Zahin Mohammad
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Home11 essays2023 – 2026

Notes on Building

I write to teach: rebuilding fundamental concepts through mental models, one post at a time.

Essays
11
Since
Dec 2023
Latest
Reading time
45 min in all
Featured essayNo. 11 · 1 Nov 2026 · 12 min readThe Tests Know They Are TestsAI is gaining capability faster than we can verify it, and the systems are starting to notice when they are being checked. A software engineer’s case for worry.

(2026)

6 essays
  1. The Tests Know They Are TestsAI · Safety · Engineering12 min read
  2. Know Everything or Know NothingPrivacy · Product design · Architecture3 min read
  3. To Simulate a Place, You Have to Notice ItExperiment · Simulation · three.js3 min read
  4. Put AI Where Checking Is CheapAI · Product design · SaaS3 min read
  5. Never Edit the PastAccounting · Data modeling · SaaS4 min read
  6. Spreadsheets Are Where the Real Requirements LiveSaaS · Data · Product4 min read

(2025)

2 essays
  1. Arguing Against My Own CodeTesting · Engineering · Career3 min read
  2. The Disabled Button Is Not a Security FeatureSecurity · APIs · Laravel3 min read

(2024)

2 essays
  1. A Sleep in a Test Is a Guess About the FutureTesting · Automation · Puppeteer3 min read
  2. Software Has Desire PathsQA · UX · Testing3 min read

(2023)

1 essay
  1. Two Copies of One FactJavaScript · State · Fundamentals4 min read

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