I guess the maxim "traduttore traditore" has never been more true.

Some folks run away from literal translation as if it were something to be avoided at all costs. I don't get it. Anyway, by getting "creative" with translation we increase the the likelihood of committing translation blunders. I have no problem of getting literal and that's exactly what I recommend in this particular case. There are plenty of uses of "electrotechnical technician" online:
https://www.google.com/search?q="electrotechnical technician...

I don't see any possibility of translating this other than resorting to a literal translation.

I am well aware that Check these out:

Example Sentences

Are you a technician looking for a challenging professional experience to further your career? If so, joining CERN’s Technician programme may very well give you that challenge. This position as a Electrotechnical Technician is part of our prestigious TTE programme. https://www.impactpool.org/jobs/764134

European Council for Nuclear Research is hiring Electrotechnical Technician - Automation (TTE Programme) - Geneva.
https://www.unjobnet.org/jobs/detail/36867071

And here's one from the Washington, DC-based Urban Institute:

Colleges providing RTI that we spoke with are experiencing growth in STEM apprenticeships. A
representative of a state technical college described how their chemical operator apprenticeship
program, which started at only five apprentices in 2017, grew to over 100 apprentices in 2018. That
recent growth would not have been captured in the RAPIDS data reported in this study. The same
college provided RTI for apprenticeships in industrial maintenance for a paper company and an
electrotechnical technician program, and was starting a new IT apprenticeship program.
https://files.eric.ed.gov/fulltext/ED595859.pdf

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Note added at 1 day 15 hrs (2023-09-30 01:34:04 GMT)
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Please ignore the "I am well aware" part.

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Note added at 1 day 15 hrs (2023-09-30 01:37:21 GMT)
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Please note: a "técnico" (technician) is not to be confused with an "engenheiro" (engineer). They ARE NOT synonymous.

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Note added at 1 day 17 hrs (2023-09-30 04:13:20 GMT)
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Alternative translation: electrotechnical technician course.

In 2019, 865 people attended distribution electrician and electrotechnical technician courses in our School of Energy. https://api.mziq.com/mzfilemanager/v2/d/60f49a2d-bd8c-4fd9-9...