[4] On 3 December 1802, he was appointed as an advisor to the government of the Intendancy of San Salvador after the resignation of Manuel Clavijo,[1][5] but it took until 17 April 1804 for him to assume office[3] due to suspicions about his French ancestry.

[1] In 1813, Barriere was appointed as an advisor to the government of the Intendancy of Comayagua [es]; he assumed office on 31 July 1813.

[3] In 1818, he returned to San Salvador and was given the additional duties of being the legal advisor to Colonial Intendant José María Peinado [es].

[9] Various liberal political leaders called upon Barriere to hold elections to send representatives to the Consultive Junta—the Central American government—and in response, he called for the formation of a "junior economic and consultive junta" ("junta subalterna económica y consultiva").

He died commanding forces loyal to Arce — who had since become president of the Federal Republic of Central America and whom Barriere had since become an ally of — against those of Francisco Morazán.