Roblox Interview Questions
Practice 89 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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Design game matchmaking and waiting queue
Design a scalable game matchmaking and waiting-queue system You are designing the matchmaking system for a large real-time multiplayer game (think of ...
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 a Log Rate Limiter
You are building a backend logging service. Implement a class that decides whether an incoming log message should be emitted. Each request provides: -...
Design a Static Audio Detection System
System Design: Static Audio Detection Pipeline Context Design an offline (non-live) audio detection system that processes static audio files (e.g., us...
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...
Find Windows Containing a Target
You are given a list of windows, where each window is represented as an inclusive integer interval [start, end], and an integer target. Return all win...
Design a scheduled payment system
System Design: Scheduled Payment Service Context You are designing a backend service that allows end users to: - Schedule a payment for a future date/...
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...
Implement a sliding-window rate limiter
Implement an in-memory sliding-window rate limiter. You are given a stream of requests, each with a timestamp in milliseconds. Part 1: Per-user limit ...
Find largest digit-sum bucket size
You are given two integers low and high (inclusive). Define s(x) as the sum of the decimal digits of x. For every integer x in [low, high], place x in...
Extend counter to per-client rate limiting
You are extending the recent-requests counter to support per-client rate limiting. Each request now includes a clientId identifying the caller. You mu...
Implement streaming CTR with deduplication
Implement a Python function to compute streaming, per-campaign CTR over a sliding 24-hour window with click de-duplication and late-arriving events. R...
Simulate robot path and detect boundedness
A robot starts at (0, 0) facing north on an infinite 2D plane. It executes a command string s consisting of 'G' (move forward one unit), 'L' (turn lef...
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 ...
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'...
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:...
Apply Bayes' rule to compute posterior
A binary event \(A\) (e.g., “user is a payer” or “patient has a disease”) has prior probability \(P(A)\). You observe evidence \(B\) (e.g., a model pr...
Describe feedback, conflict, and missed metrics
Question This Roblox software engineer onsite behavioral round covers three related leadership scenarios. Be ready to answer each with a concrete, str...
Compute sample size and Bayes posterior
You are implementing two small statistical utilities. Part A — Power / sample size (two-sample z-test) - Input: - x: a 1D numeric array of historica...
Derive variance and CTR confidence intervals
CTR as a Proportion: Estimation, Confidence Intervals, and Day-Level Variability Context: Click-through rate (CTR) is a proportion metric defined as C...