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ENGINEERING BLOG

Repository Anand P S | | ~8 min read

Real-Time Team Expense and Fund Flow Management System

A full-stack system engineered to simplify shared expense tracking, automate fund distribution, and provide real-time visibility into personal and group financial flows.

  • Full-Stack Development
  • System Design
  • Spring boot
  • React
  • PostgreSQL
  • Real-Time Data Handling
  • Financial Modeling
Mac dashboard view of the personal finance management system
Shared expense dashboard in the finance management system
Create event flow in the finance management system
Participant onboarding screen in the finance management system
Event naming interface for shared finance tracking
Expense claim workflow in the finance management system
Expense event populated with financial transaction data
Overview screen showing grouped event balances and expense summaries
Empty-state screen for a newly created finance event
Event creation flow, participant management, and real-time expense tracking dashboard.
Contributors

Problem Space

Managing shared expenses within a group introduces ambiguity in tracking who paid, who owes, and how settlements should be calculated. Existing solutions either lack transparency or introduce friction in usage.

A system was implemented to provide deterministic tracking of fund flow across individuals while maintaining simplicity in user interaction.

System Concept

The system is built around event-driven financial grouping, where each event represents a shared expense context such as trips, parties, or team activities.

  • Event-based expense isolation
  • Participant-level tracking
  • Real-time balance computation
  • Clear settlement pathways

Core Workflow

The system follows a structured interaction flow:

  • Create event → define context
  • Add participants → build group
  • Log expenses → assign claimant
  • System computes balances → who owes / who gets
  • Settlement execution → close financial loop

Each stage is optimized to reduce cognitive overhead while maintaining accuracy.

Financial clarity is not about tracking more data, but structuring it correctly.

System Architecture

The system is implemented as a full-stack application with clear separation of concerns:

  • Frontend: React (TypeScript) for interactive UI and state-driven rendering
  • Backend: Java 21 (Spring Boot) for API orchestration and business logic
  • Data Layer: PostgreSQL for relational data modeling and transactional integrity

The architecture ensures consistency between user actions and financial state transitions.

Data Modeling

The system models financial interactions at three levels:

  • Event: Context container for expenses
  • Participant: Entity involved in the event
  • Claim: Individual expense entry

Relationships are maintained to ensure accurate computation of balances across all participants.

Computation Logic

The core engine computes:

  • Total expense per event
  • Individual contributions
  • Equal or rule-based distribution
  • Net payable / receivable per user

This enables instant visibility into financial positions without manual calculation.

User Experience Design

The interface is designed for rapid interaction:

  • Minimal steps for event creation
  • Quick participant onboarding
  • Single-action expense claiming
  • Visual indicators for balances

The system minimizes friction while maintaining accuracy in financial tracking.

Real-Time Visibility

The dashboard provides:

  • Total expenses overview
  • Individual payable and receivable values
  • Recent transactions
  • Active event summaries

This ensures that users always operate with up-to-date financial data.

Outcome

A complete financial interaction system was designed, implemented, and validated. The platform enables seamless management of shared expenses while maintaining transparency and computational accuracy.

The system demonstrates capability in full-stack engineering, financial data modeling, and real-time system design with production-oriented constraints.