Write-ups from real work.
Short, technical and honest: how things were built, what was measured, and what the factory floor keeps teaching me about software. Every claim links to public code or gets called an estimate.
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Reconstructing the NASDAQ book: ITCH 5.0 decode and a lock-free SPSC pipeline
Safe big-endian decoding instead of struct casts, BinaryFILE vs MoldUDP64 with gap detection, a price-level store chosen by a measured A/B, and a wait-free ring verified with ThreadSanitizer - plus the browser L2 viewer that renders the result.
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An open OEE engine: building ShopFloor API next to a production MES
The production system is private, so the domain got rebuilt in the open: a pure OEE calculator with the divide-by-zero and over-speed cases handled, compute-at-close instead of cron, Flyway with Hibernate validate, and Testcontainers against real PostgreSQL.
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What running Krones lines taught me about writing operations software
Design for the 6 a.m. handover, beat paper before you beat Excel, ask for less data and get better data, treat the report as the product, and measure honestly - from someone who runs the lines and writes the software.
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