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After retiring from professional football, Pierce transitioned into coaching. He began at Long Beach Poly High School and worked his way up through various positions at Arizona State. From 2014 to 2019, he served as a linebackers coach and recruiting coordinator. His coaching ascension continued, and by 2021, he had attained the role of full-time defensive coordinator and associate head coach.
Pierce's tenure in college football saw him leading defenses that consistently ranked in the top tier for points allowed. His coaching acumen earned him a position with the Raiders, first as a linebackers coach, and ultimately as head coach after the firing of Josh McDaniels.