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Budget

A personal budgeting and expense tracking application focused on recurring transaction management and financial visibility.

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Overview

The Budget App is a personal finance tracking tool designed to make recurring expenses and income easier to understand and manage. Instead of manually entering every transaction, the system models recurring payments such as rent, subscriptions, and paychecks and automatically generates the appropriate entries each month.

This approach allows users to quickly understand expected spending patterns and monthly financial trends without repetitive manual entry.

The application also provides aggregated insights into income and spending, helping users visualize how their financial behavior changes over time.

The project focuses on correctness and reliability in financial data processing, particularly around recurring transaction generation and ensuring transactions are never duplicated even under concurrent execution scenarios.

Screenshots

System Architecture

The backend is designed around a simple and reliable transaction model. Recurring transactions are stored separately from generated transactions and processed once per month using an idempotent backend job.

To prevent race conditions or duplicate transaction creation, the system uses transactional database operations and conflict-safe insertion strategies. This ensures financial records remain consistent even if the recurring processing job runs multiple times or fails mid-execution.

The frontend communicates with a lightweight API to retrieve transaction data, aggregated totals, and financial summaries.

Technical Details