GR translation: veteran automotive jobber Edouard Sanktwolke

[Mike Jing]

V385.38-386.2, P392.5-10   Most of the transportation was furnished through
the expertise of veteran automotive jobber Edouard Sanktwolke, who could
hot-wire anything on wheels or caterpillar tracks—even packed around a
custom-built ebony case full of the rotor arms, each in its velvet recess,
to every known make, model, and year, in case the target’s owner had
removed that vital part.

What does "automotive jobber" mean here?