WRITING — FIELD NOTES

Notes from the field, filed in order.

Field notes on systems, learning, uncertainty, and the useful wrong turn.

9 ENTRIES · 2025—26

NO.DATEFIELDTITLEREAD

N-001JUL 2026QUANTTestAgainThis is a test5 MIN N-002JUN 2026SYSTEMSWhy MongoDB find() Returns a CursorLazy iteration, batching, and what the driver actually sends over the wire.6 MIN N-003MAY 2026AI PRODUCTSDesigning an AI Tutor Around User SituationsMaking the learner’s situation the first-class object instead of the chat log.9 MIN N-004APR 2026QUANTVolatility-Managed Equity ExposureScaling exposure by realized volatility, tested against three decades of data.12 MIN N-005MAR 2026SYSTEMSWhat External Sorting Actually DoesRuns, merges, and why the memory hierarchy sets the shape of the algorithm.7 MIN N-006FEB 2026ENGINEERINGBuilding a Trading API Sandbox SafelyRisk limits, simulated fills, and letting strategies fail without consequence.8 MIN N-007JAN 2026EDUCATIONTeaching Rotational Dynamics Without the PanicUnfamiliar diagrams, error taxonomies, and a drill structure that transfers.10 MIN N-008DEC 2025ENGINEERINGBackpressure in WebSocket Market FeedsWhat to drop, what to buffer, and how a slow consumer should degrade.7 MIN N-009NOV 2025AI PRODUCTSSpaced Repetition Is a Scheduling ProblemReview queues as priority scheduling, and what tutors can borrow from kernels.8 MIN

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