A "qualified technician" is someone who has undergone proper training and education in a specific field and has the necessary skills and knowledge to carry out a particular task or job successfully. Full definition
You might still get insurance, if you can demonstrate that the house was built to certain design specifications and was constructed by qualified technicians. (padtinyhouses.com)
Well - qualified technician with not only great depth of experience, but also with excellent breadth. (members.climber.com)