Bryant University Duker began his coaching career at
Bryant University as a Graduate Assistant for two seasons.
University of Missouri Duker then moved on to the University of Missouri where he served as a graduate assistant and then defensive quality control on
Gary Pinkel's staff. The Tigers reached the SEC Championship game both of the seasons Duker was in Columbia.
Cleveland Browns Duker joined the
Cleveland Browns as a defensive intern in 2015 under
Head Coach Mike Pettine.
San Francisco 49ers Duker joined the
San Francisco 49ers as a defensive analyst in 2016 under
Head Coach Chip Kelly.
Baltimore Ravens Duker joined
John Harbaugh's staff with the
Baltimore Ravens as a defensive staff assistant in 2018 and then spent 2019-2020 as a defensive coaching analyst.
Detroit Lions Duker left Baltimore to join
Dan Campbell's
Detroit Lions staff in 2021. He initially served as a Defensive Assistant. After the 2021 season, he was promoted to Safeties Coach. During the 2022 season he was promoted to interim defensive backs coach when
Aubrey Pleasant was let go following the Lions Week 8 loss to the Miami Dolphins. Following the growth of the Lions defensive secondary, the team confirmed that Duker would continue as the defensive backs coach in 2023. The Lions young secondary players showed great growth under Duker's direction. Kerby Joseph blossomed into a feared player. As a rookie,
Brian Branch was also quick to experience success in the NFL.
Miami Dolphins Duker left the Lions to become the
Miami Dolphins Secondary Coach and Defensive Passing Game Coordinator in early 2024. Before the 2025 Season, NFL analysts believed the Dolphins would struggle because of lack of secondary talent. During the second half of the 2025 season, pundits felt that the Dolphins secondary was vastly outplaying that preseason assessment.
New York Jets On January 28, 2026, the
New York Jets hired Duker as their defensive coordinator under head coach
Aaron Glenn. ==Personal life==