Persistent Backend Engineer Interview Questions
The questions to prepare for a Persistent Backend Engineer interview. Questions from real interview reports rank first. Updated daily.
Implement an O(1) LRU cache using a hash map and doubly linked list to evict the least recently used entry.
PersistentUse a hash map to find two array elements that sum to a target in O(n) time.
PersistentTests your consistency strategy across services, including transactions and eventual consistency.
PersistentAssesses understanding of request flow, throughput, and trade-offs in backend systems.
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Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.
PersistentExplain SQL vs NoSQL trade-offs, including schema design, consistency, scaling, and query flexibility.
PersistentOptimize a slow PostgreSQL query that aggregates completed transactions while preserving customers with no matching activity.
Capgemini
NomuraUse a window function to find each customer's second-highest transaction amount for a specified month.
PersistentReturn the highest non-NULL salary from the employees table using a simple aggregate.
PersistentAssesses performance troubleshooting and optimization for backend APIs.
PersistentEvaluates REST API security knowledge and practical mitigation techniques.
Persistent