openai
130 interview questions available
Design a Slack-like real-time messaging system
hard
Feb 12, 2026
Implement type AST and infer generics
hard
Feb 11, 2026
Design a crossword puzzle solver system
hard
Feb 11, 2026
Improve classifier with noisy multi-annotator labels
hard
Feb 11, 2026
Design a sandboxed cloud IDE
easy
Jan 22, 2026
Answer project deep dive and cross-functional questions
easy
Jan 22, 2026
Design a distributed crossword fill solver
nan
Jan 17, 2026
Implement a memory allocator with malloc/free
medium
Jan 9, 2026
Design a RAG system with evaluation
medium
Jan 6, 2026
Explain KV cache in Transformer inference
medium
Jan 6, 2026