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Updated weekly · Last refresh Aug 30

66degrees Software Engineer Interview Questions

The questions to prepare for a 66degrees Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
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1
CodingStart here. 15 questions · ~131 min
Efficient Nested JSON ParsingHard
Practice

Flatten nested JSON into path-value pairs using iterative depth-first traversal with O(n) time and controlled stack space.

data parsingpython66degrees
Choosing Core Data StructuresEasy

Explain when to use arrays, hash tables, trees, and graphs in coding interview problems and the tradeoffs behind each choice.

Hash TablesArraysTrees66degrees
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2
Execution14 questions · ~122 min
Walk Through Your Last Data ProjectEasy

Describe your most recent data engineering project with focus on stakeholder alignment, technical decisions, risks, and measurable outcomes.

Trade-offsRoadmappingScope Management66degrees
Choose Monolith or MicroservicesMedium

Evaluate the execution trade-offs between monoliths and microservices and explain how you would choose the right approach.

Trade-offsRisk AssessmentScope Management66degrees
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3
Pipelines11 questions · ~96 min
Design Scalable Pipeline InfrastructureHard

Design the core pipeline infrastructure for a new project, with attention to orchestration, data quality, idempotency, and future scale.

InfrastructureToolsQuality66degrees
Cloud AI Deployment Pipeline ExperienceMedium

Discuss experience building cloud-based AI pipelines, including orchestration, processing patterns, infrastructure choices, and data quality controls.

InfrastructureToolsQuality66degrees
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4
System Design6 questions · ~52 min
GKE Ingress Solution ScenarioHard

Tests your ability to design an ingress solution for Kubernetes on GKE based on requirements.

kubernetessolution design66degrees
Relational vs NoSQL for ClientsMedium

Assesses your trade-off thinking for data modeling and storage choices in client work.

relational databases66degrees
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5
Behavioral & Leadership4 questions · ~35 min
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The finish line: interview-readyComplete all 50 questions to finish this plan.