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~2h total · Updated weekly · Last refresh Aug 9

HackerRank Backend Engineer Interview Questions

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

Two Sum Variation with HashMapsMedium

Assesses problem-solving with hash maps and careful edge-case handling.

two sumfunctions
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Refactor Multi-File Backend Code
Medium

Assesses ability to modify and extend a backend codebase safely and cleanly.

refactoringfunctions
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String Constraints Checker
Medium

Evaluates ability to implement constraint checks efficiently and correctly.

StringsArray Manipulation
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Top-K Elements with Heap
Hard

Tests knowledge of heap-based algorithms and complexity-aware implementation.

Algorithmstop kHeap
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High-Concurrency Code Execution Service ArchitectureHard

Assesses system design for safe, scalable execution under heavy concurrent load.

architecture
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Multi-Tenant Database Schema Optimization
Medium

Assesses data modeling, indexing strategy, and multi-tenant considerations.

database design
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Design CRUD API for Trading
Medium

Evaluates API design skills including endpoints, models, and request/response structure.

system design
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Low-Latency High-Throughput Architecture
Hard

Tests system design tradeoffs for performance, scalability, and reliability at HackerRank.

low latencythroughputoptimization
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