021, Davis signed a 3-year contract extension with the Chargers worth 25.2 million dollars.