At that time, SDEs were paid on a salary basis with additional compensation in restricted stock units (RSUs) that vested in the future based on how long you stayed with the company a.k.a "golden handcuffs".
SDEs worked about 50 to 60 hours during most of the year, 70 to 90 hours during an oncall / pager duty week, and 70 to 100 hours during Q4, the holiday season leading up to Christmas.
The pay was really good, the people I worked with were brilliant and amazing, and it was exciting to build awesome systems and see them make a difference in the company's operations and capabilities. At the same time, it starts to wear on you and your family after a few years. I am glad I did it, but it's not the type of job most people can do for more than a few years due to how much it requires and impacts your life.