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Roblox Favorites/Bookmark System Design – High-QPS Item Counter & Per-User State

Roblox Roblox Favorites/Bookmark System Design – High-QPS Item Counter & Per-User State

Roblox has a marketplace with millions of items. A user can flag/unflag any item as a favorite (similar to Like/Bookmark).Goal: Design a system that can show the number of favorites each item has. User Stories / QPS targets Extra:– As a user, I want to list all items I have favorited — 50K QPS (Insert…

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Roblox 2025-11-13
Roblox Game Detail Page System Design – Optimize Friend & Player Count Display

Roblox Roblox Game Detail Page System Design – Optimize Friend & Player Count Display

This question focuses on system design and scalability within the context of Roblox’s Game Detail Page.You’re asked to design how to efficiently display: while considering massive user scale (100M total, 10M concurrent). Key challenges include: Typical design solutions might involve: The VOprep team has long accompanied candidates through various major company OAs and VOs, including Roblox, Google,…

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Roblox 2025-11-13
Design a Unified Quota Service – System Design Interview Question (Cloud Storage, Google/Apple/Microsoft Style)

Snowflake Design a Unified Quota Service – System Design Interview Question (Cloud Storage, Google/Apple/Microsoft Style)

Companies like Google, Apple, Microsoft, etc. offer various services such as drive, photos, mail, and documents.Typically, they provide users with a single shared quota. For example, if you purchase a 100GB storage plan,all these services will consume capacity from the same quota bucket. Under the hood, such systems usually look like this: Applications and services…

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Snowflake 2025-11-12
Find Words in a Character Matrix – Snowflake Interview Question Explained

Snowflake Find Words in a Character Matrix – Snowflake Interview Question Explained

Example: Matrix: Words: Output: [‘abe’] This problem asks you to check which of the given words can be found in a 2D character matrix. A valid word must be formed by adjacent characters in the matrix, typically in horizontal or vertical directions (depending on the interviewer’s clarification). The task is essentially a simplified version of…

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Snowflake 2025-11-12
Snowflake Interview Question: Implement a Mini Programming Language Interpreter

Snowflake Snowflake Interview Question: Implement a Mini Programming Language Interpreter

SnowCal is a simple programming language used to perform calculations. A SnowCal program keeps a single integer X in memory, initially set to zero, and repeatedly performs addition and multiplication operations on it. Formally, the language has 5 operations: Write an interpreter that takes in the commands as an array of strings and returns the…

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Snowflake 2025-11-12
Snowflake Interview Question: Determine Which Cake You Receive in a 1D Space Allocation Problem

Snowflake Snowflake Interview Question: Determine Which Cake You Receive in a 1D Space Allocation Problem

Each person wants to eat one cake. People tend to get the cake that is the closest to him/her.However, if he/she finds that this cake already belongs to someone else, the person will give up that cake and look for the next closest cake. The number of cakes is never smaller than the number of…

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Snowflake 2025-11-12
Snowflake Interview Question: Minimum Distance Between Person and Cake in a 1D Array

Snowflake Snowflake Interview Question: Minimum Distance Between Person and Cake in a 1D Array

Given a 1-d space, represented as an int array.Each element in this array can have one of the three values {0, 1, 2} with meanings: The distance between a cake and a person is defined as the number of spaces between them. Please write a method to get the minimum distance between any person and…

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Snowflake 2025-11-12
Snowflake Interview Question: Find Words in a Character Grid (Full Problem Statement + Summary)

Snowflake Snowflake Interview Question: Find Words in a Character Grid (Full Problem Statement + Summary)

Given an m × n array of characters, and a list of strings.Return the subset of the strings that are found in the array. You are given a character grid and a list of candidate words.Your task is to return all words that can be formed by tracing adjacent cells in the grid (typically up,…

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Snowflake 2025-11-12
Oracle Interview Question:Count Occurrences of Terms in a String — Oracle Interview / Text Parsing (No Regex)

Oracle Oracle Interview Question:Count Occurrences of Terms in a String — Oracle Interview / Text Parsing (No Regex)

Problem statement:Given an array of strings (terms) and a target string, find the number of occurrences of each term in the target. You only need to implement the Count method. Parameters / Requirements: Without regex, implement multi-pattern counting. Options: naive sliding checks with indexing by first letter/length, or Aho–Corasick for optimal performance. Count overlapping matches…

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Oracle 2025-11-11
Oracle Interview Question: Fraction to Decimal with Repeating Part (Parenthesized) — Oracle / String / Hash Map

Oracle Oracle Interview Question: Fraction to Decimal with Repeating Part (Parenthesized) — Oracle / String / Hash Map

Given two integers, numerator and denominator, return the decimal representation of the fraction numerator/denominator as a string. Examples Simulate long division. Track each remainder’s first index in the fractional string via a hash map. When a remainder repeats, insert parentheses around the substring from its first occurrence to the end. Handle sign, zero integer part,…

16 Views 0 Comments
Oracle 2025-11-11
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