Tutorials System Design Tutorial
Twitter/X Architecture Case Study — Complete Guide
Twitter/X Architecture Case Study — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of System Design Tutorial on Toolliyo Academy.
On this page
System Design Tutorial · Lesson 95 of 100
Twitter/X Architecture Case Study
Basics ✓ → Scale ✓ → Interview
Interview · 3 — Case studies · ~10 min · Module 10: Real-World System Design Projects
What is this?
Twitter/X-style feeds emphasize fan-out, timelines, caching, and eventually consistent social graphs at huge read amplify.
Why should you care?
ShopNest social proof (followers of a brand, activity feeds) reuses fan-out vs fan-in trade-offs.
See it live — copy this example
Sketch the architecture on paper. These lessons focus on concepts and trade-offs.
Fan-out on write: push to follower timelines (heavy writers)
Fan-out on read: pull from followed authors (heavy readers)
Hybrid for celebrities
Cache hot timelines
Lesson: pick fan-out based on graph shapeRun Example »
This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.
What happened?
- Write fan-out helps read-heavy feeds but hurts mega-followers.
- Hybrids special-case celebrities.
- Caching softens hot timelines.
Practice next
- Decide ShopNest brand-follow feed strategy.
- Special-case very popular brands.
- Cache timelines with short TTL.
- Async like counters.
- Precompute top brand feeds.
Remember
Fan-out trade-offs matter. Hybrid for celebrities. Cache hot feeds.
Brand activity feed
ShopNest uses hybrid fan-out for brand followers.
Outcome: Mega-brands do not melt write path.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
Sign in to ask a question or upvote helpful answers.
No questions yet — be the first to ask!
