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

"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"

"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"

"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."

"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."

"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."

"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."

"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."
Merge Keyed N-Ary Trees
Merge Keyed N-Ary Trees An N-ary tree node contains a unique string key among its siblings and a list of children. Implement merge_trees(a, b) for two...
Design a CI/CD Task Scheduler
Design a CI/CD Task Scheduler Design the scheduling core of a continuous-integration and continuous-delivery system. A pipeline is a directed acyclic ...
Design a Calendar System
This question evaluates a candidate's ability to design a large-scale calendar backend, covering data modeling for events, recurrence, invitations, an...
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...
Longest Run of Ones After One Flip
This question tests a candidate's ability to solve a sliding window problem involving binary arrays, extending the basic "maximum consecutive ones" pa...
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 a Top-K Ranking Service
This question evaluates a candidate's ability to design scalable, real-time Top-K ranking services, testing competencies in distributed systems, strea...
Design a malicious-URL checking service using an isMalicious API
This question evaluates system design competencies such as scalable API design, caching and cache invalidation strategies, rate limiting and backpress...
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...
Design a scalable key-value store
System Design: Distributed Key-Value Store Design a distributed key-value (KV) storage service for a large-scale backend system. The service should ex...
Design a company-wide monitoring system
You are asked to design a monitoring system used company-wide. Goals - Collect and query telemetry for many services/hosts - Support alerting and dash...
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...
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, ...
Design a meeting scheduler API
This question evaluates object-oriented design, interval data-structure and algorithmic thinking, and concurrent programming competence by requiring a...
Design scalable job scheduler and query dashboard
Design a scalable, fault-tolerant job scheduling system. The system should allow clients to schedule background jobs (for example, sending emails or r...
Group words that map to same phone digits
Problem On a classic phone keypad (T9), letters map to digits: - 2: ABC, 3: DEF, 4: GHI, 5: JKL, - 6: MNO, 7: PQRS, 8: TUV, 9: WXYZ Given a list of lo...
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 ...
Design a metrics platform without alerting
This question evaluates a candidate's ability to design a scalable time-series metrics platform, covering data modeling for counters/gauges/histograms...
The Celebrity Problem
The Celebrity Problem At a party there are n people, labeled 0 to n - 1. Among them there may be exactly one celebrity — a person who satisfies both o...