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Prep plan
Updated weekly · Last refresh Oct 17
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Durlston Partners Software Engineer Interview Questions

The questions to prepare for a Durlston Partners Software Engineer interview. Questions from real interview reports rank first. Updated daily.

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1
CodingStart here. 8 questions · ~71 min
Cycle Detection in GraphsMedium
Practice

Detect cycles in a disconnected directed dependency graph using iterative depth-first search and three-color state tracking.

cycle detectionDDurlston Partners
Circular Buffer ImplementationMedium

Tests practical coding ability for performance-oriented buffering patterns.

efficiencydata storageDDurlston Partners
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2
System Design9 questions · ~80 min
Risk-Checking Sub-Millisecond ServiceHard

Tests ability to design ultra-low-latency services with appropriate data, concurrency, and failure handling.

latencyarchitectureDDurlston Partners
High Availability for Trading PlatformMedium

Tests knowledge of redundancy, failover, and operational practices for mission-critical trading systems.

high availabilitystrategyDDurlston Partners
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3
Security & Infrastructure8 questions · ~71 min
Lock Contention OptimizationHard

Tests ability to improve concurrency performance through synchronization and workload design.

multithreadingoptimizationDDurlston Partners
Debugging Race ConditionsHard

Evaluates systematic debugging methodology for concurrency issues across distributed components.

distributed systemsDebuggingrace conditionsDDurlston Partners
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4
More topics3 questions · ~27 min
Python Trade-Offs in High-Frequency TradingMedium

Evaluates practical judgment about language choice for latency, throughput, and operational constraints.

Trade-offspythonDDurlston Partners
Memory Limits in BacktestingHard

Evaluates strategies to manage resource constraints while maintaining correctness in backtests.

DDurlston Partners
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