Rader was signed by the Pittsburgh Steelers to a reserve/futures contract on January 9, 2019.[5] He was waived at the end of training camp, but was signed to the Steelers' practice squad on September 1, 2019.[6][7] He was released from the practice squad twice during the 2019 season, but was re-signed shortly afterwards both times. Rader signed a reserve/futures contract with the team on December 30, 2019.[8]
Rader was waived during final roster cuts again on September 5, 2020,[9] and re-signed to the team's practice squad the next day.[10] He was signed to the active roster on November 24, 2020.[11] He was waived on December 21,[12] and re-signed to the practice squad two days later.[13] He was elevated to the active roster on January 2 and January 9, 2021, for the team's week 17 and wild card playoff games, each against the Cleveland Browns, and reverted to the practice squad after each game.[14][15] He made his NFL debut in week 17. On January 14, 2021, Rader signed a reserve/futures contract with the Steelers.[16]
On August 31, 2021, Rader was waived by the Steelers as part of final roster cuts and re-signed to the practice squad the next day.[17][18] He was promoted to the active roster on November 23, 2021.[19]
On August 30, 2022, Rader was waived by the Steelers.[20]
Tennessee Titans
On September 1, 2022, Rader was signed to the Tennessee Titans practice squad.[21] He was promoted to the active roster on September 22.[22]
On August 29, 2023, Rader was waived by the Titans and re-signed to the practice squad.[23][24] He was promoted to the active roster on October 4.[25]
New Orleans Saints
On August 3, 2024, Rader signed with the New Orleans Saints.[26] He was placed on injured reserve on August 27, and released on September 2.[27]