Before entering European politics, Alametsä has been a city councillor of Helsinki and chairs its equality committee.[1] She works as a project leader in the mental health organization Mental Health Partnership Finland (Mielenterveyspooli).[2]
Alametsä studied political science at the University of Helsinki from 2011 to 2014 graduating with a specialization in world politics. During her university studies, she was active in the student union and governance bodies, participating in several of their business ventures.
As a candidate for the Green League, Alametsä was elected to the Helsinki city council in 2017,[5] after an unsuccessful attempt in 2012. She ran unsuccessfully for parliament twice in 2015 and 2019. During that time, Alametsä campaigned for a law improving mental health issues.[6]