In the first stage, you submit your profile in the pool of candidates where the Comprehensive Ranking System (CRS) awards points on the primary basis of age, level of education, language proficiency (English and French), and work experience.
Your profile will remain active in the pool for one year from the date of submission. If you receive an Invitation to Apply (ITA) within this period, you may move to the next stage. However, if you do not receive an ITA and are still interested in pursuing your immigration prospects, you can re-enter the pool with a new profile again.
Upon receiving the ITA, the second stage involves justifying the points you claimed in the first stage of the process and applying for permanent residency. Keep in mind, submitting a profile to the Express Entry pool does NOT mean applying for permanent residence.
Anyone who satisfies the prerequisites based on work experience, language proficiency, education, and age is eligible to create a profile under the Express Entry system. Creating a profile is free of cost.
However, to receive an ITA from ICCRC under any of the programs of the Express Entry, a competitive CRS score is usually required, which should be above the Express Entry draw cut-off. Typically, the Canadian Government conducts a draw once every two weeks.
To answer this question precisely, No. However, having a valid Canadian job offer may give you an additional 50 / 200 CRS points in the Express Entry system, increasing your overall CRS score substantially.