He made his professional debut that year with the Dominican Summer League Mariners and spent the whole season there, going 3-3 with a 1.46 ERA in 13 games (ten starts).

On December 9, 2015, the Mariners traded Peralta, Daniel Missaki and Carlos Herrera to the Milwaukee Brewers for Adam Lind.

[8] Peralta began 2018 with the Colorado Springs Sky Sox and was called up to Milwaukee on May 13 to make his MLB debut.

Of all MLB pitchers, he held right-handed batters to the lowest batting average, .110 (in 30 or more innings).

[9] In 2019 for the Brewers, Peralta made 39 appearances for the club, registering a 7-3 record and 5.29 ERA with 115 strikeouts in 85.0 innings of work.