Software Engineer Interview Questions
Practice the exact questions companies are asking right now.
Convert stack samples to trace events
Question Implement convertToTrace(samples) that, given a chronologically ordered vector of stack samples (each sample contains a timestamp and a call-...
Implement in-memory DB querying
Question Implement an in-memory database that supports: 1. Querying the whole table and returning only selected columns (projection). 2. Adding WHERE ...
Evaluate actions in Amazon simulation
Amazon Work Simulation: Purpose, Modules, and Design Decisions Context and Assumptions The Work Simulation is a timed, scenario-based assessment used ...
Detect shuffle-mode sequence
Question Given a playlist of distinct songs and two player modes—Random (each next song chosen independently and uniformly at random, with replacement...
Implement matrix-indexing and expression resolver
Question Given a text file path whose contents include a single block starting with a line like "[2,4]" followed by rows of equal-length characters (e...
Calculate area, flush probability, egg drops
Question Given two quarter-circles inside a 1×1 square (centers at bottom-left and top-right corners), find the exact area of their overlapping region...
Design account system with cashback
System Design: Account Management with Transfers, Payments, and Cashback You are to design and implement an in-memory account management service that ...
Solve string merge and grid path tasks
Question Given two equal-length strings s1 and s2, create a new string by iterating i = 0 … n-1, comparing s1[i] with s2[n-1-i]: append s1[i]; if the ...
Compute minimum passes to collect numbers
Question You are given an array shelf of n distinct integers that is a permutation of 1…n. Starting with target = 1, you repeatedly scan shelf from le...
Allocate refund across payments
Question Given a list of completed payment transactions (each with payment method, date, and amount) and a refund amount R, write an algorithm that is...
Compute minimum passes over permutation
Question You are given an array shelf representing a permutation of the integers 1..n. Starting with target = 1, you repeatedly scan the array left-to...
Find exit URL via BFS API calls
Question Design and implement a function that, given a starting URL "/", performs BFS or DFS by repeatedly sending HTTP GET requests of the form GET "...
Process auth requests with fraud rules
Question Implement a function that, given a list of Authorization Requests (timestamp_seconds, unique_id, amount, card_number, merchant), outputs a hu...
Design cloud storage system
In-Memory Cloud Storage: Design and Implement You are asked to design and implement an in-memory cloud storage system that maintains a mapping from fi...
Solve island and frequency problems
Question LeetCode 200. Number of Islands – given a 2D grid, count the number of connected islands of '1's using DFS/BFS/Union-Find. LeetCode 695. Max ...
Count uniques in sparse sorted array
Question A sorted array contains many duplicates but only a very small number of distinct values. Design an algorithm that counts how many unique numb...
Parse strings and find meeting slots
Question Given a text file where each line contains raw information, extract the user identifier and the numeric quantity on that line and store the r...
Show Behavioral Fit and Experience
Behavioral and Leadership HR Screen — Software Engineer (Netflix) Context: This is an HR screen focused on your background, leadership, and culture fi...
Find most frequent log user
Question You are given a list of log entries in string format, where each entry contains a username and an access timestamp separated by a delimiter (...
Design log-query stream processor
Stream Processor: Query Registration and Log Tagging Context You are designing a streaming component that ingests a single mixed stream of messages. E...