career technician; person in the technical field
Refers to someone whose career or professional background is in a technical or engineering domain, often contrasted with administrative or sales roles. The 畑 metaphor implies a field of expertise.
He's a technical person, so he doesn't know much about sales.
We need someone from a technical background for this project.
技術者 is a more formal term for an engineer or technician, while 技術畑の人 emphasizes the person's career path or background.
畑違い means 'out of one's field' and uses the same 畑 metaphor. 技術畑の人 is a specific application of this metaphor.
Compound of 技術 (technology) + 畑 (field, as in area of expertise) + の (possessive particle) + 人 (person). The 畑 metaphor is common in Japanese for describing one's professional field.