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Software 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.
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Showing 5821–5850 of 5874 results
- eBayMediumSoftware EngineerDesign a Top-K trending service
This problem evaluates your ability to design a distributed system that aggregates high-velocity event streams to identify the most frequent items within a sliding time window.
System DesignTechnical ScreenDistributed SystemsScalabilityStreaming - eBayMediumSoftware EngineerDesign an Ad Assignment API
This question evaluates a candidate's skill in designing stateful, production-grade HTTP APIs and reasoning about distributed-systems concerns such as idempotency, concurrency control, per-user state management, and observability.
System DesignTechnical Screen - eBayHardSoftware EngineerDesign an online marketplace for buying and selling
This question evaluates competency in large-scale system design, covering distributed systems, data modeling, scalability, consistency, security, payments and escrow, media handling, and operational concerns for a two-sided online marketplace.
System DesignOnsite - eBayHardSoftware EngineerDetermine Reachability for a Chinese-Chess Horse with Blocked Legs
Determine if a Chinese-chess horse can reach a target coordinate on a 10x9 board while respecting obstacle-blocked destinations and 'hobbled leg' movement constraints.
Coding & AlgorithmsTechnical Screenbfsgraphmatrix - eBayMediumSoftware EngineerDetermine Whether a String Is a Valid Number
Implement a strict numeric string validator that checks whether an ASCII string conforms to valid integer, decimal, and scientific notation formats.
Coding & AlgorithmsTechnical ScreenStringFinite AutomataParsing - eBayMediumSoftware EngineerExplain React Rendering and How You Fixed a Re-render Problem
A frontend experience discussion about React rendering: explain what triggers a render, the render and commit phases, reconciliation and keys, then walk through a rendering performance problem you diagnosed and fixed. It tests accurate React mechanics, measurement-driven optimization and clear communication of past work.
Software Engineering FundamentalsTechnical Screen - eBayMediumSoftware EngineerExplain Why You Are Leaving Your Current Role
This question assesses the candidate's ability to communicate professional motivations, growth mindset, and alignment with a new company without speaking negatively about previous experiences.
Behavioral & LeadershipOnsiteBehavioralCareer GrowthCommunication - eBayMediumSoftware EngineerExplain Why You Want to Join This Company
This question tests your ability to articulate a clear, value-driven motivation for joining the organization, moving beyond surface-level enthusiasm to demonstrate alignment with the company's technical scale and business model.
Behavioral & LeadershipOnsiteBehavioralMotivationCulture Fit - eBayMediumSoftware EngineerFind K most frequent elements
This question tests the ability to combine frequency maps with selection algorithms or heap-based structures to efficiently identify top-k elements.
Coding & AlgorithmsTechnical ScreenHash MapHeapBucket Sort - eBayMediumSoftware EngineerFind the Container with the Most Water
This problem tests your ability to optimize an O(n^2) brute-force approach into an O(n) two-pointer solution by leveraging geometric constraints.
Coding & AlgorithmsOnsiteArraysTwo PointersGreedy - eBayMediumSoftware EngineerFind the Longest Palindromic Substring
Implement an algorithm to find the longest palindromic substring in a given string, breaking ties by selecting the earliest occurrence and properly handling empty inputs.
Coding & AlgorithmsTechnical Screenstringstwo-pointersdynamic-programming - eBayHardSoftware EngineerFind top co-viewed products
This question evaluates algorithmic problem-solving and implementation skills in the Coding & Algorithms domain, including frequency aggregation, ordering with tie-breakers, and efficient data-structure use for session-based recommendation counting.
Coding & AlgorithmsOnsite - eBayMediumSoftware EngineerImplement an In-Memory File System
This problem tests proficiency with hierarchical data structures (trees/tries) and object-oriented design by requiring the implementation of an in-memory file system with file/directory management and path resolution.
Coding & AlgorithmsOnline AssessmentTreesTrieDesign - eBayMediumSoftware EngineerImplement list and grid transformation tasks
This problem tests your ability to simulate state-dependent transitions on a 2D grid and your skill in repartitioning data based on specific grouping constraints.
Coding & AlgorithmsTechnical ScreenArraysSimulationSorting - eBayMediumSoftware EngineerInvesting in Deliberate Professional Growth
This question assesses a candidate's ability to self-identify professional skill gaps, design a structured learning plan, and quantify their growth through feedback.
Behavioral & LeadershipOnsiteGrowth MindsetSelf-ReflectionProfessional Development - eBayEasySoftware EngineerLength of the Longest Contiguous Subarray Summing to a Target
Given an integer array that may contain negative numbers and a target k, return the length of the longest contiguous subarray whose sum equals k, or 0 when none exists. Tests reasoning about subarray sums with mixed signs and handling large inputs efficiently.
