Roblox Interview Questions
Practice 98 real Roblox interview questions for 2026 — real Roblox interview questions drawn from actual interviews with detailed solutions to power your interview preparation. This collection centers on coding and system-design challenges first (data structures, algorithms, scalable social systems and real-time services), then analytics, experimentation, SQL/Python data work, and behavioral leadership prompts. Expect multi-stage loops that mix timed coding screens, architecture/design interviews, product-analytics cases, SQL exercises, and STAR-style behavioral rounds. What’s evaluated: problem-solving speed, production-minded design tradeoffs, experiment rigor, and clear storytelling about impact. For Software Engineers, recurring themes include scalable social features (likes, counters, favorites), rate-limiting patterns (sliding-window and log-rate limiters), real-time matchmaking and recommendation architectures, and log-processing/ranking problems. Data Scientists face causal-inference and experimentation questions (DiD, sample-size and posterior/Bayes calculations), applied modeling and feature ranking (logistic regression, normalization), SQL analytics for follower/influence metrics, and algorithmic coding tasks. Machine Learning Engineers see streaming counters, per-client rate extensions, logging telemetry, and real-time recommendation design. Prep by practicing medium-to-hard coding problems, system-design sketches, A/B testing math, end-to-end SQL + Python analytics, and concise STAR stories.
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Fit logistic regression and return top features
You are given: - X: a 2D numeric array where each row is a feature and each column is an observation (shape: n_features x n_samples). - feature_names:...
Compute GSP vs VCG payments with reserves
Sponsored Search Auction with Quality Scores and Reserve You are analyzing a single-query auction with 2 ad slots. Position CTR multipliers are [0.10,...
Normalize features and rank logistic coefficients
You are given a binary classification training dataset: - X: a 2D array of shape (n_samples, n_features) containing numeric features. - feature_names:...
Compute DiD and validate parallel trends
You are given observational/experiment-like panel data as three equal-length arrays: - period[i]: an integer time period label for observation i (e.g....
Explain an ML project end-to-end with tradeoffs
Pick one of your production ML projects and walk through it end-to-end. Be specific: 1) Problem framing (prediction vs causal decisioning), target def...
Derive variance and CTR confidence intervals
This question evaluates understanding of estimation and inference for proportions, including CTR point estimation, standard errors, multiple confidenc...
Design real-time payments fraud model under constraints
Real-Time ML Policy Design: Prevent Unauthorized Purchases by Minors Context: You need to reduce unauthorized purchases by minors using their parents'...
Design the manual review workflow
Design the manual review workflow System Design: Human-in-the-Loop Review Subsystem Context You are designing a human-in-the-loop (HITL) review subsys...
Design a Scalable Like Counter
This question evaluates a candidate's competence in large-scale system design, covering scalability, high-throughput write handling, read-optimized co...
Defend a metric choice under scrutiny
Describe a time you chose a non-obvious primary metric (e.g., time-per-session over total time) and were challenged by a senior stakeholder. 1) How di...
Design leakage-free predictive maintenance pipeline
Predict 24-hour Machine Faults from an Hourly Panel (End-to-End Design) Context You are given a machine–hour panel: one row per machine per hour with ...
Evaluate friend-interaction feature with network interference
Experiment Design: Network-Aware Test for a "Friend Interaction Boost" in Feed Ranking Context You plan to ship a ranking change that boosts items in ...
Design a real-time game recommendation system
Design a real-time game recommendation system System Design: Real‑Time Game Recommendation System (Architecture Focus) You are designing a real‑time r...
Outline the ML inference and labeling pipeline
Outline the ML inference and labeling pipeline Audio Detection System: ML Inference and Data Pipeline (Model Architecture Out of Scope) Context and As...
Implement robust one/two-sided p-value function
Implement p_value(stat, alternative, dist, df=None) Context: You're building a small, production-quality helper to compute p-values for common one- an...
Design experiment for homepage tab replacement
Experiment Design: Replacing a Homepage Tab and Measuring User + Ecosystem Impact Assume today is 2025-09-01. Roblox plans to replace an existing home...
Find Windows Containing a Target
This question evaluates array traversal and interval-containment reasoning, including handling inclusive endpoints, overlapping intervals, and preserv...
Track Highest-Earning Experience
You are building a core component for a real-time analytics system that tracks the profitability of experiences on a large online platform. Implement ...
Describe leading an ambiguous ads project
Behavioral: End-to-End Ownership Under Ambiguity (Ads/Growth Analytics) Context You are interviewing for a data scientist role focused on ads or growt...
Compute A/B test sample size and Bayes posterior
This question evaluates understanding of statistical power and sample size calculation for a two-sided A/B z-test as well as basic Bayesian posterior ...