Articles

Practical guides, in-depth technical pieces, and lessons from real projects.

All engineering (6) scalability (6) amazon (1) blackfriday (1) reliability (1) discord (1) messaging (1) meta (1) whatsapp (1) java (1) netflix (1) uber (1) system-design (1) payments (1) low-latency (1)

7/9/2026 Knowledge Café

The 200-Millisecond Yes: Designing a Card Authorization System That Survives Black Friday

A principal engineer's blueprint for an issuer authorization system — meeting a strict sub-200ms latency budget with layered caching, disciplined connection pooling, and a ledger design that doesn't melt under hot-spot writes at peak.

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6/24/2026 Uber Engineering

How Does Uber Find a Driver in 3 Seconds When You Request a Ride?

A deep dive into H3 Spatial Indexing, the Thundering Herd problem, and gossip protocols — the real machinery behind ride matching.

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6/14/2026 Netflix Engineering

Behind the “Play” Button: How Netflix Powers 270 Million Homes with Modern Java

A deep dive into Netflix's high-performance Java ecosystem, featuring JDK 21, Virtual Threads, Federated GraphQL, and the architectural strategies that power 270 million subscribers.

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5/15/2026 Discord Engineering

How Discord Stores Billions of Messages Without Going Broke?

A story about outgrowing your database, tombstones that refuse to die, and why 'deleting' data can make your system slower.

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5/8/2026 Amazon Engineering

The Anatomy of a Black Friday Flash Sale

How Amazon Prevents Overselling the Last Item

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5/1/2026 Meta Engineering

How 50 Engineers Scaled WhatsApp to 2 Billion?

How a tiny engineering team managed a user base larger than the population of most continents while writing surprisingly little code.

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