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synthesis

5 cards

Cards

A ledger of ten trades from a hundred days of cards — availability bought with consistency, speed with freshness, independence with duplication — set beside gold casino chips and a fountain pen

FoundationsDay 100Nov 10, 2026

Now We Can Name Them

system-design trade-offs foundations

Four questions to answer before drawing a system — what is this for, what must never be wrong, what happens when it breaks, what are we accepting — each with the specific sub-questions that make it answerable

Design ThinkingDay 99Nov 9, 2026

The Questions Before The Diagram

system-design architecture design-thinking

Five earlier cards — thread pools, connection pools, load shedding, hot partitions and backpressure — showing the queue relocating each time capacity is added, and a chain of stages where widening the constraint immediately creates another

PerformanceDay 98Nov 8, 2026

The Bottleneck Moves. It Never Leaves.

system-design performance scalability

Four caches from earlier days — the shopping cart, a catalogue cached at the ISP, stale-while-revalidate and semantic caching — each written out as the bet it makes, with a reality check on freshness traded for latency, load, cost or experience

CachingDay 97Nov 7, 2026

Every Cache Is A Bet On Staleness

system-design caching architecture

Write skew, a double charge, a vanishing comment and an expired lock set out as four failures with one shape — observe, a time gap in which the world changes, then act — and three fixes that rhyme

Distributed SystemsDay 96Nov 6, 2026

Every Distributed Bug Is A Time Bug

system-design distributed-systems consistency

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