LearningFeed · System Design

System Design — from the ground up

Track: system-design · generated 2026-09-30

15lessons in curriculum

7rendered

1new today

A-Foundations (4/5 done)

From one server to a website: DNS, web tier, database

A-Foundations Day 2

Scaling out: load balancers, replication, cache, CDN

A-Foundations Day 3

Back-of-the-envelope estimation: QPS, storage, availability

A-Foundations Day 4

A 4-step framework for any system design interview

Day 15 · 🔒

Reliable, scalable, maintainable: the three pillars (DDIA ch1)

A-Foundations · not yet generated

B-Building blocks (3/10 done)

Design a rate limiter: token bucket, sliding window, Redis

B-Building blocks Day 6

Consistent hashing: why hash % N breaks and how to fix it

B-Building blocks Day 7

Design a key-value store: partitioning, replication, consistency

B-Building blocks

Day 8 · 🔒

Unique ID generation in distributed systems: snowflake

B-Building blocks · not yet generated

Day 9 · 🔒

Design a URL shortener: encoding, hashing, 301 vs 302

B-Building blocks · not yet generated

Day 10 · 🔒

Design a web crawler: BFS frontier, politeness, dedup

B-Building blocks · not yet generated

Day 11 · 🔒

Design a notification system: queues, retries, fan-out

B-Building blocks · not yet generated

Day 12 · 🔒

Design a news feed: push vs pull, fan-out on write vs read

B-Building blocks · not yet generated

Day 13 · 🔒

Design a chat system: long polling, WebSocket, online status

B-Building blocks · not yet generated

Day 14 · 🔒

Design search autocomplete: trie, sampling, sharding

B-Building blocks · not yet generated