R1:
- 2 medium level leetcode problems (30 mins and 45 mins)

R2:
- Questions about experience, whats and whys
- Given a function sendMessage(sender, message), how to implement scheduled message functionality

R3:
- How does concurrent hashmap work?
- What is https and explain its working and benefit
- What is jwt auth? What is oAuth?
- What are spring interceptors and filters and what's the difference.

R4:
Given a system, say twitter, how to create a blacklist checking mechanism. For each country, see whether govt has blacklisted the IP using a govt provided API that returns yes/no when IP is provided.
If an IP is blacklisted, don't allow access to the system. Blacklist updates every 24 hours.
What's the best implementation for scale?

Question

R1: 
- 2 medium level leetcode problems (30 mins and 45 mins)

R2: 
- Questions about experience, whats and whys
- Given a function sendMessage(sender, message), how to implement scheduled message functionality

R3:
- How does concurrent hashmap work?
- What is https and explain its working and benefit
- What is jwt auth? What is oAuth?
- What are spring interceptors and filters and what's the difference.

R4:
Given a system, say twitter, how to create a blacklist checking mechanism. For each country, see whether govt has blacklisted the IP using a govt provided API that returns yes/no when IP is provided.
If an IP is blacklisted, don't allow access to the system. Blacklist updates every 24 hours.
What's the best implementation for scale?

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