Ah I see why you're getting so much disagreement in this thread. Software job titles have no precise definitions in my experience. It would never occur to me to

Ah I see why you're getting so much disagreement in this thread. Software job titles have no precise definitions in my experience. It would never occur to me to be astonished that a Software Engineer doesn't know something, while being unfazed by a Software Developer with the same knowledge and experience. ICs most often don't even pick their own titles; the company comes up with whatever they feel like.