Canadian job sites like job bank.
You need a job offer and your employer needs to file for and pay $1k for a LMIA. The LMIA shows that no Canadian or PR could be hired. Then with LMIA, you apply for a closed work permit. For the permit, you show that you are experienced to do the job. The process can take many months. Few employers go through the process and most posts will state that don’t bother applying if you don’t have work authorization or are Canadian/PR.