Jax struggled during his first two years at the Air Force Academy,pitching to a 5.86 ERA as a freshman and a 5.17 ERA as a sophomore. In summer 2015,between his sophomore and junior years,he played summer league baseball for the Eau Claire Express of the Northwoods League.[4] He broke out with the Falcons as a junior in 2016,starting 15 games and going 9–2 with a school-record 2.05 ERA,striking out ninety and walking only ten in 105+1⁄3 innings.[5] He was named the Mountain West Conference Co-Pitcher of the Year alongside Jimmy Lambert.[6]
Jax began 2019 with the Pensacola Blue Wahoos of the Double-ASouthern League with whom he was named an All-Star.[19][20] While with Pensacola, he missed nearly three weeks due to fatigue.[21] In August, Jax was promoted to the Rochester Red Wings of the Triple-AInternational League, with whom he finished the season.[22] Over 23 starts between the two clubs, Jax pitched to a 5–7 record with a 2.90 ERA, striking out 94 over 127+1⁄3 innings.[23] Jax did not play a minor league game in 2020 due to the cancellation of the minor league season caused by the COVID-19 pandemic.[24] To begin the 2021 season, he was assigned to the St. Paul Saints of the Triple-A East.[25]
On June 5, 2021, Jax was selected to the 40-man roster and promoted to the major leagues for the first time.[26] Jax made his MLB debut three days later on June 8 in relief at home against the New York Yankees, becoming the first Air Force Academy graduate in MLB history (he is still a captain in the Air Force Reserve).[27] He pitched one inning, giving up three earned runs on two home runs while also registering his first strikeout versus Tyler Wade.[28] Jax finished the 2021 season with a 6.37 ERA over fourteen starts and four relief appearances.[29]
Jax became a full-time relief pitcher for the Twins in 2022. In 65 appearances out of the bullpen, he compiled a 7-4 record and 3.36 ERA with 78 strikeouts across 72+1⁄3 innings pitched.[30] Jax made 71 relief outings for the Twins during the 2023 season, registering a 6-10 record and 3.86 ERA with 68 strikeouts across 65+1⁄3 innings of work.[31]
Jax had a career year in 2024, when he set career-highs with 10 saves, 95 strikeouts, a 2.03 ERA, and a 0.87 WHIP across 72 appearances.[32] He pitched in 50 games for the Twins in 2025, logging a 1-5 record and 4.50 ERA with 72 strikeouts over 46 innings of work.[33]
Jax and his wife, Savannah, married in January 2021 in Gilbert, Arizona.[37] Savannah holds the rank of captain in the Air Force.[38] In March 2023, the couple had their first child, a daughter.[39]
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