Other interview questions

Showing 31–51 of 51 results

• Implement KNN from scratchMedium

  This question evaluates understanding of the k-Nearest Neighbors algorithm, distance metrics (Euclidean and cosine), tie-breaking with class priors, weighted voting, complexity analysis, and scalability strategies, testing competencies in algorithm implementation, model behavior, and computational trade-offs.

  OtherData ScientistCoding & AlgorithmsOnsite
• Implement Linear Regression TrainingMedium

  This question evaluates understanding of linear regression, mean squared error loss, gradient computation, parameter updates, and proficiency with vectorized numerical operations used in batch gradient descent.

  OtherMachine Learning EngineerCoding & AlgorithmsOnsite
• Implement a multi-button click detectorHard

  This question evaluates competency in real-time event stream processing, per-button state management, and timing-based classification of input events such as distinguishing single versus long presses.

  OtherSoftware EngineerCoding & AlgorithmsTechnical Screen
• Implement multiplication without using the multiplication operatorMedium

  This question evaluates proficiency in bitwise arithmetic, integer overflow semantics, sign handling, and algorithmic efficiency for implementing multiplication without using multiplication or division operators.

  OtherData ScientistCoding & AlgorithmsTechnical Screen
• Lowest Common Ancestor in an Explicit Binary TreeEasy

  Find the lowest common ancestor in a binary tree using explicit child arrays, including identical targets, ancestor targets, and deep trees.

  OtherSoftware EngineerCoding & AlgorithmsOnline Assessment
• Maintain Entry Numbers with Incremental Loads and Historical BackfillsMedium

  Design incremental per-context entry numbering with idempotent state, contiguous-gap backfills, and correct handling of interleaved late events.

  OtherAnalytics EngineerSystem DesignTechnical Screen
• Number Entries Within Each ConversationMedium

  Assign one-based entry numbers per conversation using timestamp and identifier ordering in a PostgreSQL window-function query.

  OtherAnalytics EngineerData Manipulation (SQL/Python)Technical Screen
• Optimal Stopping with a Ten-Sided Die and a ResetMedium

  Derive optimal stopping thresholds for a fair ten-sided accumulation game, then account for the continuation value of a one-time zero reset.

  OtherQuantitative ResearcherStatistics & MathTechnical Screen
• Predict job changes month by monthHard

  This question evaluates competency in discrete-time survival modeling and end-to-end predictive system design, encompassing feature engineering, label/hazard formulation, leakage prevention, model evaluation, fairness assessment, and experimentation for production machine learning.

  OtherData ScientistMachine LearningOnsite
• Prove reservoir sampling correctnessMedium

  This question evaluates randomized and streaming algorithm skills, including mastery of reservoir sampling, induction-based correctness proofs, probability reasoning, and complexity analysis for sampling under strict memory constraints.

  OtherData ScientistCoding & AlgorithmsOnsite
• Return the k-th row of Pascal-like triangleMedium

  This question evaluates combinatorics, array manipulation, and space-efficient algorithm design by requiring computation of a specific row of Pascal’s triangle without constructing the full triangle.

  OtherSoftware EngineerCoding & AlgorithmsOnline Assessment
• Separate demand from supply for jeansMedium

  This question evaluates a data scientist's ability to perform data-driven diagnostics, funnel-metric construction, quantitative decision-rule design, and experimentation planning to distinguish demand-side from supply-side constraints in a marketplace jeans category.

  OtherData ScientistAnalytics & ExperimentationOnsite
• Simulate via inverse transform and GibbsMedium

  This question evaluates understanding of random variate generation and Markov chain Monte Carlo techniques, specifically inverse-transform sampling for the Logistic(μ,s) distribution and Gibbs sampling for a bivariate joint density, testing competency in probability theory, distribution properties, and statistical computing within the Statistics & Math domain. It is commonly asked to assess the ability to derive inverse CDFs and full conditional distributions, verify sample correctness with goodness-of-fit and convergence diagnostics, and reason about sample size, burn-in, and thinning, reflecting a mix of conceptual understanding and practical application.

  OtherData ScientistStatistics & MathOnsite
• Solve a Set of Probability and Quantitative Reasoning ProblemsMedium

  Work through fourteen quantitative interview problems covering probability, counting, expectation, algebra, logical constraints, and rate reasoning. Each result should be auditable, use the correct sample space, and state any interpretation that affects the calculation.

  OtherSoftware EngineerStatistics & MathOnline Assessment
• Solve window-function SQL without joinsMedium

  This question evaluates proficiency with SQL window functions, including running and cumulative sums, LAG/forward-fill event logic, ranking functions (RANK/DENSE_RANK/ROW_NUMBER), tie-breaking strategies, and temporal date arithmetic for payments and subscription events.

  OtherData ScientistData Manipulation (SQL/Python)Technical Screen
• Spreadsheet Formulas, Dependencies, and Circular ReferencesMedium

  Implement spreadsheet formulas with dependency updates, repeated references, unset cells, and cycle detection that recovers after formulas change.

  OtherSoftware EngineerCoding & AlgorithmsOther
• Test Severity Filtering with Contract-Distinguishing CasesMedium

  Test severity filtering with independent expected results, inclusive boundaries, misleading message text, missing fields, empty records, and preserved order and duplicates.

  OtherSoftware EngineerSoftware Engineering FundamentalsOnsite
• Track Workers, Sessions, Promotions, and Bonus PayEasy

  Implement worker sessions, current metadata, promotions, ordered filtering, and time-clipped compensation with historical rates and non-stacking double-pay intervals.

  OtherSoftware EngineerCoding & AlgorithmsOnline Assessment
• Validate Nested Parentheses, Brackets, and BracesEasy

  Validate nested parentheses, brackets, and braces with correct handling of empty input, mismatched closing symbols, and unfinished groups.

  OtherSoftware EngineerCoding & AlgorithmsOnline Assessment
• Write SQL to analyze response accuracy and speedMedium

  This question evaluates proficiency with SQL-based data manipulation and analytical querying on relational assessment data, including aggregation, grouping, joins, windowed ranking, and use of PostgreSQL statistical functions to analyze accuracy and response-time metrics.

  OtherData ScientistData Manipulation (SQL/Python)Online Assessment
• Write mini-batch gradient descentMedium

  This question evaluates understanding and implementation of optimization algorithms for machine learning, specifically mini-batch gradient descent, and measures competency in numerical optimization, algorithmic implementation, and training dynamics within the Coding & Algorithms domain for Data Scientist roles.

  OtherData ScientistCoding & AlgorithmsOnsite