Amazon
3 rounds total

1. On phone tech screen
2. OA (two questions, given 90 minutes, finished all in 1 hour)
3. Onsite. 4 rounds. Each round is 50 minutes. Around 20 minutes BQ and 30 minutes tech questions. 1 round was system design and other 3 were coding.

Signed NDA, cannot provide too much details. Overall, I don't think L5 is very hard.
I only prepared 3 months on leetcode (2 - 3 hours a day) and got offer from both Amazon and Microsoft.
My suggestion for Amazon and Microsoft intervewee is "ace 3 problem sets: Amazon, Microsoft, and Most Popular Medium". You need to be able to write beat 90% solution in less than 20 minutes. Just keep reviewing these 3 problem sets, only 150-ish problems total, not need to eager on new problems.

8 YOE totaly, 6 years in a small company, 2 years in a medium size company.
base 155,000
sign on 79,000 + 60,000
stock 89
on avg about 230k TC

Microsoft
Onphone + Onsite
Onsite has 4 rounds, 45 minutes each.
Only 190k TC, forgot the detail numbers. Decided to go to Amazon.