correctional instructor; juvenile detention instructor
Official title for instructors working in correctional facilities, especially juvenile detention centers (少年院) and juvenile classification homes (少年鑑別所).
He works as a correctional instructor at a juvenile detention center.
刑務官 is a prison officer working in adult prisons, while 法務教官 is specifically an instructor for juvenile correctional facilities.
Compound of 法務 (legal affairs) and 教官 (instructor). The term reflects the role's affiliation with the Ministry of Justice (法務省).