Money

• Closed the demo-to-production loop in roughly 24 hours elapsed time.
• Created a verifiable, exportable, recoverable private ledger used as a real service.

• Used Worker + D1 as the source of truth and IndexedDB as the local read layer.
• Stopped expanding scope and prioritized real loading and history-navigation friction.

• 15 staged commits plus architecture, verification, and backup documentation.
• Production site, mobile screenshots, and automated release gates.

• Owner / Product Engineer across product, design, frontend, backend, data migration, and release.

• Turn years of private bookkeeping data into a trustworthy, low-friction, maintainable personal product.

• Financial data must remain private.
• Mobile experience comes first while maintaining one Web/PWA codebase.

Years of personal finance data should not remain trapped in a closed tool. This project turns that history into an owned system that stays private, exportable, recoverable, and open to continuous product improvement.

• Record an expense quickly on mobile and confirm it in the daily ledger.
• Review year, month, and week trends, then drill into categories, dates, and transactions.
• Search all historical notes, subcategories, and categories by keyword.
• Organize categories, export data, and manage the private account on desktop.

• Moved from visual demo to production private PWA across roughly 24 hours elapsed time and 15 staged commits.
• Shipped authentication, database-backed CRUD, category management, export, search, PWA behavior, and a production domain.
• Added 14 automated tests plus type, build, and leak-scan release gates.
• The AI collaboration log recorded about 139.8M tokens, roughly 96.5% cached long-thread context; the $125.83 flat-rate estimate is not an actual provider bill.

• A monochrome workbench keeps yellow reserved for recording, selection, and sync feedback.
• The taxonomy was rebuilt into 12 spending domains with one stable home for each concrete item.
• Recording is a global mobile action while desktop emphasizes analysis, search, and management.
• Large loading states were replaced by in-place progress and quiet skeletons so content remains primary.

• React, TypeScript, and Vite power the responsive PWA; Cloudflare Worker and D1 provide authentication and relational storage.
• IndexedDB stale-while-revalidate keeps ledger, analytics, search, and category details immediately available locally.
• Stable cursor pagination progressively traverses full history and search results; integer cents and idempotency protect writes.
• A same-origin Vercel proxy connects the Worker API, with migrations, backup, restore, and production smoke checks.

• The live product remains behind a private login with no public registration.
• Portfolio imagery uses synthetic data and never exposes real financial records.
• The public case study focuses on product judgment and architecture without account or infrastructure details.