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ServiceNow Software Engineer Interview Questions

The questions to prepare for a ServiceNow Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

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LRU Cache for Fast RetrievalMedium

Implement an LRU cache using a hash map and doubly linked list to support O(1) get and put operations.

Hash TablesSearchingSorting
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Merge Overlapping Intervals
Medium

Merge overlapping intervals by sorting start times and greedily extending the current range.

CodingtechnicalProgramming
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Understanding ACID Properties in DatabasesMedium

Explain the ACID properties of database transactions and their importance.

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Processes, Threads, and Deadlocks
Medium

Assesses understanding of concurrency fundamentals and deadlock prevention or handling.

synchronizationdeadlock
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Vending Machine State Model
Medium

Tests object-oriented modeling and state machine design for inventory, pricing, and transactional correctness.

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Scalable Messaging Architecture
Hard

Evaluates system design for real-time messaging scalability, persistence, and reliable delivery.

scalabilityarchitecture
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OSI Model Relevance
Medium

Assesses knowledge of network layering and how the OSI model helps reason about communication.

Networkingprotocols
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Role of the Kernel
Medium

Tests understanding of OS architecture and the kernel's responsibilities.

system architectureOperating Systems
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