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Interview questions by company and topic | SysRound

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155 questions

Showing 1–25

Practical engineeringDifficulty not specified
Extend a Full-Stack HR System to Support Scheduling Future Employee Status Changes
Extend a full-stack HR codebase to support scheduling a change to employee status. Implement the necessary frontend and backend changes to allow users to set…
Companies: Rippling
Last reported Nov 2026
Open workspace
Practical engineeringDifficulty not specified
Card Game: Find Three Cards Summing to 15
Fix a failing test case for invalid move validation in a card game, then implement a strategy to repeatedly find sets of 3 cards that…
Companies: Meta
Last reported Nov 2026
Open workspace
Practical engineeringDifficulty not specified
Dasher Picker Using HashMap

Page 1 of 7

Implement a system to maintain a list of dashers using a hash map data structure with functionality for random selection of dashers.

Companies: DoorDash

Last reported Nov 2026

Practical engineeringDifficulty not specified

Maximize Unique Characters from Word List

Given a list of words, find a subset that maximizes the total number of unique characters used, ensuring no character appears more than once across…

Companies: Meta

Last reported Nov 2026

Practical engineeringDifficulty not specified

Online Food Order Assignment System

Implement and debug an online food ordering system with classes for orders, kitchens, chefs, and dishes. Fix a bug in the order completion check and…

Companies: Meta

Last reported Nov 2026

Practical engineeringDifficulty not specified

Poker Card Game

Implement a poker card game that models standard gameplay mechanics. The solution should handle deck management, hand evaluation, and determine winners based on poker hand…

Companies: Rippling

Last reported Nov 2026

Practical engineeringDifficulty not specified

Banking System PIN Validation

Implement a card PIN validation system that performs numeric checks and length checks (rejecting non-numeric characters). Completed on the HackerRank platform with Agent Mode…

Companies: Atlassian

Last reported Oct 2026

Practical engineeringDifficulty not specified

LRU Cache Service

Design and implement a production-ready LRU Cache service with authentication, rate limiting, and deployment considerations. The solution should handle concurrent HTTP requests…

Companies: Microsoft, Shopify

Last reported Oct 2026

Practical engineeringHard

Rectangle grid with IDs: coverage counts, replace and delete, O(1) queries, batch undo

Companies: OpenAI

Data Structure Design

Last reported Oct 2026

Practical engineeringHard

Same-Hostname Web Crawler: Single-Threaded, Then Multithreaded

Companies: Anthropic

Concurrency · Graphs

Last reported Oct 2026

Practical engineeringDifficulty not specified

Complete a Multi-File Key Encryption and Decryption Implementation Using AI-Assisted Coding

Given a large, multi-file project involving key encryption and decryption, use AI-assisted coding to complete missing implementations and get the provided tests passing. Be…

Companies: Palo Alto Networks

Last reported Oct 2026

Practical engineeringDifficulty not specified

Firewall Rule Engine: Debugging and Refactoring

Debug and refactor an existing firewall application to correctly enforce a set of firewall rules. Identify and fix bugs, improve code structure, and write additional…

Companies: Palo Alto Networks

Last reported Oct 2026

Practical engineeringDifficulty not specified

Token Rate Limiter: Debugging and Testing

Debug and fix a broken token-based rate limiter, then analyze a proposed code change that passes existing tests but introduces a regression, and write a…

Companies: Palo Alto Networks

Last reported Oct 2026

Practical engineeringHard

Two-Player Three-Card Poker Simulation: Deal Hands and Decide the Winner

Companies: OpenAI

Simulation & State Machines

Last reported Oct 2026

Practical engineeringHard

Chat event aggregator: sliding-window message counts and active chats per user

Companies: OpenAI

Data Structure Design · Stacks & Queues

Last reported Oct 2026

Practical engineeringHard

Code a poker game: model cards, rank five-card hands and pick the winners

Companies: OpenAI

Low-Level Design (OOP)

Last reported Oct 2026

Practical engineeringHard

Card Game Program: Rank Three-Card Hands and Print the Winner

Companies: OpenAI

Low-Level Design (OOP) · Sorting

Last reported Oct 2026

Practical engineeringHard

Fault-Tolerant Task Queue with Retries, a Dead-Letter Queue and Task Dependencies

Companies: OpenAI

Data Structure Design · Graphs

Last reported Oct 2026

Practical engineeringHard

Implement a GPU credit ledger: grant credits, charge usage, report the balance

Companies: OpenAI

Data Structure Design

Last reported Oct 2026

Practical engineeringHard

Rectangle board: add rectangles, count those covering a point, and undo

Companies: OpenAI

Data Structure Design

Last reported Oct 2026

Practical engineeringMedium

Fair Coin from a Biased Coin, Uniform 1-to-n Sampler Bug, Monte Carlo with Threads

Companies: Anthropic

Math & Number Theory · Probability

Last reported Oct 2026

Practical engineeringMedium

Sliding-Window Chat Analytics: Recent Counts, Live Sessions, Out-of-Order Events

Companies: OpenAI

Data Structure Design · Stacks & Queues

Last reported Oct 2026

Practical engineeringHard

Fault-Tolerant Task Queue with Retry Cooldowns, a Dead-Letter Queue and Dependencies

Companies: OpenAI

Data Structure Design · Graphs

Last reported Oct 2026

Practical engineeringMedium

Social Graph with Follow/Unfollow, Snapshots, History Queries and Recommendations

Companies: OpenAI

Data Structure Design · Graphs

Last reported Oct 2026

Practical engineeringMedium

Build a Resize-and-Rotate Image Pipeline with Multiprocessing

Companies: Anthropic

Concurrency · File & Media Storage

Last reported Oct 2026