How to vibe codeKeeper

Prerequisites

• Node.jsFree

  Required runtime for the full-stack web application.

• GitHubFree

  Source control and deployment pipeline integration.

• 

  Plaid Developer AccountFree (Development tier)

  Required to test bank account linking and transaction feeds.

AI coding tools

• Claude Code

  Best-in-class agentic CLI tool for scaffolding full-stack CRUD apps, setting up database schemas, and writing complex classification pipelines.

• 

  Cursor

  Ideal AI editor for reviewing UI components, fine-tuning Tailwind layouts, and editing API routes.

Build guide

1. 01Project Scaffolding and Database Schema

   Initialize the Next.js project with TypeScript, Tailwind CSS, and configure Turso with better-auth and Drizzle ORM.

   Scavenge a brand new Next.js 16 project with TypeScript and Tailwind CSS v4. Set up Drizzle ORM connected to a Turso SQLite database. Implement better-auth with email/password authentication and create tables for users, bank_accounts, transactions, and expense_categories. Ensure the database schema includes fields for merchant name, amount, date, user-assigned tax category, and boolean flags for business write-offs. Provide clean migration scripts and verify everything compiles locally without errors.

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2. 02Plaid Bank Integration Link

   Integrate Plaid Link to allow users to securely connect bank accounts and fetch transaction feeds.

   Implement Plaid API integration in Next.js API routes. Create an endpoint to generate a Plaid link_token, a callback endpoint to exchange the public_token for an access_token, and a background sync route that calls Plaid's /transactions/get endpoint. Store the retrieved items and transactions securely in the Turso database. Build a React component on the frontend using Plaid Link SDK that lets a user connect their sandbox bank account and view their raw transaction feed in a clean data table.

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3. 03AI Transaction Classification Pipeline

   Build an AI-powered classification engine using the Vercel AI SDK and Anthropic API to parse raw merchant strings and suggest IRS deductions.

   Build an automated transaction classification service using the Vercel AI SDK and Anthropic API. When new transactions are fetched from Plaid, pass the truncated merchant strings and amounts to Claude Sonnet with a structured system prompt containing common IRS Schedule C business deduction categories (e.g., Software, Advertising, Travel, Meals). Have the model return a JSON array classifying each transaction with a suggested category, a confidence score, and a brief justification for why it might be a business write-off. Display these AI insights directly in the transaction review dashboard.

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4. 04Deduction Tracker and Dashboard

   Create a comprehensive tax dashboard summarizing total potential write-offs, monthly spending trends, and category breakdowns.

   Build a responsive tax dashboard in Next.js using Tailwind CSS. The dashboard must include summary metric cards showing total year-to-date business deductions, total untracked expenses, and estimated tax savings based on a configurable self-employment tax rate. Include interactive charts or categorized lists allowing users to toggle transactions between 'Personal' and 'Business', bulk-update categories, and add custom notes or upload receipt images linked to specific line items.

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5. 05Quarterly Tax Estimator and Export

   Implement a quarterly tax calculator (1040-ES) and a CSV/PDF export tool for tax preparation.

   Create a quarterly tax estimation tool and export utility page. The calculator should take net business income from the categorized transactions, factor in estimated self-employment tax (15.3% on 92.35% of net earnings) and federal income tax brackets, and generate quarterly payment vouchers for Q1-Q4. Additionally, build an export button that compiles all verified business write-offs into a formatted CSV and a clean printable summary report matching IRS Schedule C line items for personal tax filing preparation.

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Cost vs paying for Keeper