LinkedIn Software Engineer Interview Questions
LinkedIn Software Engineer interview questions often focus on a balanced mix of algorithmic coding, system design, and behavioral scenarios; strong candidates demonstrate both technical depth and product-minded engineering. What’s distinctive about interviewing at LinkedIn is the emphasis on production thinking: interviewers typically evaluate your ability to write clean, efficient code, reason about scalability and reliability, and communicate design trade-offs clearly. Expect rounds that assess data structures and algorithms, high-level architecture for real-world systems, and behavioral prompts that probe ownership, collaboration, and measurable impact. For effective interview preparation, prioritize deliberate practice: solve medium-to-hard coding problems under time pressure, run through end-to-end system design cases with attention to APIs, data models, and trade-offs, and prepare concise STAR stories tied to measurable outcomes. Pair mock interviews with feedback, rehearse explaining complexity and edge cases aloud, and refresh fundamentals relevant to the

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"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Review a Web Application Architecture
You are given a high-level architecture diagram for a web application: Client/Web App -> DNS -> Load Balancer -> Application Service -> Database The a...
Scale a Distributed Randomized Multiset
After designing the randomized multiset on a single machine, explain how you would scale it across multiple servers. The distributed system should sup...
Design a Global Calendar Service
Design a calendar system for users in multiple time zones. The system should support: - creating, updating, deleting, and viewing calendar events - on...
Debug Queues and Solve Arrays
During the coding rounds, the interviewer asked several implementation problems: 1. Debug a priority queue. You are given an array-backed min-heap. Th...
Compute graph distance and impacted services
Part A — Graph shortest distance (BFS) You are given an interface representing a node in an unweighted graph: `java interface Candidate { String id(...
Design a Top-K Ranking Service
Design a service that returns the top K most frequent items for a configurable time window, such as the top 10 search queries in the last hour or the ...
Handle Issues and Onboard Teammates
The manager and communication rounds focused on two prompts: 1. Tell me about a time you handled a cross-functional issue, operational incident, or di...
Implement an LRU cache with follow-ups
Coding: Implement an LRU Cache and discuss concurrency Design and implement an in-memory Least Recently Used (LRU) cache data structure. The cache sho...
Design a Randomized Multiset
Implement a data structure for integers that allows duplicate values and supports the following operations in expected O(1) time: - insert(val): Add o...
How do you win project buy-in?
Answer the following behavioral questions: 1. Describe a time when you proposed a project or technical initiative and convinced your manager and other...
Solve common string and subarray problems
You are given three coding tasks: 1) Reverse a string - Input: a string s. - Output: the string with characters in reverse order. 2) Maximum sum of a ...
Design an in-memory key-value store using maps
Design a low-level key-value store library (like an embedded storage engine) under an interview constraint: you may use only map/dictionary-like data ...
Discuss Projects and Tradeoffs
You are asked to do a deep dive on two past software projects. For each project, explain: 1. The business or engineering problem. 2. Your exact role, ...
Count Trips From Vehicle Logs
You are given a text log of vehicle events on a road system. Each log record contains: - license_plate: a string identifying a vehicle - event_type: o...
Design a malicious-URL checking service using an isMalicious API
Design a backend service that determines whether a given URL is malicious. You have access to an external dependency: - isMalicious(url) -> bool (blac...
Check perfect square using binary search
Perfect Square Check (Binary Search) Given a positive integer n, determine whether it is a perfect square (i.e., there exists an integer x such that x...
Compute inverse-depth weighted sum of nested lists
Inverse-Depth Weighted Sum of a Nested List You are given a nested list of integers. Each element is either: - an integer, or - another nested list. D...
Design an exception monitoring system with top‑K
System Design: Exception Monitoring with Top-K Design an exception monitoring system for a microservices environment. Core requirements - Services emi...
Explain a past project and critique a prior team
Interview prompts 1. Project deep dive: Pick a past project you worked on and walk through it end-to-end. Be ready to use a whiteboard to explain arch...
Design a meeting scheduler API
Meeting Scheduler (OOD + data structures) Design and implement an in-memory meeting scheduler that stores existing bookings and can answer availabilit...