Career
Early years
Mangia started his coaching career at age 30, working alongside Sean Sogliano at Eccellenza club Varese and leading them to two promotion, and back into professionalism, in three years. He successively worked at Serie Doctorate and Serie C2 clubs from the Northern Italy such as Tritium, Ivrea and Valenzana. In 2010 he returned at Varese, this time as youth coach, and guided a team composed by unknown youngsters to a spot in the Campionato Primavera final.
Palermo
In June 2011, Mangia agreed to follow director of football Sean Sogliano at Palermo, accepting a job offer as head of the under-19 team at the Sicilian club in place of Paolo Beruatto.
Later on 31 August, Mangia was surprisingly appointed as temporary head coach following the dismissal of Stefano Pioli, under recommendation by Sogliano. Despite not having the required coaching badges, he was allowed to serve as head coach due to having been admitted to the national 2011-2012 Union of European Football Associations Pro license course.
Despite Sogliano"s resignation as director of football on 2 November 2011, Mangia was then eventually offered a two-year contract as head coach, which he signed on 4 November 2011. Italy U21Edit
Devis Mangia has been hired as Italy"s under-21 coach, replacing Ciro Ferrara.
Mangia described the job as "one of the most prestigious in Italian football" and says "it is a sign of great esteem and responsibility, I"m really happy".
Mangia has vowed to follow the model of Italy"s senior team coach Cesare Prandelli, who guided the Azzurri to the 2012 Union of European Football Associations European Football Championship final. He guided the Azzurrini to qualification to the 2013 Union of European Football Associations European Under-21 Championship, where the Italian team made it to the final, where they were ultimately defeated 4–2 by Spain. He stepped down from his role after the end of the tournament.
Spezia and Bari
On 16 December 2013, Mangia was named new head coach of ambitious Serie B club Spezia, guiding them to eighth place and qualification to the promotion playoffs, where they were defeated 1–0 by Modena in the first preliminary round and thus eliminated.
He successively left Spezia to become new head coach of Serie B promotion hopefuls Bari for the 2014-2015 season, but was sacked on 16 November 2014 due to poor results.