[1] He graduated into the KF2 category in 2009, now competing in the Bridgestone Cup Europe; he again finished in 31st place.

[1] In 2010, he entered multiple KF2-based series, driving for KSB Racing Team; the Karting World Championship, where he finished 19th,[2] the European KF2 Championship, where he finished 30th,[3] the WSK Euro Series, where he was classified 40th in the KF2 category, having not scored a point,[4] the Bridgestone Cup Europe, where he was classified fifth in the KF2 category;[5] and the German Kart Championship, where he was classified sixth, with 73 points.

[8][9] In the first round of the Formula Renault Eurocup season, held at Aragón, he finished 16th in the first race, and retired in the second.

[22] In 2012, Jäger entered the Formula Renault 2.0 Alps for the second time, driving for One Racing, with Alex Bosak being named as his teammate.

[24] In 2013, Jäger moved into the ATS Formel 3 Cup, driving for Performance Racing.