As a recent hire junior developer, here's a summary of what I did to prepare.
- Algorithm: Solved from Baekjoon up to Gold 5, and mastered Programmers level 3.
- SQL: Solved up to HackerRank Medium, focused on indexes and joins.
- CS: Organized OS and network interview questions in Notion and memorized them thoroughly.
Honestly, I felt that theory was more important than practical work. If you can't pass a coding test, your credentials are useless. Good luck!