System Design

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System Design (HLD + LLD)

Set Curated practice set

Problems
60
Types
2
Topics
6

Learn the fundamentals

28 illustrated guides, about 5 hours of reading. Start with the three foundations, then dip into a building block or a worked design whenever a question needs it.

Open the full guide
  1. 1Foundation · 8 minScaling a web app from one server to millions of usersLoad balancers, replication, caching, CDNs, stateless tiers, queues and sharding: the building blocks every design reuses.
  2. 2Foundation · 3 minCapacity estimation in your headPowers of two, latency numbers, availability nines and a worked QPS and storage estimate.
  3. 3Foundation · 3 minThe system design interview playbookA four-step flow (scope, high-level design, deep dive, wrap-up), what to say, what to avoid, and how to split 45 minutes.
60 problems
1.URL Shortener (TinyURL / bit.ly)
Easy1 co.
2.Distributed Rate Limiter
Medium1 co.
3.Distributed Cache (Redis / Memcached)
Medium1 co.
4.Notification System (push, SMS, email)
Medium1 co.
5.Chat / Messaging System (WhatsApp, Slack)
Hard1 co.
6.News Feed (Facebook / Instagram / LinkedIn feed)
Hard1 co.
7.Video Streaming Platform (YouTube / Netflix)
Hard1 co.
8.Web Crawler
Hard1 co.
9.Search Autocomplete / Typeahead
Medium1 co.
10.Ride-Sharing Service (Uber / Ola)
Hard1 co.
11.Food Delivery Platform (Swiggy / Zomato)
Hard1 co.
12.E-commerce Platform & Flash Sale (Flipkart Big Billion Day)
Hard1 co.
13.Payment System (Stripe / Razorpay)
Hard1 co.
14.Distributed Unique ID Generator (Snowflake)
Easy1 co.
15.Distributed Key-Value Store (Dynamo / Cassandra)
Hard1 co.
16.Distributed Message Queue (Kafka)
Hard1 co.
17.Cloud File Storage & Sync (Google Drive / Dropbox)
Hard1 co.
18.Proximity / Nearby Places Service (Yelp, Google Maps 'near me')
Medium1 co.
19.Movie / Event Ticket Booking (BookMyShow)
Hard1 co.
20.Hotel Reservation System (Airbnb / Booking.com)
Medium1 co.
21.Stock Exchange / Order Matching Engine
Hard1 co.
22.Metrics Monitoring & Alerting System (Datadog / Prometheus)
Hard1 co.
23.Ad Click Event Aggregation
Hard1 co.
24.Twitter / X (tweets, timeline, search)
Hard1 co.
25.Photo Sharing App (Instagram)
Medium1 co.
26.Real-time Gaming Leaderboard
Medium1 co.
27.Distributed Job Scheduler (cron-as-a-service, Airflow-like)
Hard1 co.
28.Email Service (Gmail-like)
Hard1 co.
29.Log Aggregation & Search (ELK / Splunk-like)
Medium1 co.
30.Digital Wallet (Paytm / PhonePe balance & transfers)
Hard1 co.
31.Online Coding Judge (LeetCode / HackerRank)
Medium1 co.
32.Collaborative Document Editing (Google Docs)
Hard1 co.
33.Maps & Navigation (routing, ETA)
Hard1 co.
34.Live Video Streaming (Twitch / Hotstar live match)
Hard1 co.
35.Distributed Lock / Coordination Service (ZooKeeper-like)
Hard1 co.
36.Pastebin / Text Sharing Service
Easy1 co.
37.E-commerce Product Search (Amazon / Flipkart search)
Hard1 co.
38.API Gateway (auth, routing, rate limiting, observability)
Medium1 co.
39.Recommendation System (product / video recommendations)
Hard1 co.
40.Consistent Hashing (Data Partitioning)
Medium1 co.
41.Nearby Friends (Live Location Sharing)
Hard1 co.
42.S3-like Object Storage
Hard1 co.
43.Parking Lot
Easy1 co.
44.Elevator System
Medium1 co.
45.LRU / LFU Cache
Easy1 co.
46.Splitwise (expense sharing)
Medium1 co.
47.Movie Ticket Booking (BookMyShow) — LLD
Medium1 co.
48.Board Games: Tic-Tac-Toe / Snake & Ladder
Easy1 co.
49.Chess
Hard1 co.
50.Vending Machine (State pattern)
Easy1 co.

Showing 1–50 of 60

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