System designLast seen Oct 2026
Design a Calendar Event Collaboration System
Design event scheduling, attendee responses, calendar reads, and asynchronous invitation delivery.
Open practiceLinkedIn interview practice
LinkedIn Coding Interview and System Design Questions Start with verified evidence.
Practice from 51 LinkedIn-tagged public coding problems, organized only by the stage, topic, difficulty, and recency metadata FastPrep can verify. The broader public catalog also includes 14 system-design exercises.
- Catalog
- 65 public practice assets (51 coding)
- Start here
- Use the stage named in your invitation
- Evidence
- OA · Phone · Onsite metadata, shown in context
OA practice path
Online Assessment
Build a timed implementation rhythm from prompt to edge cases. Problems are ranked by repeated public catalog sightings.
| Company | Problem | Difficulty | Public evidence | Action |
|---|---|---|---|---|
LILinkedIn | Find the PathGraphBinary Search | Hard | 1 public reportLast reported Mar 2025 | Practice |
LILinkedIn | Split Array Largest SumDynamic ProgrammingBinary Search | Medium | 1 public reportLast reported Mar 2025 | Practice |
LILinkedIn | Longest String ChainDynamic ProgrammingHash Table | Medium | 1 public reportLast reported Feb 2025 | Practice |
LILinkedIn | Find Number of Perfect PairsArrayMath | Medium | 1 public reportLast reported Feb 2025 | Practice |
LILinkedIn | Optimize Context SwitchingGreedyArray | Hard | 1 public reportLast reported Oct 2024 | Practice |
LILinkedIn | Efficient TrekDynamic ProgrammingArray | Hard | 1 public reportLast reported Oct 2024 | Practice |
LILinkedIn | Get Process TimeDynamic ProgrammingGreedy | Hard | 1 public reportLast reported Oct 2024 | Practice |
LILinkedIn | Find the SubstringStringTwo Pointers | Easy | 1 public reportLast reported Sep 2024 | Practice |
Phone practice path
Phone Screen
Practice solving while explaining assumptions, tradeoffs, and complexity. Problems are ranked by repeated public catalog sightings.
26 LinkedIn-tagged Phone Screen problems available.
| Company | Problem | Difficulty | Public evidence | Action |
|---|---|---|---|---|
LILinkedIn | Merge N-Ary Trees by KeyTreeHash Table | Medium | 4 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Repeated Shortest Word Distance QueriesArrayHash Table | Medium | 3 public reportsLast reported Oct 2026 | Practice |
LILinkedIn | Binary Tree Zigzag Level Order TraversalTreeBreadth-First Search | Medium | 3 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Maximum Depth of Binary TreeTreeDepth-First Search | Easy | 3 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Second Minimum in a Tournament TreeTreeDepth-First Search | Medium | 3 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Known Words Matching Phone DigitsStringHash Table | Easy | 2 public reportsLast reported Oct 2026 | Practice |
LILinkedIn | Logistic Regression DiagnosticsMatrixMath | Medium | 2 public reportsLast reported Oct 2026 | Practice |
LILinkedIn | Inverse-Depth Nested List SumStringStack | Medium | 2 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Restricted Decimal Number ValidatorStringParsing | Easy | 2 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Flowerbed Capacity QueriesArrayGreedy | Medium | 2 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Sort a Quadratic-Transformed ArrayArrayTwo Pointers | Medium | 1 public reportLast reported Oct 2026 | Practice |
LILinkedIn | Constant-Time Minimum StackStackArray | Easy | 1 public reportLast reported Oct 2026 | Practice |
LILinkedIn | Randomized String MultisetHash TableArray | Hard | 1 public reportLast reported Oct 2026 | Practice |
LILinkedIn | Move the Nth Linked-List Node to the FrontLinked List | Easy | 1 public reportLast reported Oct 2026 | Practice |
LILinkedIn | Rank-Based Cache with a Data SourceDesignHash Table | Medium | 1 public reportLast reported Oct 2026 | Practice |
LILinkedIn | Kth Largest Element in an ArrayArraySorting | Medium | 1 public reportLast reported Oct 2026 | Practice |
LILinkedIn | Letter Combinations of a Phone NumberStringBacktracking | Medium | 1 public reportLast reported Oct 2026 | Practice |
LILinkedIn | Sum an Arbitrary-Dimensional ArrayArray | Easy | 1 public reportLast reported Oct 2026 | Practice |
LILinkedIn | Find the Intersection Node of Two Linked ListsLinked ListTwo Pointers | Easy | 1 public reportLast reported Sep 2026 | Practice |
LILinkedIn | Permutations IIStringSorting | Medium | 1 public reportLast reported Sep 2026 | Practice |
Onsite practice path
Onsite
Practice complete solutions and defend the choices behind them. Problems are ranked by repeated public catalog sightings.
