Whilst I don't necessarily disagree with the point you are working towards, I don't follow your pedantic breakdowns of various endeavors.
"Drawing" the blueprints would be done by a draftsman not necessarily an engineer, working a crane is a skilled job done by crane operators (again not necessarily engineers), and brick laying/pavement sealing/bridge sweeping is again not necessarily done by an engineer.
In building a bridge, the "engineering" is done by the civil engineer who designs the bridge, chooses and calculates its construction: "applying scientific knowledge, mathematics and ingenuity to develop solutions for technical problems."
Similarly, a datacenter may be considered a feat of engineering, but the construction (read: design) of the datacentre is done by civil/structural engineers and is separate from this argument (although this may not have been what you were getting at, my interpretation was that you were initially including the building in your point).
I would argue that if a janitor was to optimise his/her route by counting steps, this is not a technical problem and so doesn't make him an engineer.
"Drawing" the blueprints would be done by a draftsman not necessarily an engineer, working a crane is a skilled job done by crane operators (again not necessarily engineers), and brick laying/pavement sealing/bridge sweeping is again not necessarily done by an engineer. In building a bridge, the "engineering" is done by the civil engineer who designs the bridge, chooses and calculates its construction: "applying scientific knowledge, mathematics and ingenuity to develop solutions for technical problems."
Similarly, a datacenter may be considered a feat of engineering, but the construction (read: design) of the datacentre is done by civil/structural engineers and is separate from this argument (although this may not have been what you were getting at, my interpretation was that you were initially including the building in your point).
I would argue that if a janitor was to optimise his/her route by counting steps, this is not a technical problem and so doesn't make him an engineer.