When Your Auditor Writes Numbers in English
Number words are the kind of data no one notices until they break the pipeline.…
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The R-Squared Trap: Why Your Best-Fit Line Can Quietly Lie to You
A high R-squared feels like a verdict. The number comes back at 0.92, the slope…
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IBAN & SWIFT Validator: four checks, one verifier
Cross-border payments need a four-step validator: strip whitespace, check length against country, run mod-97 for IBANs, and verify the 8 or 11 character SWIFT/BIC structure. Here is the exact recipe and the five traps that break it in production.
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The QR Code Is Not the Whole 2FA Setup
A practical guide to comparing TOTP and HOTP codes by making the shared secret, HMAC algorithm, counter, digits, and time window explicit.
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Before You Delete an Outlier: A 6-Question Data Cleaning Protocol
A practical protocol for detecting, marking, and processing extreme values without deleting useful evidence.
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Reading What’s Already There: A Field Guide to PDF Annotation Export
A field guide to lifting reviewer markup — highlights, sticky notes, stamps, links — out of a PDF and into structured JSON your scripts can use. Walks nine subtypes, seven extracted fields, and three workflow patterns.
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The Phone Number Is Not a String: A Global Validator Field Guide
A practical field guide to country context, canonical output, readable formatting, and the failure modes that make phone validation look easier than it is.
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XML to JSON Converter: five dials, eight questions, one conversion
A mental model for the five dials the XML to JSON converter actually exposes — pretty print, attributes, namespaces, single-element arrays, and the implicit mixed-content corner — plus the eight-question check that catches every silent loss of fidelity before you trust the output.
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Rotate Secrets Before They Become Incidents
A practical four-week plan for turning a messy .env file into an owned, staged, and reversible credential lifecycle.
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Basketball Stats Calculator: Three Formulas, One Career, Zero Magic
Box scores lie. eFG%, TS%, and PER redraw the comparison — three formulas, one calculator, and the interpretation work the spreadsheet skips.