This is the 4845th most frequent Turkish word.
ekleyen
"Adding" or "the one who adds."
The word 'ekleyen' is used here as a present participle meaning 'adding', describing the person performing the action.
Dosyaya yeni bilgiler ekleyen kişi çok dikkatli olmalıdır.
The person adding new information to the file must be very careful.
In this sentence, 'ekleyen' functions as an adjective describing the 'öneriler' (suggestions), implying that they were ‘added’.
Ekleyen öneriler sayesinde proje daha kapsamlı hale geldi.
Thanks to the added suggestions, the project has become more comprehensive.
'Ekleyen' again serves as an adjective in this sentence, qualifying 'kodlarımız' (our codes) indicating that they were added recently.