| Company | Problem | Difficulty | Public evidence | Action |
|---|---|---|---|---|
LILinkedIn | Merge N-Ary Trees by KeyTreeHash Table | Medium | 4 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Binary Tree Zigzag Level Order TraversalTreeBreadth-First Search | Medium | 3 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | LRU Cache with Hit and Miss CountersDesignHash Table | Medium | 3 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Max Points on a LineArrayHash Table | Hard | 3 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Maximum Depth of Binary TreeTreeDepth-First Search | Easy | 3 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Explore an Unknown Grid and Find a PathMatrixGraph | Medium | 3 public reportsLast reported Sep 2026 | Practice |
LILinkedIn | Maximum Consecutive Ones in a Circular ArrayArraySliding Window | Medium | 2 public reportsLast reported Oct 2026 | Practice |
LILinkedIn | Response Time Across a City GridMatrixBreadth-First Search | Medium | 1 public reportLast reported Oct 2026 | Practice |
LILinkedIn | Minimum Window SubstringHash TableSliding Window | Hard | 1 public reportLast reported Sep 2026 | Practice |
LILinkedIn | Users with a Short Sign-In SessionHash TableSorting | Medium | 1 public reportLast reported Sep 2026 | Practice |
LILinkedIn | Max StackStackLinked List | Hard | 1 public reportLast reported Sep 2026 | Practice |
LILinkedIn | Find Leaves of a Binary TreeTreeDepth-First Search | Medium | 1 public reportLast reported Sep 2026 | Practice |
LILinkedIn | Thread-Safe LRU Cache with TTLDesignHash Table | Hard | 1 public reportLast reported Sep 2026 | Practice |
LILinkedIn | Schedule Tasks with an Interval TreeTreeIntervals | Medium | 1 public reportLast reported Sep 2026 | Practice |
LILinkedIn | N-Ary Tree Codec OperationsStringTree | Hard | 1 public reportLast reported Aug 2026 | Practice |
LILinkedIn | Distance to the Nearest Supply PointGraphBreadth-First Search | Medium | 1 public reportLast reported Aug 2026 | Practice |
LILinkedIn | Reconstruct a Graph into a TreeGraphUnion Find | Medium | 1 public reportLast reported Aug 2026 | Practice |
LILinkedIn | Count Distinct Values in a Huge Sorted ArrayArrayBinary Search | Medium | 1 public reportLast reported Aug 2026 | Practice |
LILinkedIn | Find K Closest Elements in a Sorted ArrayArrayBinary Search | Medium | 1 public reportLast reported Aug 2026 | Practice |
LILinkedIn | Power with Integer ExponentsMathRecursion | Medium | 1 public reportLast reported Aug 2026 | Practice |
01 · Preparation plan
Optimize repeated work, then preserve structured state.
LinkedIn's mixed catalog supports a progression from repeated queries to structured-data operations and service design. The key preparation question is what to precompute and what to maintain after updates. LinkedIn spelling variants share this one page so the same company does not acquire competing practice owners. This is a suggested practice sequence, not the employer's interview process. Your invitation and recruiter guidance remain the source of truth.
- 01
Index positions for repeated queries
Preprocess the document once for a batch of queries between two distinct words known to occur in it. Compare rescanning with retaining each word's ordered positions, keeping preprocessing cost separate from query cost.
- Use the guaranteed distinct-word contract rather than inventing a same-word rule.
- Compare two sorted position lists without checking every pair.
- Return distances in query order and explain the preprocessing-versus-query tradeoff.
- 02
Merge trees by identity, not position
The N-ary tree merge exercise asks you to decide what makes two nodes the same. Matching children by their order can silently produce incorrect results.
- Define key collision behavior.
- Test children appearing in only one tree.
- Preserve the output ordering required by the prompt.
- 03
Preserve the specified N-ary tree wire format
This codec has an existing protocol: preorder value:childCount tokens separated by a pipe, with canonical parenthesized tree text on decoding. Follow that grammar rather than designing a new escaping or length-prefix scheme.
- Track each node's remaining children while preserving sibling order.
- Test a leaf, multiple children, and deep nesting within the valid nonempty-tree contract.
- Check round-trip structure and return one result per operation in its original order.
02 · Broader technical practice
Practice beyond standalone coding questions.
These public LinkedIn-tagged exercises cover additional technical formats. They are included only when a verified catalog record and a crawlable practice page both exist.
