In 1997, Tirinzoni was the Swiss alternate for Bianca Röthlisberger at the World Junior Curling Championships. The team finished seventh. The following year, Tirinzoni was the Swiss skip, at the World Juniors, and she and her team of Michèle Knobel, Brigitte Schori and Martina von Arx finished sixth. In 1999, the same team returned to the Juniors, and won the whole tournament for Switzerland. After finishing the round robin in 2nd place with a 7-2 record, Tirinzoni led Switzerland to a semi-final win over Sweden's Matilda Mattsson and a final win against Japan (skipped by Akiko Katoh) to win the gold medal.
In 2005 Tirinzoni finished fourth at the Swiss Olympic trials. The following year she qualified for the 2006 Ford World Women's Curling Championship—her first. Her Swiss team finished in 10th place with a 3-8 record.
Tirinzoni returned to the 2007 World Women's Curling Championship with nearly the same team as in 2006, adding veteran Mirjam Ott to the lineup. Ott moved into the third position when the team began with three losses, and they nearly came back to qualify for the playoff round. Switzerland fell just short, finishing fifth with a 6-5 record. Later that year Ott returned the favour by making Tirinzoni her alternate at the 2007 European Curling Championships. Tirinzoni would not see any action however, and the team finished fourth.
In 2011, Tirinzoni won her first World Curling Tour event, the Red Deer Curling Classic. She would not play in an international championship until 2013, when she skipped Switzerland at the 2013 World Women's Curling Championship. After finishing the round robin with a 6-5 record, she found herself in a 3-way tie for fourth. After beating Russia's Anna Sidorova in the first tie breaker, she lost to the United States' Erika Brown in the second, settling for 5th place. Since then, Tirinzoni has won several World Curling Tour events, including the 2013 International Bernese Ladies Cup, the 2013 Stockholm Ladies Cup, the 2013 Women's Masters Basel and the 2014 Pomeroy Inn & Suites Prairie Showdown.
Tirinzoni and her rink began the 2014-15 season by winning their first World Curling Tour event, the 2014 Stu Sells Oakville Tankard. She then went off to skip the Swiss team (throwing third rocks) at the 2014 European Mixed Curling Championship. She would lead her rink of Martin Rios, Romano Meier and Jenny Perret to a bronze medal.
While Tirinzoni has not returned to an International Championship since 2014 (due to strong competition in her home country from teams like Alina Pätz and Binia Feltscher), she and her rink have been strong on the World Curling Tour since then. The 2015-16 season included three tournament wins, including the first slam of the year, the 2015 GSOC Tour Challenge, where she beat the World #1 Rachel Homan rink in the final. The team would also win the International Bernese Ladies Cup and the Glynhill Ladies International later that year, while she led her team to four other tournament finals.
Tirinzoni continued her WCT success the following season, winning their first event, the 2016 Stu Sells Oakville Tankard, but did not win any further tournaments. She begun the 2017-18 season by defending her Oakville Tankard title, which would be the third time she would win that tournament.
2007 Aomori World ChampionshipsEsther Neuenschwander, Third
Anna Neuenschwander, Second
Sandra Attinger, Lead
Mirjam Ott, Alternate
2006 Grand Prairie World ChampionshipsSandra Attinger, Third
Anna Neuenschwander, Second
Esther Neuenschwander, Lead
Carmen Schäfer, Alternate