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Flutter ZIP-Code Autofill That Just Works

I built ZIP-code autofill into AI US Citizenship Test 2026 , a Flutter app that helps green card holders prepare for the naturalization interview with an AI tutor, realistic N-400 mock interviews, and…

  • ZIP-code autofill speeds up naturalization interview forms
  • Validate input with regex for 5-digit and ZIP+4 formats
  • Debounce API calls every 500ms to prevent wasted requests

My Mermaid renderer taught me that headless Chrome is a 300MB tax on every deploy

I needed flowcharts and sequence diagrams as images inside an agent pipeline — the kind of thing you sketch in Mermaid because nobody wants to draw boxes by hand.

  • Headless Chrome added 300MB to container size, causing slow cold starts and OOM-killed workers
  • Developer replaced headless Chrome with Mermaid endpoint, eliminating browser tax on deployments

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