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51TCP, HTTP, TLS, DNS & more
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38Consensus, replication & more
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84Kernel, networking & system calls
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24Quick reference cards for interviews
Recent Posts
System Design: GitHub (200M Repos, Git Object Storage, Sparse Trigram Code Search, Per-Job VM CI)
System Design
Apr 23, 2026 · 69 min
System Design: Online Auction (50K Bids/sec, Effectively-Once Settlement, Anti-Sniping)
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Apr 17, 2026 · 83 min
System Design: Job Scheduler (10M Jobs/day, DAG Dependencies, Effectively-Once Execution)
System Design
Apr 15, 2026 · 61 min
Leadership
DirectorMigration Program Management
“The last 20% of any migration contains 80% of the pain. Budget and staff for it explicitly, or it will drag on for years as a zombie project”
Org Design
EnterpriseChapters & Guilds
“Spotify itself has said the 2012 whitepaper was aspirational, not descriptive. Jeremiah Lee, a former Spotify engineer, wrote a widely-cited critique in 2020 confirming the model never fully worked as described. Treat the vocabulary as useful shorthand, not a blueprint”
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Discover Today
TiDB
MySQL-compatible distributed database that actually handles both OLTP and OLAP
GitOps & Infrastructure as Code
Git as the single source of truth for both application and infrastructure config
MinHash & Locality-Sensitive Hashing
MinHash estimates the Jaccard similarity between two sets without comparing them element by element. Two documents with 80% word overlap will have matching MinHash values about 80% of the time. This turns a potentially expensive set intersection into a fast signature comparison