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💻 Coding Round🏗️ System Design🧠 Behavioral (STAR)

Ananya Rao · Staff Engineer @ Google India🎙️ Asking Question...

INTERVIEWER PROMPT:

“How do you design a thread-safe LRU Cache with O(1) get/put and TTL expiration under 100k QPS?”

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💡 REAL-TIME ANSWER BLUEPRINT (0.38s):

Use a Doubly Linked List paired with ConcurrentHashMap for O(1) lookups. To support TTL expiration efficiently without O(N) sweep locks, combine a Min-Heap or bucketed wheel timer with lazy expiration during get() operations.

class ThreadSafeLRUCache:
  def __init__(self, capacity: int, ttl_sec: int):
    self.cap = capacity
    self.map = {}
    self.lock = threading.RLock()
    # O(1) lock-free read path + doubly linked eviction...

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