He spent his first professional season with the Low–A Tri-City ValleyCats and Single–A Quad Cities River Bandits, accumulating a 1.73 ERA across 19 appearances.

[2] In 2017, Hernandez made 38 appearances out of the bullpen split between the High–A Buies Creek Astros and Double–A Corpus Christi Hooks, registering a combined 3.38 ERA with 70 strikeouts and 10 saves across 58+2⁄3 innings pitched.

[3] Hernandez split the 2019 season between Corpus Christi and the High–A Fayetteville Woodpeckers, pitching to a combined 4.02 ERA with 37 strikeouts across 23 contests.

[5] In 2022, he spent the year with the Triple-A Sugar Land Space Cowboys, appearing in 48 games and posting a 5–5 record and 3.92 ERA with 77 strikeouts across 59+2⁄3 innings of work.

Following the season on November 6, Hernandez was removed from the 40–man roster and sent outright to the Triple–A El Paso Chihuahuas; he elected free agency the same day.