William de Mattia (born 28 April 1983), sometimes known as Dema, is a Brazilian football coach and former player who played as a midfielder.
Honours Coach Nova Mutum Campeonato Mato-Grossense Second Division: 2019 Campeonato Mato-Grossense: 2020
Treze Campeonato Paraibano: 2023
Sergipe Campeonato Sergipano: 2026
References http://www.veikkausliiga.com/ennatykset_index.htm