Amazon's SDE levels and approximate total compensation ranges:
SDE I (L4): Base \130$175$180$28002$ years experience.
SDE II (L5): Base \150$185$250$400$K. Most common hire level.
Senior SDE (L6): Base \160$185$350$550$K.
Principal (L7): Base capped. Total comp \500$1$M+. Rare external hires.
Amazon caps base salary at approximately \185$K. Everything above that comes from RSU grants and sign-on bonuses.