Career
Born in Wijk bij Duurstede, [1] Kosterman began karting at the age of nine. [2] In her karting career, Kosterman finished runner-up in the 2017 Dutch Karting Championship, [3] represented the Netherlands in the 2018 Karting Academy Trophy, [4] and was part of the inaugural FIA Girls on Track – Rising Stars shootout in 2020. [5]
Stepping up to cars in 2021, Kosterman joined NXT Racing to compete in the Ford Fiesta Sprint Cup as a KNAF Talent Junior, [6] finishing 17th in points at season's end and was retained as a KNAF Talent Junior for the following year. [7] [8] Kosterman remained in the Ford Fiesta Sprint Cup for 2022, switching to V-Max for her sophomore season. [9] During 2022, Kosterman also raced in the Radical class of the Prototype Challenge and was retained as a KNAF Talent Junior at the end of the year. [10] [11]
In 2023, Kosterman joined Bas Koeten Racing to return the Ford Fiesta Sprint Cup Netherlands, [12] taking a lone win at Assen on her way to runner-up in junior standings and third in overall points. [13] The following year, Kosterman competed in the Lamera Cup and was the highest-placed female at season's end. [14] [15] At the end of the year, Kosterman made a one-off appearance in the F4 Indian Championship, taking a best result of ninth in race one. [16]
Remaining in single-seaters for 2025, Kosterman joined JHR Developments on a part-time basis to race in the F4 British Championship. [17] Finishing 11th on debut at Silverstone, [18] before taking a best result of 13th at Snetterton and taking her maiden points by overtaking four cars in race two. [note 1] [20] Returning to the team for the British Grand Prix-supporting non-championship round at Silverstone, Kosterman finished 20th and 17th in both races. [21] Kosterman remained with the team for her home round at Zandvoort, in which she took a best result of 17th in round one in what turned out to be her final appearance of the season. [22] During 2025, Kosterman made a wildcard appearance in F1 Academy at the Zandvoort round, racing for Hitech TGR with support from TeamViewer. [23] Qualifying ninth on debut, Kosterman finished 12th in race one after starting from the pits, [24] before taking her maiden points by finishing seventh in race two. [25]
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