In November 2022, Claar van der Kalff moderated a high-profile national election debate broadcast by NOS. Her role as moderator was praised for her ability to facilitate a balanced and insightful discussion among the participating political leaders.

Claar van der Kalff led an investigative series for NOS on the impact of climate change in the Netherlands. The series highlighted the challenges faced by local communities and the urgent need for policy changes, sparking national debate and awareness.

In 2019, Claar van der Kalff published a book analyzing the Dutch political landscape, drawing on her extensive experience and insights as a journalist. The book was well-received, offering readers a comprehensive look at the complexities of Dutch politics.

Claar van der Kalff joined NOS as a senior reporter, where she continued to focus on investigative journalism and high-impact news stories. Her role at NOS allowed her to reach a broader audience and contribute to the national conversation on pressing issues.

Claar van der Kalff received the prestigious De Tegel award for her investigative journalism work on a series exposing corruption within local government bodies. Her in-depth reporting and ability to uncover hidden truths were widely praised in the Dutch media landscape.

In 2012, Claar van der Kalff joined NRC Handelsblad, where she expanded her focus to include international news and complex investigative pieces. Her work during this period was marked by a deep dive into political and economic issues, earning her recognition among peers.

Claar van der Kalff began her journalism career at De Telegraaf, one of the largest daily newspapers in the Netherlands. During her time there, she honed her skills in investigative reporting and covered a range of domestic news stories, establishing herself as a promising journalist.