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

68 Questions 1 Company06.23.2026
Showing 20 results
Role
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+

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...

Coding & Algorithms
9
0
100 people solved
Jun 11, 2026
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+

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 ...

System Design
8
0
58 people solved
Jun 11, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer Locked

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...

System Design
10
0
85 people solved
Jun 23, 2026
LinkedIn logo
LinkedIn
Easy
Software Engineer

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...

System Design
13
0
126 people solved
Apr 11, 2026
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+

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...

System Design
21
0
160 people solved
Apr 2, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer Locked

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...

Coding & Algorithms
1
0
12 people solved
Jun 23, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer

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 ...

Coding & Algorithms
17
0
129 people solved
Jan 9, 2026
LinkedIn logo
LinkedIn
Easy
Software Engineer Locked

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...

System Design
6
0
88 people solved
Mar 10, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer Locked

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...

System Design
15
0
205 people solved
Jan 12, 2026
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+

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...

System Design
10
0
105 people solved
Feb 16, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer

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...

System Design
19
0
164 people solved
Dec 8, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

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...

System Design
9
0
147 people solved
Nov 21, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

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...

Behavioral & Leadership
11
0
123 people solved
Oct 20, 2025
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+

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, ...

Behavioral & Leadership
7
0
62 people solved
Feb 16, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer Locked

Design a meeting scheduler API

This question evaluates object-oriented design, interval data-structure and algorithmic thinking, and concurrent programming competence by requiring a...

Software Engineering Fundamentals
11
0
204 people solved
Feb 12, 2026
LinkedIn logo
LinkedIn
Medium
Software Engineer

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...

System Design
10
0
113 people solved
Nov 20, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

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...

Coding & Algorithms
8
0
137 people solved
Oct 20, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

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 ...

System Design
19
0
142 people solved
Nov 21, 2025
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+ Locked

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...

System Design
16
0
175 people solved
Dec 26, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

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...

Coding & Algorithms
0
0
8 people solved
Jun 23, 2026

Frequently Asked Questions

How difficult are LinkedIn Software Engineer interview questions?
LinkedIn Software Engineer interview questions are generally rated from medium to hard and test both algorithmic fluency and practical engineering judgment. Expect LeetCode-style data-structures and algorithms problems that require clear complexity analysis, plus system-design or architecture questions at more senior levels. Behavioral and product-oriented discussions probe collaboration and ownership. The process is selective and emphasizes correctness, clarity, and tradeoff thinking more than trivia. Candidates who practice timed coding, whiteboard-style explanation, and concise system tradeoffs tend to perform better overall.
What does the typical interview process look like and where do Software Engineer topics appear?
Publicly reported LinkedIn interview loops often begin with an online assessment or recruiter screen, followed by one or two technical phone screens that focus on coding and fundamentals, and then an onsite or virtual loop with multiple interviews covering coding, system design, and behavioral fit. Coding questions appear in the take-home or phone screens and again in the loop; system design is usually a separate mid-to-senior level round; behavioral and collaboration questions appear in a host manager or culture interview. This sequencing is a common pattern candidates report across resources.
How should I plan my interview preparation timeline for a Software Engineer role?
Aim for a focused 6–12 week plan depending on experience: early weeks should solidify language fundamentals and core data structures, middle weeks should emphasize timed problem solving and mock interviews, and final weeks should concentrate on system design sketches, coding under time pressure, and polishing behavioral stories. Include regular, realistic mock interviews and review incorrect problems by writing clean, tested solutions. If you have only a few weeks, prioritize problem patterns commonly seen in interviews and two or three system-design templates you can adapt. Adjust pacing to your current strengths and target level.
What key subtopics should I master for LinkedIn Software Engineer interviews?
Focus on core data structures and algorithms—arrays, strings, trees, graphs, heaps, hash tables—and on algorithmic patterns like two-pointers, sliding window, recursion, and dynamic programming. For higher levels, emphasize system design fundamentals: APIs, data modeling, scaling, caching, consistency, and reliability. Also practice complexity analysis, testing and edge-case handling, concurrency principles, and debugging. Demonstrable knowledge of software engineering practices such as testing, CI, and code organization is valuable, as interviewers often look for practical tradeoff reasoning alongside algorithmic correctness.
What standout tips and common pitfalls should I know for LinkedIn Software Engineer interviews?
Speak clearly about assumptions and constraints, start with a simple correct solution and iterate toward optimizations, and write test cases or explain edge cases. For system design, drive the conversation with clarified requirements and justify tradeoffs. Common pitfalls include rushing to code without planning, neglecting complexity discussion, failing to ask clarifying questions, and giving vague or non-specific behavioral answers. Practice concisely describing impact and collaboration in past projects. Also check current company guidance on tool use during interviews and follow it; policies around AI or external aids may change.

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