xAI loop prep

OfficialxAIby Frontier Interview

The loop in order: the recruiter call, the coding screen, practical coding, system design, then hiring manager and project deep dive.

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  1. How do you use AI in your work?
    BehavioralReference answer: Frontier Interview's solution
  2. Anthropic OA: leveled in-memory record store
    CodingReference answer: Frontier Interview's solution
  3. Implement an LRU cache
    CodingReference answer: Frontier Interview's solution
  4. Find bad GPU nodes with group tests
    CodingReference answer: Frontier Interview's solution
  5. Sort an array with k worker threads
    CodingReference answer: Frontier Interview's solution
  6. Per-user token bucket limiter with interval refills
    CodingReference answer: Frontier Interview's solution
  7. Radix cache for integer sequences with LRU eviction
    CodingReference answer: Frontier Interview's solution
  8. Key-value store with nested transaction rollback
    CodingReference answer: Frontier Interview's solution
  9. Merge known bigrams in a sentence, leftmost first
    CodingReference answer: Frontier Interview's solution
  10. Design a rate limiter
    System designReference answer: Anonymous engineer's solution
  11. Design a notification system
    System designReference answer: Frontier Interview's solution
  12. Design a RAG system over company docs
    AI systemReference answer: Frontier Interview's solution
  13. Design ChatGPT
    AI systemReference answer: Frontier Interview's solution
  14. Build your story bank
    BehavioralReference answer: Frontier Interview's solution
  15. Project deep dive: present a project you led
    BehavioralReference answer: Frontier Interview's solution