FANG engineers are typically in the 99th percentile of tech excellence. Amazon engineers are not well paid when compared to professionals of the same league. Amazon SDE1s in Austin, Texas have a salary of around $120k/year and new hires have a total compensation package of around $160k/year. In Europe salary ranges for the same role go from €80k/year in northern countries and €40k/year in southern European countries. Check Glassdoor.
We're discussing positions and professionals which compete in a global stage.
Amazon is far from well paid for this sort of position. It's one of the key factors why Amazon SDEs tend to bail out after 2 or 3 years. They are smart enough to not bother with high stress, low-paying jobs .