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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 1201–1230 of 2336 results
- LinkedInMediumSoftware EngineerExplain the Design of a Recent Feature
Tests your ability to communicate software design clearly by breaking down a production feature into its architecture, trade-offs, individual ownership, and verification strategy.
Software Engineering FundamentalsOnsiteSystem DesignTechnical CommunicationArchitecture - LinkedInMediumSoftware EngineerExplain your most impactful project clearly
This question evaluates technical communication, system design, architectural reasoning and leadership competencies by requiring a clear description of system components, data flow, individual responsibilities, trade-offs, and measurable impact.
Behavioral & LeadershipOnsite - LinkedInMediumSoftware EngineerFewest-Edge Distance Between Two Nodes in a Directed Acyclic Graph
Given a directed acyclic graph and two nodes, return the fewest edges on a directed path from the source to the target, 0 when they are the same node, or -1 when the target cannot be reached. Asked as a follow-up to topological ordering, it tests traversal of dependency graphs.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerFind dictionary words matching a phone digit string
This problem tests your ability to map phone keypad digits to characters and efficiently filter a provided dictionary to find words that match a specific digit sequence.
Coding & AlgorithmsOnsiteStringHash TableTrie - LinkedInMediumSoftware EngineerFind lowest common ancestor
This question evaluates understanding of binary tree structure, lowest common ancestor concepts, and competency in algorithmic reasoning and tree traversal within the Coding & Algorithms category.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerFind the K Closest Values in a Sorted Array
This problem tests binary search and window optimization to find the k nearest elements to a target in a sorted integer array.
Coding & AlgorithmsOnsiteBinary SearchTwo PointersArrays - LinkedInMediumSoftware EngineerFind the K Values Closest to a Target in a Binary Search Tree
Given a binary search tree described by its preorder traversal, a real-valued target and an integer k, return the k node values closest to the target in ascending order, breaking distance ties toward the smaller value. Tests binary search tree traversal, reasoning over ordered data and precise tie handling.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerFind the Maximum Depth of a Binary Tree
Find binary-tree depth from a portable child-index representation, including empty trees and highly unbalanced root-to-leaf paths.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerFind the k-th largest element in an array
This question evaluates proficiency with selection algorithms, array manipulation, and analysis of time and space complexity, reflecting competency in order-statistics and basic data structures.
Coding & AlgorithmsOnsite - LinkedInEasySoftware EngineerHandle Issues and Onboard Teammates
This question evaluates leadership, cross-functional communication, incident management, and knowledge-transfer competencies by probing how a candidate resolves stakeholder disagreements and explains team-owned systems.
Behavioral & LeadershipOnsite - LinkedInMediumSoftware EngineerImplement Fast Power with Negative Exponents
This problem tests your ability to implement the exponentiation by squaring algorithm while correctly handling edge cases like negative exponents and integer overflow.
Coding & AlgorithmsOnsiteAlgorithmsMathBit Manipulation - LinkedInMediumSoftware EngineerImplement an LRU cache with follow-ups
This question evaluates understanding of core data structures and algorithms for designing an efficient LRU cache as well as knowledge of concurrency and synchronization for thread-safe access.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerLargest Sum of a Non-Empty Contiguous Subarray
Given an integer array, return the largest sum of any non-empty contiguous subarray, including arrays in which every number is negative. This classic phone-screen problem tests efficient array processing and careful handling of edge cases such as all-negative input.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerLexicographically Smallest Topological Order of a Dependency Graph
Given n labeled nodes and directed precedence edges, return an ordering that respects every edge, choosing the lexicographically smallest valid ordering, or an empty list when a cycle makes ordering impossible. It tests topological sorting, cycle detection and deterministic tie-breaking.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerMaximum Product of a Contiguous Subarray With Negatives and Zeros
Given an integer array that may contain negative numbers and zeros, return the largest product of any non-empty contiguous subarray. The problem tests careful reasoning about sign changes, zeros and single-element subarrays under tight input-size limits.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerReverse a linked list
This question evaluates understanding of linked list data structures and proficiency manipulating pointers or references to perform in-place transformations when reversing a linked list. Commonly asked in Coding & Algorithms interviews, it gauges algorithmic thinking and practical application-level competency in list operations rather than purely conceptual theory.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerScale a NoSQL Key–Value Store to One Million QPS
Design a distributed, highly available NoSQL key-value store capable of serving 1M QPS across 50 million key-value pairs with low p99 latency.
