practice a little every day, paws crossed ♡

Backend Engineer Interview Questions

Practice 9403 coding, system design and machine learning questions from 546 companies, sorted by role, topic and interview round. Every question has step-by-step hints, a code runner that supports 8 languages and an AI mentor; members also get the full solution walkthrough.

9403
Questions: 546
Companies: 11
Topics: 8
Languages

Showing 1–6 of 6 results

ByteDanceHardBackend Engineer
Backend Fundamentals Deep Dive: MySQL Internals, Redis, and the HTTP/HTTPS Request Lifecycle
This problem tests your depth in database durability mechanisms, caching strategies for consistency, and the network-level steps involved in secure HTTP request handling.
Software Engineering FundamentalsTechnical ScreenMySQLRedisSystem Design
ChimeMediumBackend Engineer
Design browser history across tabs
This question tests the ability to design an efficient data structure for navigating browser history, requiring careful management of back/forward states across multiple independent tabs.
Software Engineering FundamentalsTechnical ScreenData StructuresStacksHash Maps
CrowdstrikeMediumBackend Engineer
Implement a Risk-Score Priority DetectionStore With Put and GetNext in C++
Implement a C++ DetectionStore whose Put stores security detections with an id, an unsigned risk score and a payload, and whose GetNext removes and returns the next detection by risk score as a unique_ptr. Tests priority-structure choice, ownership semantics, tie and duplicate-id policies, and thread safety.
Software Engineering FundamentalsTechnical Screen
NielsenMediumBackend Engineer
Design a Train Ticket Booking System
This problem evaluates your ability to design a robust reservation system that handles concurrent bookings, maintains data integrity, and adheres to clean object-oriented design principles.
Software Engineering FundamentalsTechnical ScreenConcurrencySystem DesignDatabase
RedditMediumBackend Engineer
Design Tennis Scoring with Pluggable Rules
Design a testable tennis game scoring component with point recording, readable scores, terminal-state handling, and stable player identity. Keep standard Deuce and Advantage rules separate from pluggable alternatives such as no-ad scoring, and discuss audit history and serialization.
Software Engineering FundamentalsTechnical Screen
ZipHQMediumBackend Engineer
Find Bugs in an LRU Cache
Identify behavioral bugs in a Java-based LRU Cache implementation using LinkedHashMap, write minimal failing tests, and provide the corrected code.
Software Engineering FundamentalsTechnical Screenjavadata-structuresdebugging