Just for clarification here are the 'C' rating experience requirements - Whether that makes you an 'Engineer' is not a debate I want to enter into!
66.A.30 Experience requirements
3. for category C with respect to large aircraft:
(i) three years of experience exercising category B1.1, B1.3 or B2 privileges on large aircraft or as Part-145 B1.1,
B1.3 or B2 support staff, or, a combination of both; or
(ii) five years of experience exercising category B1.2 or B1.4 privileges on large aircraft or as Part-145 B1.2 or
B1.4 support staff, or a combination of both; or
4. for category C with respect to non large aircraft:
three years of experience exercising category B1 or B.2 privileges on non large aircraft or as Part-145 B1 or B.2
support staff, or a combination of both; or
5. for category C obtained through the academic route:
an applicant holding an academic degree in a technical discipline, from a university or other higher educational institution recognised by the competent authority, three years of experience working in a civil aircraft maintenance environment on a representative selection of tasks directly associated with aircraft maintenance including six months of observation of base maintenance tasks.
regards
The Doc