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Design a Personalized Recruiter Outreach Platform
Search a billion-profile talent corpus and generate reviewable outreach grounded in a selected candidate and job.
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Design a Time Series Metrics Database
Design a high-cardinality metrics database for durable ingestion, range queries, rollups, late data, and retention.
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Design a Personalized Recommendation System
Design event ingestion, candidate retrieval, ranking, and serving for a bounded personalized user-item catalog.
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CI/CD Pipeline Orchestration System
Design a multi-tenant CI/CD control plane that safely orchestrates dependency-aware pipeline runs across regional data-plane worker fleets.
Open practiceSystem designLast seen Oct 2026
Design a Scheduled Job Execution System
Design a durable one-time and recurring job service with stable occurrence identity, at-least-once execution safety, and private object-storage logs for every run.
Open practiceSystem designLast seen Oct 2026
Design a Job-Click Prediction Platform
Train and serve job-click predictions from member, job, and interaction data without leakage or train-serving skew.
Open practiceSystem designLast seen Sep 2026
Design an Ads Bidding, Pacing, and Forecast Platform
Design an online bid and budget-pacing path backed by a rule-based pacer and a versioned machine-learning forecast pipeline with a safe fallback.
Open practiceSystem designLast seen Sep 2026
Malicious IP Traffic Filtering Platform
Design a global system that derives time-bounded IP traffic decisions and enforces them at low-latency ingress points.
Open practiceSystem designLast seen Sep 2026
Design a Recent User-Activity Query System
Design an event-time analytics service that enriches user activity and serves trustworthy recent and historical counts with different latency goals.
Open practiceSystem designLast seen Sep 2026
Design a High-Throughput Single-Node Key-Value Store
Design one-node storage for fifty million key-value pairs and a million operations per second, then define the boundary where the constraint must change.
Open practiceSystem designLast seen Aug 2026
Design a Job Listing Freshness Platform
Design a platform that detects stale job listings, reconciles conflicting evidence, and keeps candidate-facing discovery current.
Open practiceSystem designLast seen Aug 2026
Design a Rolling Shared-Article Leaderboard
Maintain top-N shared articles across five-minute, one-hour, and twenty-four-hour rolling windows.
Open practiceSystem designLast seen Aug 2026
Design a Ranked Hybrid Social Feed
Design a scalable ranked feed that combines queued fanout, read-time merging, bounded inbox history, and immediate visibility for a user's own posts.
Open practice03 · Evidence boundary
What “LinkedIn interview questions” means here.
It means practicing transferable implementation, testing, and technical reasoning with public catalog assets FastPrep tags to LinkedIn. It does not mean FastPrep has access to the company's assessments or any private interview bank.
Repeated public sightings and last-reported dates can help you prioritize practice, but they cannot predict the questions, format, or platform in a specific interview.
- Only LinkedIn-tagged FastPrep catalog problems appear above.
- Stage labels and report dates remain visible as context.
- No official, private, leaked, or proprietary questions are claimed.
04 · Plain answers
LinkedIn interview practice questions, answered plainly.
This page owns technical-practice intent for LinkedIn. Hiring activity, timelines, and market signals remain on the separate hiring-insights page.
01Why does this LinkedIn plan emphasize repeated queries?
The public inventory contains exercises such as repeated word-distance queries and large sorted-array operations, where preprocessing can change query cost. That makes reuse of prior work a useful study theme. It is an editorial recommendation from the practice set, not a claim that every LinkedIn interview asks the same pattern.
02Is FastPrep affiliated with LinkedIn?
No. FastPrep is an independent interview-preparation product and is not affiliated with LinkedIn. The page uses FastPrep's public practice catalog and does not claim official, private, leaked, or proprietary employer questions.
03How are LinkedIn problems assigned to interview stages?
Stage labels come from FastPrep's public problem metadata. A problem can carry more than one reported stage, and hiring processes can change by role, level, location, and date. Treat the labels as preparation context, not a guarantee.
04Which LinkedIn interview stage should I practice first?
Start with the stage named in your invitation or recruiter message. If no stage is known, use the largest available set to build general problem-solving fluency, then rehearse explanation and testing separately.
05Does this page predict the LinkedIn interview process?
No. Public catalog counts, stage tags, and last-reported dates can help prioritize practice, but they cannot predict a specific interview's questions, sequence, timing, or platform.
Your next stage, made concrete
Pick a problem. Solve it end to end.
Start with the stage named in your invitation, then use public evidence as context—not as a promise of what you will be asked.
Open the practice set