I had 4 hours before an interview. My friend leaked the questions. I built the answer with Claude Code.

Short summary

Engineer had 4 hours to prepare for a B2B email infrastructure interview (SPF/DKIM/DMARC and inbox placement detection) after friend leaked the technical questions. He used Claude Code to build a working email deliverability testing tool with IMAP polling across five providers, real-time mailbox classification, and edge cases for provider quirks (Outlook's Focused tab, Yandex Russian naming, throttling) by lunchtime. Demonstrating the working prototype during the interview impressed the panel enough to send an offer—illustrating how AI development tools compress timescales from days to hours.

• •Used Claude Code to build functional email deliverability testing tool in 4 hours before interview
• •Demonstrated working prototype (IMAP polling, multi-provider classification, edge cases) live during interview
• •Illustrates how AI-assisted development compresses project timescales from days to hours

Generated with AI, which can make mistakes.