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Satyajit Samal

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PayFlow - Full-Stack Payment Application

PayFlow is a full-stack MERN application built for practical digital payment workflows: user auth, account linking, secure transfer operations, searchable account discovery, and transaction tracking through a user dashboard.

PayFlow - Full-Stack Payment Application desktop preview
PayFlow - Full-Stack Payment Application mobile preview
React (Vite)Node.jsExpressMongoDB AtlasJWTREST API

Problem

Payment-style workflows often split auth, account data, and transfer operations across disconnected screens and weak API boundaries, making trust and usability difficult.

Solution

Built a role-consistent product flow with protected APIs, JWT-based auth sessions, account lifecycle handling, transfer operations, and history visibility in a single dashboard-driven experience.

Key Features

  • - JWT-based sign up/sign in flow
  • - Create and manage multiple bank accounts
  • - Account search by account number, IFSC, or user name
  • - Transfer funds between accounts with protected transaction routes
  • - Transaction history view with activity traceability
  • - Dashboard with profile, balances, and recent activity

Architecture Notes

  • - Client-server split with React frontend and Express backend
  • - JWT-protected API routes for non-auth operations
  • - Account and transaction modules with request validation and secure flow boundaries
  • - Dashboard aggregation pattern for profile, balances, and recent activity

Product Context

PayFlow is built as a practical full-stack payment workflow product where users can sign in, create accounts, move funds, and track activity from one dashboard.
The focus is not only UI flow, but reliable backend boundaries for account and transaction operations.

What I Built

  • JWT-based sign-up and sign-in flow with protected access for non-auth APIs.
  • Account management actions for creating and handling multiple bank accounts.
  • Search flow for account lookup by account number, IFSC, or user name.
  • Transaction flow for transferring funds and reviewing transaction history.
  • Dashboard layer for profile details, balances, and recent activity.

API and Security Design

The API layer is organized around auth, account, transaction, and user modules.
Auth is token-based (JWT), and operational routes are protected through authorization checks so account and transfer actions are not exposed publicly.
The API design keeps each workflow scoped and explicit, which makes frontend integration and debugging easier.

Transaction Workflow

Fund transfer logic is wired through protected transaction endpoints with clear request payload structure.
The flow links sender context, receiver account details, amount input, and transaction records so users can see both action results and history continuity in the dashboard.

Why This Project Matters

PayFlow is strong portfolio evidence for full-stack execution because it combines:

  • authentication and protected route handling,
  • account lifecycle logic,
  • transactional API operations,
  • search-first data retrieval,
  • and dashboard-oriented product presentation.

It demonstrates practical system composition beyond static CRUD pages.

What I Would Improve Next

  • Add idempotency and transfer-safety guardrails for repeated submit prevention.
  • Introduce stronger server-side validation and standardized error contracts for each financial action.
  • Expand observability around transaction states to improve support and debugging workflows.

Lessons Learned

  • - Protected API boundaries are as important as UI clarity in payment-style products.
  • - Transaction flows need explicit validation and failure-safe messaging to preserve user trust.

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