SAN JOSE — Samsung lawyers often complain that their client is caught in the crosshairs of a fight between Apple and Google. Now, Googlers are standing directly in the line of fire.

A trio of Google engineers testified Monday in Apple and Samsung’s latest trial over smartphone and tablet technology. Many see Samsung as a proxy for Google in the protracted patent brawl, and the Mountain View company figures more prominently in the parties’ third jury trial than previously. Four of the five patents that Apple is asserting target features that are woven into Google’s Android operating system, which is used on Samsung phones.