Usually you would get a call from the HR department for an initial screening. Most of the questions asked by HR are basic behavioural and few questions related to your eligibility to work in Canada or travel to US. After you clear that round, you are contacted by HR again to schedule an in-person or phone interview within a week of HR interview. Usually in-person interview will be done by 2-3 senior engineers. Each interview will take about 1 hour. If you are going to be interviewed at Burlington office and you don't drive, pack up some food beforehand. There aren't any restaurants within walking distance, and you are going to be very hungry after long interviews. If your interview goes well, you will likely hear back from HR with an offer letter within 2-3 weeks.