[2] Motivated by a desire to train full-time alongside her secondary school studies, Pajarinen moved 380 km (240 mi) from home to enroll at Kuortaneen urheilulukio and join Team Kuortane.

Pajarinen played a pivotal role in securing the first SM medal in team history, posting the best save percentage (.949) and goals against average (1.50) of all playoff goaltenders.

[5] During her three seasons with Team Kuortane under head coach Jari Risku, Pajarinen's teammates included national team players Sini Karjalainen, Anni Keisala, Petra Nieminen, Jenniina Nylund, Eve Savander, Sara Säkkinen, Viivi Vainikka, Emilia Vesa, and Kiira Yrjänen, among many other young stars of Finnish ice hockey.

[8][9] Sport struggled with the level of play in the Naisten Liiga and the demands placed on Pajarinen were increased in comparison to her seasons with Team Kuortane as a result.

As a junior player with the Finnish national under-18 team, Pajarinen participated in the 2016 IIHF World Women's U18 Championship in St. Catharines, Canada.

[17] Pajarinen was named to the Finnish roster for the 2024 IIHF Women's World Championship as the team’s third goalie behind starters Anni Keisala and Sanni Ahola.