He subsequently served as the city's Chief of Health and Human Services from 2014 until his dismissal in 2017 following an investigation into sexual harassment allegations.

When he was twenty, Arroyo started working as the director of constituent services for Boston City Councilor Chuck Turner.

[11] Walsh cited Arroyo's ability to bring people together and work collaboratively, as well as his understanding of the importance of addressing the needs of Boston's most vulnerable population.

[15] In August 2020, Arroyo filed suit against the City of Boston and Mayor Walsh alleging breach of contract, negligence, and defamation.

[17] Arroyo is a lifelong Bostonian, born in the South End, raised in Hyde Park, and a graduate of the Boston Public Schools.

[18] As of November 2020[update], Arroyo's LinkedIn profile listed his occupation as Chief Operating Officer at El Mundo Boston, a Latino media outlet.