You will not face any problem as the company can make you change of profession from secretary to engineer once you attest your certificate from the qatar embassy in your country & ministry of foreign affairs in your country & again here from your country embassy in qatar & from ministry of foreign affairs in qatar, this process usually done in two month, if you are lucky you can check one of the offices doing this service here against charge, once this is done you can easily apply for change of profession & your company should do it for you, check with any of the HR in your company or any of the secretaries in the company they will give you more information.