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System design in 60 days
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Week 1: ground truth
Day 1: how slow is slow?
Day 1 lab results
Day 1 drills
Day 1 posts
Day 2: estimation vs reality
Day 2 lab results
Day 2 estimates
Day 2 posts
Day 3: what happens when you type a URL
Day 3 lab results
Day 3 drills
Day 3 posts
Day 4: latency, throughput and the queue
Day 4 lab results
Day 4 drills
Day 4 posts
Day 5: designing an API
Day 5 lab results
Day 5 drills
Day 5 posts
Day 6: more than one server
Day 6 lab results
Day 6 drills
Day 6 posts
Day 7: your first real design
Day 7 design template
Day 7 drills
Day 7 posts
Week 2: storage
Day 8: how a row sits on disk
Day 8 lab results
Day 8 drills
Day 8 posts
Day 9: B-trees and LSM trees
Day 9 lab results
Day 9 drills
Day 9 posts
Day 10: indexes in depth
Day 10 lab results
Day 10 drills
Day 10 posts
Day 11: transactions and isolation
Day 11 lab results
Day 11 drills
Day 11 posts
Day 12: replication and lag
Day 12 lab results
Day 12 drills
Day 12 posts
Day 13: partitioning and sharding
Day 13 lab results
Day 13 drills
Day 13 posts
Day 14: designing a storage layer
Day 14 design template
Day 14 drills
Day 14 posts
Week 3: caching and the CDN
Day 15: caching and the cache-aside pattern
Day 15 lab results
Day 15 drills
Day 15 posts
Day 16: eviction and the working set
Day 16 lab results
Day 16 drills
Day 16 posts
Day 17: the thundering herd
Day 17 lab results
Day 17 drills
Day 17 posts
Day 18: hot keys and the celebrity problem
Day 18 lab results
Day 18 drills
Day 18 posts
Day 19: Redis internals and pipelining
Day 19 lab results
Day 19 drills
Day 19 posts
Day 20: the CDN and cache invalidation
Day 20 lab results
Day 20 drills
Day 20 posts
Day 21: designing a news feed
Day 21 design template
Day 21 drills
Day 21 posts
Week 4: async, queues and the log
Day 22: sync vs async, and why queues exist
Day 22 lab results
Day 22 drills
Day 22 posts
Day 23: the log as a primitive
Day 23 lab results
Day 23 drills
Day 23 posts
Day 24: Kafka, partitions and consumer groups
Day 24 lab results
Day 24 drills
Day 24 posts
Day 25: delivery semantics and idempotency
Day 25 lab results
Day 25 drills
Day 25 posts
Day 26: the outbox pattern
Day 26 lab results
Day 26 drills
Day 26 posts
Day 27: backpressure and load shedding
Day 27 lab results
Day 27 drills
Day 27 posts
Day 28: designing a notification system
Day 28 design template
Day 28 drills
Day 28 posts
Week 5: distributed systems
Day 29: failure, time, and the eight fallacies
Day 29 lab results
Day 29 drills
Day 29 posts
Day 30: CAP, for real, and PACELC
Day 30 lab results
Day 30 drills
Day 30 posts
Day 31: replication and quorums
Day 31 lab results
Day 31 drills
Day 31 posts
Day 32: consensus and Raft
Day 32 lab results
Day 32 drills
Day 32 posts
Day 33: logical clocks
Day 33 lab results
Day 33 drills
Day 33 posts
Day 34: the papers
Day 34 paper summaries
Day 34 drills
Day 34 posts
Day 35: designing a distributed key-value store
Day 35 design template
Day 35 drills
Day 35 posts
Week 6: AI systems
Day 36: how LLM inference actually works
Day 36 lab results
Day 36 drills
Day 36 posts
Day 37: the KV cache and continuous batching
Day 37 lab results
Day 37 drills
Day 37 posts
Day 38: vector search and embeddings
Day 38 lab results
Day 38 drills
Day 38 posts
Day 39: RAG, and why it mostly fails at retrieval
Day 39 lab results
Day 39 drills
Day 39 posts
Day 40: agents, and why the token bill explodes
Day 40 lab results
Day 40 drills
Day 40 posts
Day 41: serving concerns, caching, limiting and fallback
Day 41 lab results
Day 41 drills
Day 41 posts
Day 42: designing a production AI chat system
Day 42 design template
Day 42 drills
Day 42 posts
Week 7: production
Day 43: observability
Day 43 lab results
Day 43 drills
Day 43 posts
Day 44: SLOs and error budgets
Day 44 lab results
Day 44 drills
Day 44 posts
Day 45: rate limiting
Day 45 lab results
Day 45 drills
Day 45 posts
Day 46: multi-tenancy and isolation
Day 46 lab results
Day 46 drills
Day 46 posts
Day 47: security boundaries
Day 47 lab results
Day 47 drills
Day 47 posts
Day 48: cost and capacity planning
Day 48 lab results
Day 48 drills
Day 48 posts
Day 49: designing a multi-tenant SaaS
Day 49 design template
Day 49 drills
Day 49 posts
Week 8: putting it all together
Day 50: the framework
Day 50 framework sheet
Day 50 drills
Day 50 posts
Day 51: mock, a URL shortener
Day 51 mock brief
Day 51 drills
Day 51 posts
Day 52: mock, a chat system
Day 52 mock brief
Day 52 drills
Day 52 posts
Day 53: mock, a rate limiter and a news feed
Day 53 mock briefs
Day 53 drills
Day 53 posts
Day 54: mock, an AI system
Day 54 mock brief
Day 54 drills
Day 54 posts
Day 55: capstone kickoff
Day 55 capstone design doc
Day 55 drills
Day 55 posts
Day 56: capstone build
Day 56 build guide
Day 56 drills
Day 56 posts
Day 57: capstone load test
Day 57 load-test guide
Day 57 drills
Day 57 posts
Day 58: capstone writeup
Day 58 architecture doc
Day 58 drills
Day 58 posts
Day 59: review and gaps
Day 59 review grid
Day 59 drills
Day 59 posts
Day 60: the finish
Day 60 finish
Day 60 drills
Day 60 posts
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