~での (composite particle)

The composite particle stack ~での: で (location of action / means / instrumental) + の (attributive/genitive), turning a で-phrase into a noun modifier — 'the [Y] at/with X.' で alone modifies a verb; ~での lets it modify a noun. 銀行での仕事 ('work at the bank'), 海外での経験 ('experience abroad'), 学校での生活 ('life at school'), 鉛筆での書き方 ('writing with a pencil'), 日本語での会話 ('conversation in Japanese'). The で keeps its locative or instrumental sense; the の links the resulting phrase to its head noun.