Many parishes and parish unions have posted summer and seasonal job adverts at KirkkoRekry. Some parishes might inform about their job openings only locally.
So go check KirkkoRekry if some of the places would interest you! There is a variety of places available corresponding to different work and educational experiences. Some postings might require that the applicant is a student in the field, but there are many postings where this isn’t a requirement.
So turn your thoughts towards summer and apply!