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Interview Questions
Practice 9403 coding, system design and machine learning questions from 546 companies, sorted by role, topic and interview round. Every question has step-by-step hints, a code runner that supports 8 languages and an AI mentor; members also get the full solution walkthrough.
- 9403
- Questions
- 546
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- 11
- Topics
- 8
- Languages
Showing 7441–7470 of 9403 results
- RobloxHardSoftware EngineerDesign real-time game matchmaking service
This question evaluates a candidate's competence in designing scalable, low-latency distributed systems and matchmaking algorithms, including skills in queue management, skill-based matching, regional sharding, SLO-driven latency targets, consistency models, failure handling, and monitoring.
System DesignOnsite - RobloxHardSoftware EngineerDesign resource loader and ROS-like pub/sub
This question evaluates system design and distributed-systems competencies including resource management, async concurrency, caching and eviction, streaming and partial loads, dependency resolution, failure isolation, observability, and pub/sub concerns such as topic/schema/versioning, discovery, QoS, ordering, replay, partitioning, latency, clock semantics, and security. Commonly asked to assess architectural reasoning about scalability, low-latency trade-offs, fault tolerance, and deployment/topology choices, it is categorized under System Design and tests both high-level conceptual understanding and practical application-level design decisions; English.
System DesignOnsite - RobloxMediumSoftware EngineerDesign robot path boundedness with repeats
This question evaluates algorithmic skills in parsing compressed instruction strings, finite-state simulation, and spatial reasoning to determine path boundedness, and it belongs to the Coding & Algorithms domain.
Coding & AlgorithmsOnsite - RobloxMediumSoftware EngineerDetect robot state after movements
This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Detect robot state after movements states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsOnsite - RobloxMediumSoftware EngineerDetect runs and collapse a numeric grid
This question evaluates proficiency in 2D array manipulation, pattern detection for contiguous runs, and state simulation involving removal and gravity-like collapse of elements.
Coding & AlgorithmsOnsite - RobloxMediumSoftware EngineerDiscovering a Design Flaw Right Before a Project Deadline: How Do You Respond?
A situational behavioral question for software engineers: your project is close to its deadline when you discover that an earlier design decision is flawed. It tests how you size the flaw's impact, weigh delaying against shipping with a mitigation or cutting scope, communicate with the people who own the date, and follow through.
Behavioral & LeadershipTechnical Screen - RobloxMediumData ScientistEvaluate Impact of New Roblox Homepage Tab
Roblox data scientist experimentation prompt on evaluating a new homepage tab, including hypotheses, engagement funnel metrics, guardrails, power, duration, segmentation, cannibalization, and rollout criteria.
Analytics & ExperimentationTechnical Screen - RobloxMediumFrontend EngineerExecutive-Round Behavioral: Proactive Decision-Making in Career and Projects
This question assesses the candidate's ability to demonstrate agency, self-reflection, and proactive decision-making when navigating complex professional transitions and high-stakes technical trade-offs.
Behavioral & LeadershipOnsiteBehavioralLeadershipDecision-Making - RobloxEasyMachine Learning EngineerExtend counter to per-client rate limiting
This question evaluates competency in designing per-client, time-windowed rate limiting using efficient data structures for time-based eviction and counting within the Coding & Algorithms domain.
Coding & AlgorithmsTechnical Screen - RobloxMediumMachine Learning EngineerFind Windows Containing a Target
This problem tests your ability to efficiently filter and identify intervals within a collection that satisfy specific containment constraints using two-pointer or sliding window techniques.
Coding & AlgorithmsOnsiteArraysFilteringIntervals - RobloxMediumSoftware EngineerFind largest digit-sum bucket size
This question evaluates a candidate's competency in combinatorial counting, digit-sum properties, and algorithmic optimization for range queries within the Coding & Algorithms domain.
Coding & AlgorithmsTechnical Screen - RobloxEasyData ScientistFind maximum follow depth using recursion
This question evaluates a candidate's competency with recursion, directed graph traversal, cycle detection, and memoization when computing longest-path depths in social-network-style follow graphs.
Coding & AlgorithmsTechnical Screen - RobloxMediumSoftware EngineerFind most frequent call path in logs
This problem tests your ability to parse structured log strings representing nested function calls into a hierarchical tree and identify the most frequently occurring execution path.
Coding & AlgorithmsTechnical ScreenStackHash MapString Manipulation - RobloxMediumMachine Learning EngineerFind target-heavy sliding windows
This question tests the ability to implement an efficient sliding window algorithm to analyze frequency-based patterns within a data stream or array.
Coding & AlgorithmsOnsiteSliding WindowAlgorithmsArray - RobloxMediumSoftware EngineerFind the Longest Safe Straight-Line Movement on a Laser Grid
Find a robot's longest safe straight-line movement on a laser-covered grid, where only the initial cell is protected and laser rows and columns are blocked.
