03
Core Knowledge
The fundamentals interviewers assume you have: concepts, SQL, security, concurrency, and design.
0 done— accuracy
Concepts
Recall-style: think first, then reveal. No multiple choice.
110 questions
Flashcards
Pattern definitions and when to use them, self-rated.
25 patterns
Systems & Concurrency
Concurrency, distributed, database, networking scenarios.
44 scenarios
SQL
Schema plus question: JOINs, windows, NULL traps.
15 drills
Security
OWASP, auth, JWT, CSRF. What seniors are assumed to know.
15 questions
OOP Design
Parking lot, elevator, chess. Design the classes, compare.
10 prompts
Shuffle all 6 modes
$ drill core-knowledge --random