Hernández made his Major League Soccer (MLS) regular season debut in the 2014 season opener with a start at center back. His performances in MLS allowed him to gain the attention of the Guatemalan National Team, which began calling him up beginning in 2015 including for the 2015 CONCACAF Gold Cup.[5] Hernández was sent on a season long loan to North American Soccer League side Rayo OKC on April 29, 2016.[6]
On January 24, 2017, FC Dallas announced the club and Hernández had agreed to part ways, due to the uncertain nature of his future with the club.[7] He returned to Comunicaciones permanently.
On July 31, 2018, Hernandez signed a contract to return to FC Dallas.[8] On September 6, 2018, he was loaned to San Antonio FC.[9]
Hernandez was released by Dallas at the end of their 2019 season.[10] On 31 December 2019, Hernández returned to Guatemala and joined Antigua GFC.[11]