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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Rank features using logistic regression coefficients
This question evaluates understanding of feature scaling, interpretation of logistic regression coefficients as feature importance, and awareness of h...
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...
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 ...
Implement queue-based rate limiter with multi-key limits
Implement a rate limiter with method allow(timestamp) that returns true if a request is allowed under a limit of K requests per rolling window W milli...
Define success metrics and monitoring
Define success metrics and monitoring Design success metrics, evaluation, and monitoring for an audio detection system Context You are defining the me...
Evaluate Impact of New Roblox Homepage Tab
Evaluate the Impact of a New Roblox Homepage Tab Roblox plans to replace an existing homepage tab with a new one. The team needs to measure whether th...
Find maximum follow depth using recursion
You are given a directed follows relationship representing a social graph: - Each record (follower_id, followee_id) means follower_id follows followee...
Implement Sliding-Window Rate Limiter
This question evaluates understanding of time-based sliding-window rate limiting, per-user quota enforcement, efficient in-memory data structures for ...
Find target-heavy sliding windows
This question evaluates array manipulation, counting and efficient algorithm design—focusing on the sliding-window technique for detecting and quantif...
Implement a Log Rate Limiter
This question evaluates a candidate's ability to design and implement time-based rate limiting and stateful event tracking using appropriate data stru...
Detect runs and collapse a numeric grid
You are given an m x n grid of digits (0– 9). Phase 1: Find every horizontal or vertical run of length ≥ 3 consisting of the same digit. For each run,...
Determine Player Preference for Local Game Creators
Player Preference for Local Game Creators A Roblox analytics team wants to understand whether players prefer games created by local creators, such as ...
Implement recent-requests counter
You are designing an in-memory component for a web service that needs to track how many requests ("hits") it has received in the last 5 minutes. Imple...
Match requests and accepts into friendships in SQL
Given two event tables, write a single SQL query (PostgreSQL) to output unique undirected friendships with the earliest valid friendship_date. Schema ...
Implement deduped CTR/RPM aggregator over event stream
Implement a Python function to compute per-day, per-campaign CTR and RPM from an event stream with possible out-of-order and duplicate click events. I...
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...
Compute diff-in-diff and pretrend flag
This question evaluates understanding of difference-in-differences estimation, simple pretrend detection, and related data-processing competencies for...
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...
Find most frequent call stack from logs
Given an array of log entries for a single-threaded program's function calls, each entry is either '->Name' (function entry) or '<-Name' (function exi...
Randomly partition array into k segments
Question Given a list of integers and an integer k representing the number of segments, write a function that randomly partitions the list into k non-...