5 +경력이라서 sde2였는데 저한테 senior란 표현을 하더군요. 시스템디자인은 https://www.educative.io/courses/grokking-the-system-design-interview/
https://github.com/donnemartin/system-design-primer/blob/master/solutions/system_design/web_crawler/README.md
유튜브 tech dummy 강추합니다.