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Open Systems Technologies Interview Questions

The questions to prepare for Open Systems Technologies interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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1
CodingStart here. 3 questions · ~26 min
Reverse Linked List ComplexityEasy
Practice

Reverse a singly linked list in place using pointer reassignment with O(n) time and O(1) extra space.

time complexityLinked ListsData StructuresOpen Systems Technologies
Difference Between Interface and Abstract Class in JavaMedium

Explain the differences between interfaces and abstract classes in Java and when to use each.

Hash TablesArraysStringsOpen Systems Technologies
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2
Execution3 questions · ~26 min
Design a Microservices Migration PlanHard

Plan a microservices migration by balancing delivery speed, service boundaries, and operational risk.

Trade-offsRisk AssessmentScope ManagementOpen Systems Technologies
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3
Behavioral & Leadership29 questions · ~247 min
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4
More topics6 questions · ~51 min
Consistency Across Data SourcesMedium

Approach for keeping records aligned and trustworthy when multiple source systems feed the same pipeline.

InfrastructureQualityOpen Systems Technologies
Design ML-Driven Cache RankingHard

Design an ML-based caching system for a high-traffic e-commerce app that optimizes admission, refresh, and eviction under tight latency and freshness constraints.

InfrastructureModel ServingQualityOpen Systems Technologies
Optimize Production Query LatencyHard

Tests your approach to diagnosing and improving SQL performance under real production constraints.

performancequery optimizationdata integrityOpen Systems Technologies
Prospecting and Cold CallingMedium

Assesses your ability to generate pipeline through outbound prospecting and cold outreach.

cold callingOpen Systems Technologies
Reviewing Your Recent ExperienceMedium

Evaluates how clearly you summarize your recent experience and relevant finance exposure.

experienceOpen Systems Technologies
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