[3] De Armas graduated from Archbishop Curley High School of Miami, Florida, attended Miami Dade North Junior College and graduated from Georgia Southern University.

De Armas began his managing career in 1979, and as of 2018 he was still managing in the Philadelphia farm system with the GCL Phillies of the Rookie-level Gulf Coast League,[4] his 33rd season as a minor-league skipper.

In August 2019, de Armas was named a coach for the United States national baseball team for the 2019 WBSC Premier12 tournament.

[7] The team qualified, with de Armas serving as bullpen coach for the Olympics.

[9] De Armas won the 2021 Mike Coolbaugh Award for his "outstanding baseball work ethic, knowledge of the game, and skill in mentoring young players on the field.