One pro tip for acing a system design interview is to read the engineering blog of the company you are interviewing with. You can get a good sense of what technology they use, why the technology was chosen over others, and learn what issues are important to engineers.
System design interview tip
1. The Infrastructure Behind Twitter: Scale https://blog.twitter.com/engineering/en_us/topics/infrastructure/2017/the-infrastructure-behind-twitter-scale
2. Discovery and Consumption of Analytics Data at Twitter https://blog.twitter.com/engineering/en_us/topics/insights/2016/discovery-and-consumption-of-analytics-data-at-twitter
3. The what and why of product experimentation at Twitter
https://blog.twitter.com/engineering/en_us/a/2015/the-what-and-why-of-product-experimentation-at-twitter-0#:~:text=Experimentation%20is%20at%20the%20heart,their%20ideas%20seamlessly%20and%20rigorously.
4. Twitter experimentation: technical overview https://blog.twitter.com/engineering/en_us/a/2015/twitter-experimentation-technical-overview