1X Technologies AS Interview Questions

The questions to prepare for 1X Technologies AS interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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CodingStart here. 9 questions · ~88 min

Use postorder recursion to determine whether a binary tree is height-balanced in O(n) time.

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Machine Learning8 questions · ~78 min

Explain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.

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Execution9 questions · ~88 min

Balancing Speed Quality and ScopeHard

Describe a time you had to choose between speed, quality, and scope, and how you aligned stakeholders around the trade-off.

Trade-offsRisk AssessmentScope Management

1X Technologies AS

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System Design6 questions · ~58 min

Design an LLM Serving PlatformHard

Design an LLM serving system that balances latency, cost, scalability, and safety for production traffic.

Cold StartFeature StoreModel Serving

1X Technologies AS

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Model Evaluation5 questions · ~49 min

Approach to Underperforming ModelsMedium

Structured approach for diagnosing an underperforming model and deciding whether to fix data, thresholding, calibration, or the model.

PrecisionAccuracyRecall

1X Technologies AS

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Generative AI & LLMs3 questions · ~29 min

Reduce Hallucinations in LLM AnswersEasy

Explain LLM hallucination and give three practical ways to reduce it using grounding, prompting, and evaluation.

HallucinationPrompt EngineeringRAG

1X Technologies AS

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