Background
Working as software engineer at a trading firm with around 1.5 years experience. Solved 384 questions, with on and off preparation over 2 years.

Google Phone (Reject)
Recruiter has been in touch over the last 2 years. This was the third time for another Phone. Never been to onsite including this one. I thought I was well prepared, but interviewed with youtube team. Honestly, I feel I shouldn't have done this. Youtube is one of the hardest teams to get into at google.

Also did the foo bar challenge to get the interview call this time. Just kept googling foo bar, and signing up with my email, got the challenge after around 1.5 months. If you solve 3 questions, you're guaranteed a phone screen.

Phone -
Write the compiler for the language which has following set of rules (I don't remember the exact rule since its been 3 months I interviewed) -
1) T(N) - *,-,/,+
2) F(N) - function of T(N)

Example -
1) ( (( ( + 5) ab)) ) -- Answer will 5. Ignore spaces, non numeric numbers.
2) ( + 5 5 5 ( - 10 ) ( ( ( + 2 2 ) + 2 ) ) ) - 11

Thought it similar to below but couldn't solve it.
https://leetcode.com/problems/decode-string/

4's a charm. Recruiter reached out to interview again next year.

Amazon Onsite (Reject)
Recruiter reached out via hired. Interviewed with prime video team.

Online assessment -
Easy BFS based questions, from the repository itself.
https://leetcode.com/discuss/interview-question/344650/Amazon-Online-Assessment-Questions

Onsite -

1. https://leetcode.com/problems/design-in-memory-file-system/
2. OOPS - Design a game of cards, the game had simple rules. I think I didn't do well in this.
3. You're given a set of values for prices (5, 10, 15, 17, 20), find the minimum way to get to target price.
4. Binary Search with decimal. How do you find 5.000003 from range 1 to 100. Complexity trade-offs etc.

Reject. The recruiter said it was a close call, but they decided not to move forward this time. To stay in touch and try again next year.

Axon Offer
Assessment --
BFS based question

Onsite --

1. https://leetcode.com/problems/insert-delete-getrandom-o1/
2. Employee heirarchy with queries. SImilar to tries and https://leetcode.com/problems/design-in-memory-file-system/.
3. Design question on 911 system.

Bloomberg Offer
This was an interesting case. First, the recruiter reached out for normal Software Engineer role, and I applied, but got rejected without an interview. Following has, had a referral but same outcome.
It was quite unbelievable since its very unheard of getting reject once the recruiter reaches out and asks you to apply, without a phone interview/assessment.

After this, was just chilling and had received an amazon reject when I applied for a Senior engineer role. Recruiter reached out and scheduled a phone interview. Also, told me another team is hiring, and scheduled a phone interview for that also. This was again surprising since I just have over an year of experience, and don't think myself to be a fit for Senior engineer. Went ahead anyway.

Phone with both teams -

1. https://leetcode.com/problems/design-underground-system/
2. Find bottomost expression from the bracket pairs (constant space and O(N) time)
   ( abc ( ( bc) (de) ) ) -- {bc, de}
   ( abc ( ( ( a) ) hg) ef ) -- {a}

2 Onsites with each team -

1. Similar to coin exchange problem
2. Browser History - This was difficult, as it had multiple follow ups, ranging from browser history per employee, browser history per department, space time trade offs.
3. Merge K Linked Lists
4. https://leetcode.com/problems/copy-list-with-random-pointer/
5. Design - Traffic light system.

Gave a heads up to second team regarding the previous questions I've been asked by the other team, so as to avoid duplicates. I think that showed good also.

Recruiter reached out after a week. They generally reach out within 2 days if its an offer, so I thought nothing good is coming. However, the feedback was design was weak but problem solving was good, so they'd like me to come as normal Software engineer and not Senior.

Accepted the offer.