LinkedIn Coding & Algorithms Interview Questions

LinkedIn Coding & Algorithms interview questions typically focus on clean, production-minded problem solving rather than trick puzzles. Interviews evaluate algorithmic thinking, data-structure choice, complexity trade‑offs, and communication: you’ll be expected to write correct, readable code in a shared editor (CoderPad or similar), explain time/space complexity, and walk through edge cases and tests. Expect an initial 45–60 minute technical screen with one or two coding problems and a later virtual onsite with multiple rounds that probe depth, follow-up optimizations, and your ability to iterate under feedback. For effective interview preparation, practice core patterns (two pointers, sliding window, DFS/BFS, heaps, dynamic programming) and rehearse explaining your thought process aloud while coding. Time-boxed mock interviews replicate pressure and reveal gaps; review common pitfalls like off‑by‑one errors, null handling, and inefficient data structures. Emphasize clear variable names, incremental testing, and trade‑off discussion during the interview—these signal seniority and team fit as much as a correct final solution.

51 Questions 1 Company06.23.2026
Showing 11 results
Role
LinkedIn logo
LinkedIn
Medium
Software EngineerSenior+ Locked

Compute graph distance and impacted services

This question evaluates proficiency in graph algorithms and traversal (shortest-path/BFS and cycle handling), file-path/tree modeling, dependency grap...

Coding & Algorithms
15
0
164 people solved
Dec 26, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

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...

Coding & Algorithms
15
0
207 people solved
Dec 8, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

Count connected land components in a grid

You are given a 2D grid of characters where: - '1' represents land - '0' represents water A group of land cells forms an island if they are connected ...

Coding & Algorithms
9
0
85 people solved
Nov 21, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

Validate parentheses with one or three bracket types

Problem Given a string s consisting only of bracket characters, determine whether it is valid. A string is valid if: - Every opening bracket has a cor...

Coding & Algorithms
5
1
65 people solved
Oct 20, 2025
LinkedIn logo
LinkedIn
Medium
Data Scientist

Implement fast sampling for weighted k-sided die

You must sample from a categorical distribution over k outcomes with probabilities p1..pk (sum to 1) without using built-in categorical samplers. You ...

Coding & Algorithms
4
0
89 people solved
Oct 13, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

Solve six algorithmic problems

Answer the following independent algorithmic prompts. For each, explain your approach, justify data structures, analyze time/space complexity, and pro...

Coding & Algorithms
7
0
135 people solved
Sep 6, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

Determine sanitized palindrome in string

Write a function that determines whether a string is a palindrome after removing non-alphanumeric characters and ignoring case (e.g., punctuation, whi...

Coding & Algorithms
6
0
61 people solved
Sep 6, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

Detect intersection of two linked lists

Given two singly linked lists that may converge to share a common tail, determine whether they intersect and return the first node at which they join....

Coding & Algorithms
4
0
59 people solved
Sep 6, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

Find lowest common ancestor

Question LeetCode 236. Lowest Common Ancestor of a Binary Tree — Given a binary tree, find the lowest common ancestor (LCA) of two given nodes. Follow...

Coding & Algorithms
8
0
35 people solved
Jul 29, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

Reverse a linked list

Question LeetCode 206. Reverse Linked List — Given the head of a singly linked list, reverse the list and return the reversed list. https://leetcode.c...

Coding & Algorithms
5
0
18 people solved
Jul 29, 2025
LinkedIn logo
LinkedIn
Medium
Software Engineer

Solve min window & animal conflicts

Question LeetCode 76. Minimum Window Substring: Given strings s and t, return the smallest substring of s that contains every character of t (includin...

Coding & Algorithms
21
0
54 people solved
Jul 29, 2025

Frequently Asked Questions

How difficult are LinkedIn Coding & Algorithms interview questions?
LinkedIn Coding & Algorithms interview questions typically span a range from easy to hard, but many land in the medium-to-hard category for software engineering roles. Interviewers are less interested in memorized solutions and more focused on your ability to decompose problems, reason about complexity, and deliver correct, well-tested code under time constraints. Expect algorithmic patterns like two pointers, DFS/BFS, heaps, and dynamic programming to appear, often with additional constraints that push you to optimize. If you can clearly explain tradeoffs, write clean code and handle edge cases, you’ll be well positioned even for tougher problems.
What is the typical LinkedIn interview process and where do Coding & Algorithms questions appear?
LinkedIn’s technical hiring process usually begins with a recruiter screen and then one or more technical interviews that include Coding & Algorithms challenges. These problems commonly appear in online assessments or take-home tasks used early to filter candidates, in remote technical phone or video screens where you code in a shared editor, and in onsite or final loop interviews where two focused coding rounds assess algorithmic problem solving. Depending on level, you may also face system design or behavioral interviews, but Coding & Algorithms is the throughline for most engineering roles and is evaluated at multiple stages.
How long should I prepare for LinkedIn Coding & Algorithms interviews (timeline)?
Preparation time varies by experience and current skill level, but a focused six to twelve week plan is a practical target for most candidates preparing for LinkedIn Coding & Algorithms interviews. Early weeks should refresh core data structures and algorithmic patterns, the middle weeks should emphasize solving representative problems and timed practice on shared editors, and the final weeks should focus on mock interviews, systematizing common templates, and polishing communication. If you’re already strong, three to four weeks of deliberate practice and mock interviews can suffice. Consistent, deliberate practice beats last-minute cramming.
What key subtopics within Coding & Algorithms should I prioritize for LinkedIn interviews?
Prioritize mastery of arrays and strings, pointer techniques and sliding windows, hash maps for frequency and lookup problems, and linked lists for in-place manipulations. Trees and graphs with BFS/DFS, common traversal patterns, and shortest-path reasoning are frequently tested. Dynamic programming and greedy approaches appear on more challenging problems, while heap and priority-queue use cases and union-find show up in specialized tasks. Equally important are understanding algorithmic complexity, writing correct edge-case handling for nulls and bounds, and producing readable, testable code that an interviewer can follow and discuss.
Any standout tips and common pitfalls for LinkedIn Coding & Algorithms interviews?
Start each question by asking clarifying questions and restating constraints so you and the interviewer share expectations. Sketch a clear approach before coding; if time is limited, implement a correct brute force then iterate to an optimized solution while explaining tradeoffs. Test with example inputs including edge cases and watch for off-by-one errors, null values, and overflow. Avoid over-optimizing prematurely and don’t get stuck on micro-optimizations that obscure correctness. During remote rounds, practice in the collaborative editor you’ll use and communicate continuously: silence is often interpreted as confusion, so narrate decisions and invite feedback when uncertain.

Explore more LinkedIn Coding & Algorithms interview questions

Real questions from candidate reports, grouped by role, topic and company.

By role
Other categories at LinkedIn
Coding & Algorithms questions at other companies
Browse all