toteuttaneen
The word "toteuttaneen" is a Finnish grammatical form. It is the past active participle in the genitive case of the verb "toteuttaa". The verb "toteuttaa" means to implement, execute, fulfill, or realize. Therefore, "toteuttaneen" refers to "having implemented" or "having fulfilled" something, and it functions as an adjective or part of a larger grammatical construction where the genitive case is required.
In Finnish grammar, participles are verb forms that can function as adjectives. The past active participle
For example, one might encounter "projektin toteuttaneen henkilön" which translates to "the person who had implemented