No.
For an employee to be able to benefit from the SSM for skilled workers, he must have been recruited to perform work involving a professional qualification usually acquired through teaching or training evidenced by an official certificate, that is to say recognised by the Luxembourg State, and which is at least of the level of the Technical and Vocational Aptitude Certificate (CATP) awarded in technical secondary education.
The qualification must therefore relate to the occupation actually performed by the employee.
Thus, if an employee was engaged for work which did not call for professional qualifications, he cannot thereafter rely on qualifications in order to have his wage increased.
Nota Bene
What counts is what was agreed between the parties in the employment contract.
It is on the basis of the functions actually performed by the employee that his status as a skilled or unskilled worker is determined, with a view to setting the social minimum wage rate that he may claim.
By virtue of the principle that remuneration is a fair quid pro quo for services rendered, an employee must be remunerated by reference to the functions actually carried out in the company regardless of any higher qualification.
If the employee performs work which calls for a qualification, even though that work is not mentioned in the contract, it is incumbent upon the employee to prove that during the period of his engagement he performed such work.