Not sure what your native language is (for Spanish speakers "working on", "working in", "working at" could be a reasonable distinctions) but think the punchline

Not sure what your native language is (for Spanish speakers "working on", "working in", "working at" could be a reasonable distinctions) but think the punchline is that it's software "development" or "engineering" and not simply "IT". Although some may argue they all fall under the same general label as being IT (i'm not opinionated)