Capital is a private, single-owner finance application that combines connected account data, a manual monthly ledger, recurring analysis, alerts, and digest reporting in one operating interface.
Stack, status, evidence, and public actions are rendered from the typed project record.
Category
Product System
Type
App
Priority
Strong
Overview
What this project is
Capital is a private, single-owner finance application that combines connected account data, a manual monthly ledger, recurring analysis, alerts, and digest reporting in one operating interface.
Problem
Why it matters
Personal financial context is fragmented across institutions, statements, notifications, and separate planning tools, making it difficult to explain what changed and why.
Solution
Approach
A server-first command center that unifies account state, transactions, intentional monthly planning, recurring behavior, historical trends, net worth, and scheduled summaries for one authenticated owner.
Architecture
System shape and stack
Product Model
Explain change, not just balances
The product connects balances and transactions to manual spending intent, recurring patterns, cash-flow trends, net-worth history, and digest reporting so the owner can understand movement across the whole system.
Architecture
Server-first financial operations
Next.js routes and server services coordinate Supabase Auth and Postgres, Plaid synchronization, webhook handling, alert evaluation, Resend email, Web Push, and authenticated Vercel Cron work.
Security Boundary
Narrow owner access
There is no public sign-up. User-facing data is owner-scoped, privileged provider work stays server-side, and Plaid access tokens are encrypted before persistence.
Presentation
Public proof, private product
The public case study contains privacy-reviewed synthetic screenshots and technical documentation. The connected app, source, credentials, and production deployment remain private.
- TypeScript
- Next.js
- Supabase Auth
- Supabase Postgres
- Plaid
- Vercel Cron
- Resend
- Web Push
Technical Highlights
Visible technical signal
- Plaid synchronization with encrypted provider token storage
- Owner-scoped Supabase data model with server-only privileged paths
- Responsive analytics, manual ledger, alerts, and digest workflows
What It Proves
Builder signal
Full-stack product ownership across a high-trust data model, third-party integrations, financial analysis, privacy boundaries, and a distinctive responsive interface.
Boundaries
Context that should stay visible
Capital is personal finance software, not a public banking product or financial institution. The screenshots use fictional synthetic data from an isolated read-only presentation build.