In some contexts, people might use phrases like “shoeshine engineer” to humorously describe someone who appears to be overqualified or underutilized in their job. It could be a way to highlight the mismatch between a person’s skills or qualifications and the tasks they are assigned.
If you have a specific context or details about the “shoeshine engineer” that you’re curious about, feel free to provide more information, and I’ll do my best to help!