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Ironclad Interview Questions

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

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1
CodingStart here. 5 questions · ~44 min
2
Pipelines4 questions · ~35 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityIronclad
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3
Execution5 questions · ~44 min
Manage Technical Debt DeliberatelyMedium

Explain how you would prioritize and execute technical debt work without losing stakeholder alignment or delivery momentum.

Trade-offsRisk AssessmentScope ManagementIronclad
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4
System Design5 questions · ~44 min
Design Feature Drift Monitoring SystemHard

Design a production ranking system with robust feature drift monitoring across batch and real-time features at high QPS.

Feature StoreFeature DriftModel ServingIronclad
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5
Metrics4 questions · ~35 min
Compare CAC Against LTVMedium

Calculate CAC and compare it with LTV to decide whether an acquisition campaign is economically viable.

CACcampaign viabilityLTVIronclad
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6
Machine Learning3 questions · ~26 min
Bias-Variance in Model SelectionMedium

Explain how the bias-variance tradeoff guides model selection and generalization.

Cross-ValidationBias-Variance TradeoffRegularizationIronclad
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7
More topics24 questions · ~210 min
Choose Between RAG and Fine-TuningEasy

Compare RAG and fine-tuning, and decide when each is the better fit for an LLM product.

Ironclad
Evaluate Imbalanced Classification ModelMedium

How to evaluate a classification model when the classes are heavily imbalanced.

PrecisionAUC-ROCRecallIronclad
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.