Coding & AlgorithmsTechnical Screen - eBayMediumSoftware EngineerPass functions and analyze basic data structures
This question evaluates proficiency with higher-order functions, passing functions or delegates, closures, and reasoning about side effects, alongside the ability to analyze fundamental data structures and their performance characteristics.
Coding & AlgorithmsOnsite - eBayMediumSoftware EngineerRebuild a Binary Tree from Two Traversals and Serialize It Level by Level
Given the preorder and inorder traversals of a binary tree with distinct values, rebuild the tree and return its level-order serialization, with empty slots marked as None and trailing ones removed. It tests understanding of traversal orders, careful index bookkeeping and an efficient solution for trees with thousands of nodes, including fully skewed ones.
Coding & AlgorithmsTechnical Screen - eBayMediumSoftware EngineerResolving a Technical Conflict with a Colleague
This question assesses a candidate's ability to navigate technical disagreements through objective analysis, collaborative communication, and post-decision reflection.
Behavioral & LeadershipOnsiteBehavioralConflict ResolutionCollaboration - eBayMediumSoftware EngineerReturn the K Smallest Values from Sorted Arrays
Tests ability to efficiently merge multiple sorted streams to extract the k smallest elements using a min-heap or frontier-based approach. Evaluates handling of empty arrays, duplicates, and computational complexity dependent on the number of arrays rather than total elements.
Coding & AlgorithmsTechnical ScreenHeapPriority QueueMerge Sort - eBayMediumSoftware EngineerSearch a Rotated Sorted Array in One Binary-Search Pass
Implement a single-pass binary search to locate a target value in a rotated strictly increasing array in logarithmic time and constant auxiliary space.
Coding & AlgorithmsTechnical Screenbinary-searcharraysdivide-and-conquer - eBayMediumSoftware EngineerSolve Dependency, Prefix, and Cache Problems
This set of problems evaluates graph algorithms for dependency and cycle detection, efficient data structure design for prefix-based word storage, and cache eviction policy implementation, assessing skills in algorithmic analysis, data structures, and time/space complexity within the Coding & Algorithms domain.
Coding & AlgorithmsOnsite - eBayMediumSoftware EngineerWildcard Dictionary Matching
This problem tests your ability to implement a pattern-matching algorithm that supports variable-length wildcards using recursion with memoization or dynamic programming.
Coding & AlgorithmsTechnical ScreenRecursionDynamic ProgrammingString Matching - xAIHardSoftware EngineerAnswer technical-challenge and motivation questions
This question evaluates technical problem-solving depth, communication of impact, leadership and ownership, and intrinsic motivation and cultural fit by probing a candidate's most challenging engineering work and reasons for joining the team.
Behavioral & LeadershipOnline Assessment - xAIMediumSoftware EngineerCompute dasher pay from order events
This question evaluates a candidate's ability to process time-based event streams, manage overlapping active intervals, and compute aggregate payouts under concurrency constraints.
Coding & AlgorithmsTechnical Screen - xAIMediumSoftware EngineerCompute total active time per Twitter Space
This problem tests your ability to process chronological event streams to calculate overlapping or continuous active intervals and aggregate durations per category.
Coding & AlgorithmsOnsiteSortingHash MapData Processing - xAIMediumSoftware EngineerContrast processes and threads
This question evaluates understanding of operating system and concurrency fundamentals—specifically differences between processes and threads including memory isolation, resource ownership, scheduling, context-switch costs, inter-process communication versus in-process synchronization, failure isolation, and security.
Coding & AlgorithmsTechnical Screen - xAIMediumSoftware EngineerDesign a Durable Key-Value Cache with File-System Persistence
This question evaluates a candidate's ability to design durable in-memory data structures and persistence strategies, including reasoning about crash recovery, durability guarantees, and performance trade-offs.
System DesignTechnical Screen - xAIMediumSoftware EngineerDesign a Least Frequently Used (LFU) Cache with O(1) Operations
This question evaluates understanding of data structures and algorithm design for implementing a Least Frequently Used (LFU) cache with O(1) get and put operations, emphasizing frequency tracking and least-recently-used tie-breaking.
Coding & AlgorithmsOnsite - xAIMediumSoftware EngineerDesign a Rate Limiter with Per-User Token Quotas
This question evaluates a candidate's ability to design distributed, low-latency rate limiting with heterogeneous per-user quotas, covering competencies in state modeling, consistency, caching, and scalable architecture.
System DesignOnsite
xAI