System design

LinkedIn System Design Questions

Every system design problem candidates reported at LinkedIn between September 2025 and September 2026, most-asked first. Each one links to a full solution. Tick them off as you go.

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11problems
18candidate reports
6asked more than once
16topics
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Companies

Meta26Microsoft24Amazon23OpenAI22Google20TikTok16Salesforce15Anthropic15Uber12LinkedIn11Apple11JPMorgan11Atlassian11Snowflake9Netflix9Oracle9Goldman Sachs8Rippling8Databricks7Walmart7Airbnb7Capital One7NVIDIA6Pinterest6Roblox6Flipkart4Bloomberg4Visa4Adobe4Anduril1

Topics

Design a Top-K Ranking Service
3 reports · last seen Mar 2026AnalyticsReal-timeAlgorithms
Advanced+4▶ Mock
Design a Multi-Region Malicious-IP Detection System
2 reports · last seen Sep 2026SecurityReal-timeCaching
Advanced▶ Mock
Scale a NoSQL Key–Value Store to One Million QPS
2 reports · last seen Aug 2026DatabasesDistributed SystemsStorage
Advanced+2▶ Mock
Design a CI Job Scheduler with Live Build Output
2 reports · last seen Aug 2026SchedulingDistributed SystemsStorage
Advanced▶ Mock
Design a Calendar System
2 reports · last seen Jun 2026SchedulingDistributed SystemsStorage
Intermediate+2▶ Mock
Design a metrics platform without alerting
2 reports · last seen Dec 2025ObservabilityData PipelinesStorage
Advanced+3▶ Mock
Reduce Stale Listings in a Job Marketplace
1 report · last seen Sep 2026Data PipelinesAI / MLSearch
Intermediate▶ Mock
Collect and Query Recent User Activity
1 report · last seen Aug 2026AnalyticsData PipelinesStorage
Intermediate▶ Mock
Design a Ranked Social Feed with Hybrid Fan-Out
1 report · last seen May 2026Distributed SystemsMediaSearch
Advanced+2▶ Mock
Review a Web Application Architecture
1 report · last seen Apr 2026Distributed SystemsSecurityObservability
Intermediate▶ Mock
Design scalable job scheduler and query dashboard
1 report · last seen Nov 2025SchedulingDistributed SystemsEvent Driven
Advanced+7▶ Mock

Duplicate reports of the same problem are merged and counted.

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Frequently Asked Questions

What system design questions does LinkedIn ask?

Candidates reported 11 distinct system design problems at LinkedIn between September 2025 and September 2026, including Design a Top-K Ranking Service, Design a Multi-Region Malicious-IP Detection System, Scale a NoSQL Key–Value Store to One Million QPS.

How to prepare for LinkedIn system design interview?

Start with the LinkedIn problems reported most often, work through each full solution, then practice explaining a design end to end under time pressure in a mock interview.

What is the difference between HLD and LLD at LinkedIn?

HLD (High-Level Design) focuses on system architecture, scalability, and component interactions. LLD (Low-Level Design) dives into class diagrams, API contracts, and database schemas. LinkedIn tests both.