Developer builds Markdown resume editor to streamline AI-generated resume workflows

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A developer created ResumeMD, a split-pane Markdown resume editor designed to eliminate the manual reformatting required when pasting AI-generated resume content into traditional builders. The tool lets users paste Markdown on the left, preview a formatted resume on the right, choose from 32 templates, and export a PDF — all without an account. By default, all data is stored locally in the browser via localStorage, with optional cloud sync available for signed-in users. Building the tool surfaced notable technical challenges, including a stale closure bug in Supabase real-time subscriptions that caused the sync layer to misidentify a user's own updates as conflicting changes. A second race condition on first sign-in could trigger duplicate database row creation, highlighting the complexity of offline-first architectures with optional cloud layers.

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