Tips
Thumb Rule.
Dont fail to deliver a working model they will mention as time management issue. Make a linear way to build a system.
System Up time say 99.99% available (52 mins down in a year).
1 year = 360 days * 24 hours * 60 mins = 525600 mins.
99.99% up time = 0.01% downtime.
0.01% of 520000 = 52 mins.
99.999% uptime = 0.001% downtime = 5 mins.
Load Balancer be set anywhere between user and web server, web server and application server, application server and database server.
Understand the expectation.
Midlevel.
Breadth - Make the system functional and make part of the system is abstract which is surface level functionality.
Probing the basics - Interview will not assume that you know the basics and they will ask question. Time permits explain a little bit to gain the confidence from the beginning. Example mentioning API gateway say a little bit on what it perform in the system. Collect good points. 😜
Drive and take the backseat - The first part drive the interview and you might not able to see some issue so whe the point out take the backseat and let them ask question and then again come to the driving seat at the later part of the design. You know solid ending.