Alexandra Hasler, who starts for SC Birg Bern, took part in the European Cup for the first time in January 2013 in the Puy-Saint-Vincent and finished 31st and 21st. At the European Youth Olympic Winter Festival 2013 in Predeal , she finished 23rd place in Parallel giant slalom and tenth place in snowboard cross. In the 2013/14 season she achieved five top ten placements, including third place in Lenk , fifth place in the snowboard cross ranking in the European Cup. At the Junior World Championships 2014 in Chiesa in Valmalenco she came in 17th place. The following season she won two second and one third place in the European Cup. In addition, she won Isola 2000 and Lenk, winning the snowboard cross ranking in the European Cup. At the Junior World Championships 2015 in Yabuli she came in 25th place. At the beginning of the 2015/16 season, she started the Snowboard World Cup in Montafon for the first time and finished 19th. In the further course of the season she came under the top ten twice and reached 13th place in the Snowboard Cross World Cup. At the Junior World Championships in 2016 in Rogla , she finished 13th and at the Junior World Championships in 2017 in Klínovec, 15th. In March 2017 she became Swiss champion in snowboard cross in Lenk.
Hasler has taken part in 13 World Cups so far and was twice in the top ten (as of January 28, 2018).