Final answer:
Mr. Hardman is actually an engineer, as indicated by the clues provided that emphasize his proficiency in computer science and his preference to hire a painter rather than doing it himself.
Step-by-step explanation:
In reality, Mr. Hardman isn't a salesman; he is an engineer. This is evidenced by the fact that the engineer is described as being more skilled in computer science than in painting, suggesting a professional background in a technical field rather than sales. Given this context, it is clear that Mr. Hardman's true profession lies in engineering, which is also in alignment with the provided clue that he would prefer to hire a painter for his house, as his expertise and time are better invested in his engineering work.