Coding & AlgorithmsOnline Assessment - RobloxEasyMachine Learning EngineerFind the Most Frequent Log Call
This question evaluates a candidate's ability to perform frequency analysis on sequences, demonstrating competency with data structures for counting occurrences and with algorithmic time and space complexity considerations.
Coding & AlgorithmsTechnical Screen - RobloxHardData ScientistFit logistic regression and return top features
This question evaluates understanding of binary logistic regression, coefficient-based feature importance, and practical model-fitting considerations such as intercept inclusion and input shape handling.
Machine LearningOnline Assessment - RobloxMediumData ScientistGenerate Friendship List with Acceptance Dates Using Pandas
This question evaluates proficiency in data manipulation and relational reasoning using Python/pandas, focusing on transforming event logs into canonical pairwise relationships and extracting activation timestamps.
Data Manipulation (SQL/Python)Onsite - RobloxMediumSoftware EngineerHandle Difficult Feedback and Manager Disagreement
Tests emotional intelligence, professional maturity, constructive disagreement, and the ability to accept critical feedback and commit to collective team decisions.
Behavioral & LeadershipTechnical Screenbehavioralleadershipconflict-resolution - RobloxMediumSoftware EngineerHandle Release Risks and Cross-Team Blockers
Assess a candidate's ability to navigate high-stakes release deadlines when facing upstream dependencies, critical bugs, and cross-team roadblocks.
Behavioral & LeadershipOnline AssessmentBehavioralRelease ManagementCross-Team Collaboration - RobloxMediumData ScientistImplement Python Function for Statistical Test P-Values
This question evaluates proficiency in statistical hypothesis testing, p-value interpretation, and implementing distribution-based calculations (Z and Student-t) in code, and it falls under the Coding & Algorithms domain for data scientist roles.
Coding & AlgorithmsTechnical Screen - RobloxMediumSoftware EngineerImplement Sliding-Window Rate Limiter
This problem tests your ability to implement a thread-safe rate limiter using a sliding window algorithm to ensure a user does not exceed a fixed number of requests within a rolling time frame.
Coding & AlgorithmsTechnical ScreenAlgorithmsData StructuresRate Limiting - RobloxMediumSoftware EngineerImplement a Log Rate Limiter
This problem tests your ability to design a thread-safe, time-windowed rate limiter using efficient data structures to track event timestamps.
Coding & AlgorithmsOnsiteHash TableDesignConcurrency - RobloxMediumSoftware EngineerImplement a Rolling-Window Rate Limiter
Implement an in-memory, rolling-window rate limiter supporting per-client limits, precise boundary expiration, and stale state cleanup.
Software Engineering FundamentalsTechnical ScreenData StructuresQueueSystem Design - RobloxMediumSoftware EngineerImplement a sliding-window rate limiter
Evaluates the candidate's ability to design and implement an in-memory sliding-window rate limiter enforcing per-user and per-game constraints, focusing on correct request-acceptance semantics and efficient timestamp eviction; Category/domain: Coding & Algorithms; Level of abstraction: component-level algorithm and data-structure implementation.
Coding & AlgorithmsOnsite - RobloxEasyData ScientistImplement four DS coding tasks
This multi-part question evaluates a data scientist's competencies in statistical inference (sample size and z-test calculations), causal inference and parallel-trends validation (difference-in-differences), Bayesian probability updating, and interpretable supervised learning feature importance, all framed as coding tasks.
Coding & AlgorithmsOnline Assessment - RobloxMediumSoftware EngineerImplement queue-based rate limiter with multi-key limits
This question evaluates implementation and design skills around rate limiting, including rolling-window counters, multi-key constraints, and atomic updates, and falls under the Coding & Algorithms domain focused on practical application of algorithms and data structures.
Coding & AlgorithmsOnsite - RobloxEasyMachine Learning EngineerImplement recent-requests counter
This question evaluates a candidate's ability to design efficient in-memory data structures and manage time-windowed event counting, testing algorithmic reasoning and performance optimization for high-throughput services.
Coding & AlgorithmsTechnical Screen - RobloxHardData ScientistImplement robust one/two-sided p-value function
This question evaluates proficiency in statistical hypothesis testing, numerical computing, and numerical stability when implementing p-value calculations for z and t distributions, and it targets the Statistics & Math domain for a data scientist role.
Statistics & MathTechnical Screen - RobloxMediumData ScientistImplement streaming CTR with deduplication
This question evaluates streaming data-processing and algorithmic design skills, specifically time-windowed aggregation, click deduplication, late-event handling, state management, and selection of data structures for per-campaign CTR computation.
Coding & AlgorithmsTechnical Screen
Roblox