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Updated weekly · Last refresh Aug 30

1X Technologies AS Research Engineer Interview Questions

The questions to prepare for a 1X Technologies AS Research Engineer interview. Questions from real interview reports rank first. Updated weekly.

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1
CodingStart here. 4 questions · ~39 min
Merge Two Sorted ArraysEasy
Practice

Merge two sorted arrays into one sorted array using a two-pointer linear scan.

ArraysSortingTwo Pointers1X Technologies AS
Check Binary Tree BalanceEasy
Practice

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

RecursionSearchingTrees1X Technologies AS
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2
Pipelines3 questions · ~29 min
Version Control for ML ModelsMedium

Tests MLOps practices for reproducibility, traceability, and safe iteration of models.

InfrastructureData ModelingQuality1X Technologies AS
Database Trade-offs for Large DataMedium

Tests ability to choose storage systems based on workload, consistency, and performance needs.

InfrastructureData ModelingQuality1X Technologies AS
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3
Behavioral & Leadership7 questions · ~69 min
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4
More topics6 questions · ~59 min
Supervised vs Unsupervised LearningEasy

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

Unsupervised LearningFeature EngineeringBias-Variance Tradeoff1X Technologies AS
Reinforcement Learning Environment DesignHard

Tests ability to model RL environments, define rewards, and ensure training realism and stability.

ML RankingModel ServingRecommendation Systems1X Technologies AS
ML Model KPI MetricsEasy

Tests understanding of evaluation metrics and how to choose them for ML model performance.

PrecisionAccuracyRecall1X Technologies AS
Bayes Theorem ExplanationMedium

Evaluates your understanding of Bayesian probability and how Bayes' theorem is formulated.

probability1X Technologies AS
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