HLD contents
HLD Academy
Problem Library
Read solved system design problems with requirements, APIs, architecture choices, and deep dives in one consistent format.
Solved problems
6
Design sections
146
Source
Local content
URL ShortenerRedirectionAnalytics
Template
Generate short URLs, redirect users to original URLs, and track click analytics.
116 sections
OpenURL ShortenerRedirectionAnalytics
URL Shortener
Generate short URLs, redirect users to original URLs, and track click analytics.
8 sections
OpenAdsAnalyticsEvent Processing
Google Ads
Serve ads, track impressions/clicks/conversions, and provide campaign analytics to advertisers.
6 sections
OpenTopKRankingAnalytics
Top K System
Track item activity and return top K items globally or by category for a given time window.
6 sections
OpenRate Limiter
Protect APIs and downstream services by limiting how many requests a client can make within a configured period.
5 sections
OpenNotificationQueueDelivery
Notification System
Send notifications to users across email, SMS and push channels with basic delivery tracking.
5 sections
Open