Roblox interview questions

Showing 31–60 of 84 results

• Design a rate limiterMedium

  This problem tests your ability to design a distributed rate-limiting service that maintains request counts across multiple application nodes while balancing system performance and accuracy.

  RobloxSoftware EngineerSystem DesignTechnical Screen
• Design a real-time game recommendation systemHard

  Design a real-time game recommendation system evaluates ML product requirements, data/labeling, modeling, serving architecture, evaluation, monitoring, and trade-offs in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  RobloxMachine Learning EngineerML System DesignTechnical Screen
• Design a scheduled payment systemHard

  This question evaluates proficiency in designing a reliable, scalable scheduled payment service, testing competencies in distributed systems, API design, scheduling and execution workflows, idempotency and deduplication, time semantics, transactional consistency, security and compliance, and operational monitoring.

  RobloxSoftware EngineerSystem DesignOnsite
• Design an In-App Notification Center with Real-Time Updates and Unread CountsMedium

  A system design question about an in-app notification center that turns product events into per-user notifications, shows an unread badge and a recent list, and pushes new items to online users. It tests fan-out strategy, inbox data modeling, unread counts, real-time delivery, reliability, and client design.

  RobloxSoftware EngineerSystem DesignOnsite
• Design experiment for homepage tab replacementHard

  This question evaluates experiment design and causal-inference competency for product changes that impact both end users and platform creators, covering randomization strategies, metric and guardrail selection, power calculations, and handling of novelty, navigation friction, and ecosystem interference.

  RobloxData ScientistAnalytics & ExperimentationTechnical Screen
• Design favorites and social game recommendationsMedium

  This question tests the ability to design a scalable, low-latency system for managing user-specific lists (favorites) and integrating real-time social signals into a game recommendation engine.

  RobloxSoftware EngineerSystem DesignOnsite
• Design in-game payment wallet systemMedium

  Design in-game payment wallet system evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  RobloxSoftware EngineerSystem DesignTechnical Screen
• Design leakage-free predictive maintenance pipelineHard

  This question evaluates a data scientist's competency in designing time-series predictive maintenance pipelines, focusing on temporal feature engineering, leakage prevention and point-in-time joins, handling late-arriving labels, class imbalance and cost-sensitive thresholding, probabilistic calibration, explainability, and operational drift monitoring. It is commonly asked in the Machine Learning domain to assess an applicant's ability to produce an end-to-end, production-ready workflow that balances practical implementation concerns with conceptual system-design reasoning, so the task is primarily practical application with important conceptual elements.

  RobloxData ScientistMachine LearningOnline Assessment
• Design real-time game matchmaking serviceHard

  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.

  RobloxSoftware EngineerSystem DesignOnsite
• Design resource loader and ROS-like pub/subHard

  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.

  RobloxSoftware EngineerSystem DesignOnsite
• Design robot path boundedness with repeatsMedium

  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.

  RobloxSoftware EngineerCoding & AlgorithmsOnsite
• Detect robot state after movementsMedium

  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.

  RobloxSoftware EngineerCoding & AlgorithmsOnsite
• Detect runs and collapse a numeric gridMedium

  This question evaluates proficiency in 2D array manipulation, pattern detection for contiguous runs, and state simulation involving removal and gravity-like collapse of elements.

  RobloxSoftware EngineerCoding & AlgorithmsOnsite
• Discovering a Design Flaw Right Before a Project Deadline: How Do You Respond?Medium

  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.

  RobloxSoftware EngineerBehavioral & LeadershipTechnical Screen
• Evaluate Impact of New Roblox Homepage TabMedium

  Roblox data scientist experimentation prompt on evaluating a new homepage tab, including hypotheses, engagement funnel metrics, guardrails, power, duration, segmentation, cannibalization, and rollout criteria.

  RobloxData ScientistAnalytics & ExperimentationTechnical Screen
• Executive-Round Behavioral: Proactive Decision-Making in Career and ProjectsMedium

  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.

  RobloxFrontend EngineerBehavioral & LeadershipOnsite
• Extend counter to per-client rate limitingEasy

  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.

  RobloxMachine Learning EngineerCoding & AlgorithmsTechnical Screen
• Find Windows Containing a TargetMedium

  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.

  RobloxMachine Learning EngineerCoding & AlgorithmsOnsite
• Find largest digit-sum bucket sizeMedium

  This question evaluates a candidate's competency in combinatorial counting, digit-sum properties, and algorithmic optimization for range queries within the Coding & Algorithms domain.

  RobloxSoftware EngineerCoding & AlgorithmsTechnical Screen
• Find maximum follow depth using recursionEasy

  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.

  RobloxData ScientistCoding & AlgorithmsTechnical Screen
• Find most frequent call path in logsMedium

  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.

  RobloxSoftware EngineerCoding & AlgorithmsTechnical Screen
• Find target-heavy sliding windowsMedium

  This question tests the ability to implement an efficient sliding window algorithm to analyze frequency-based patterns within a data stream or array.

  RobloxMachine Learning EngineerCoding & AlgorithmsOnsite
• Find the Longest Safe Straight-Line Movement on a Laser GridMedium

  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.

  RobloxSoftware EngineerCoding & AlgorithmsOnline Assessment
• Find the Most Frequent Log CallEasy

  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.

  RobloxMachine Learning EngineerCoding & AlgorithmsTechnical Screen
• Fit logistic regression and return top featuresHard

  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.

  RobloxData ScientistMachine LearningOnline Assessment
• Generate Friendship List with Acceptance Dates Using PandasMedium

  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.

  RobloxData ScientistData Manipulation (SQL/Python)Onsite
• Handle Difficult Feedback and Manager DisagreementMedium

  Tests emotional intelligence, professional maturity, constructive disagreement, and the ability to accept critical feedback and commit to collective team decisions.

  RobloxSoftware EngineerBehavioral & LeadershipTechnical Screen
• Handle Release Risks and Cross-Team BlockersMedium

  Assess a candidate's ability to navigate high-stakes release deadlines when facing upstream dependencies, critical bugs, and cross-team roadblocks.

  RobloxSoftware EngineerBehavioral & LeadershipOnline Assessment
• Implement Python Function for Statistical Test P-ValuesMedium

  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.

  RobloxData ScientistCoding & AlgorithmsTechnical Screen
• Implement Sliding-Window Rate LimiterMedium

  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.

  RobloxSoftware EngineerCoding & AlgorithmsTechnical Screen