System DesignOnsitesystem-designnosqldistributed-systems - LinkedInMediumSoftware EngineerSolve Cache, Window, and Heap Problems
This question evaluates competency in advanced data structures and algorithmic techniques—specifically frequency-based cache design, sliding-window substring search, and heap-driven k-pair generation—along with time and space complexity analysis and robust edge-case handling.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerSolve min window & animal conflicts
This question evaluates understanding of string algorithms, frequency-based sliding window techniques and hashmap/graph-based conflict detection, focusing on minimal substring search and modeling pairwise exclusions.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerSolve six algorithmic problems
This multi-part question evaluates algorithmic problem solving, data-structure selection, complexity analysis, API design, and the handling of trees, arrays, grids, circular structures, and dynamic updates.
Coding & AlgorithmsOnsite - LinkedInMediumSoftware EngineerSolve substring and top‑K pair problems
This problem tests your ability to solve a sliding window string problem followed by a heap-based retrieval task for ranked items.
Coding & AlgorithmsOnsiteSliding WindowHeapString Manipulation - LinkedInMediumSoftware EngineerTraverse a Binary Tree in Zigzag Level Order
Return binary-tree values level by level while alternating left-to-right and right-to-left order without changing level membership.
Coding & AlgorithmsOnsite - Luma AIMediumSoftware EngineerBuild Collaborative Document Editing Shared by People and AI Agents
A take-home asks you to build collaborative document editing in which people and AI agents edit the same document, then defend its scaling limits and add approval, audit history and selective revert for agent edits. Tests concurrency control, real-time sync, anchoring slow agent edits, attribution, and prototype scoping.
System DesignOnsite - Luma AIMediumSoftware EngineerBuild a Scalable Text-to-Speech Service Prototype, Then Defend and Extend It
An 8 to 12 hour take-home asks you to build a scalable text-to-speech service with AI coding agents, then defend its trade-offs and scaling limits in a product review and plan a new customer requirement. Tests 0-to-1 scoping, streaming and batch synthesis design, capacity reasoning, and estimation and roadmap skills.
System DesignOnsite - Luma AIMediumSoftware EngineerExplain Your Motivation and How You Use AI Development Tools in Your Workflow
A recruiter screen for an AI product engineering role asks about your motivation for moving, why this company, your hands-on experience with AI development tools and workflows, and which areas of development interest you. Tests concrete, verifiable examples of agent-assisted work and a coherent career story.
Behavioral & LeadershipOnsite - Luma AIMediumSoftware EngineerReverse-Engineer an App's Undocumented API and Rebuild It With Better UX
A take-home asks you to reverse-engineer the undocumented API behind an existing app and rebuild the app with a better user experience, then review its fragility and extend it with safe write support. Tests API discovery, schema inference, resilient client design, credential and legal judgment, and UX scoping.
Software Engineering FundamentalsOnsite - LyftMediumSoftware EngineerAssign Tasks to the Minimum Number of Workers
Assign interval tasks to the minimum number of workers while preserving deterministic worker IDs and original output order. Reason about overlapping times, tie handling, resource reuse, efficient scheduling at scale, and boundary cases where one task ends as another begins.
Coding & AlgorithmsOnsite - LyftMediumSoftware EngineerDescribe a challenging resume project
Describe a challenging resume project evaluates behavioral evidence, ownership, communication, trade-offs, and measurable outcomes in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Behavioral & LeadershipOnsite - LyftMediumSoftware EngineerDescribe a failure and learning
This question evaluates a candidate's leadership, accountability, stakeholder communication, reflection, and ability to learn from failure within software engineering projects.
Behavioral & LeadershipOnsite - LyftMediumSoftware EngineerDesign One-to-One Messaging Across Multiple Devices
Tests the ability to architect a real-time, one-to-one messaging system supporting multi-device synchronization, push notifications, idempotent message delivery, and reliable cursor-based history pagination.
System DesignOnsitesystem-designdistributed-systemsmessaging
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