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In french, "je suis charrette" can be slang for "I am overloaded (with work)", in the same way as "I am on charrette" that the article mentions.

Native french speaker as well, and I've never heard or used it in software development.

However, I have multiple friends in Architecture schools, like INSA (Institut National des Sciences Appliquées), and it's widely used there

Chacun son expérience. C’est “définitivement”anecdotique.

Weird that you never heard it. Oh well. Why do I care.