Generally speaking, as a relay worker, this is the way to evaluate the professional title: (bachelor degree)

Assistant engineer (first year)-engineer (fifth year)-junior high school (this has no fixed number of years, but it is usually five years)-senior high school (this is generally difficult to teach)

Senior Engineer (first year)-Technician (fourth year)-Senior Technician (seventh year)

In addition, you can obtain the following certificates:

Safety Engineer (3 years)

Registered electrical engineer (theoretical basis in the second year, power transmission and distribution in the third year)

First-class and second-class constructor (first-class 3 years, second-class 1 year)

Supervision engineer (5 years), equipment manager (10 years), industrial engineer (with engineer certificate)

The more certificates, the better, but be careful when registering. I hope I can help you ~