You must have worked in category zero, which is for managers or category A, which is for professionals or category B, which is also for some professionals, and primarily for high-skilled workers. When submitting a Canadian permanent residency application under the Express Entry system, one of the requirements is that you must have worked in one of the prescribed NOC code categories. Every job that exists in Canada has a code assigned to it by the government known as a National Occupational Classification code. The National Occupational Classification (NOC) code is Canada’s way of identifying the different types of jobs or occupations that exist. What is the National Occupational Classification (NOC) Code? This is a crucial part of any Express Entry application where an applicant indicates the occupation they have worked in while gaining their work experience. One of the challenges that many persons encounter when applying for Canadian permanent residency under one of the Express Entry programs is in identifying and indicating their National Occupational Classification (NOC) code.