[4] Smith-Williams was selected by the Washington Football Team in the seventh round (229th overall) of the 2020 NFL draft.

[7] In the Week 10 of the 2021 season, Smith-Williams had his first career start in place of an injured Montez Sweat.

The following week, he and defensive tackle Daron Payne sealed the win over the Carolina Panthers after they sacked quarterback Cam Newton on fourth down with less than a minute and a half left in the game.

[9][10] With defensive end Chase Young missing the majority of the 2022 season while he recovered from his ACL tear, Smith-Williams started 14 games in his place and finished with 23 total tackles, one pass defection, and three sacks.

[13] He served as an intern for IBM during college, specializing in robotic animation, and has a job offer with them following his football career.