The Problem
The client required a secure web platform to digitally manage customer onboarding, account management, verification processes, administrative workflows, and financial record management. Existing manual processes reduced efficiency and made it difficult to manage users from a centralized system.
The Solution
Designed and developed a secure full-stack financial management platform featuring authentication, KYC verification, account management, transaction workflows, administrative controls, email notifications, and a scalable REST API, allowing administrators to efficiently manage platform operations through a centralized dashboard.
Overview
Project Overview
A secure financial management platform built with Next.js and FastAPI, providing customer account management, administrative tools, verification workflows, and secure transaction processing through a modern web application.
System Design
System Architecture
Frontend
Backend
Database
Deployment
Security
Security
Authentication Flow
User creates an account.
Verification OTP is sent to the user's email.
User verifies the OTP to activate the account.
Password is securely hashed using bcrypt.
JWT access token is generated after login.
Authenticated session begins.
Inactive sessions automatically expire after the configured timeout.
Protected routes validate JWT on every request.
Rate limiting protects authentication endpoints from abuse.
Forgot Password sends a secure OTP.
User resets password after OTP verification.
Role-based access controls user and admin dashboards.
Request Lifecycle
API Request Flow
User submits a request from the frontend.
FastAPI validates incoming data.
JWT authentication verifies user identity.
Business logic executes requested operation.
Redis caches frequently accessed data when applicable.
PostgreSQL stores or retrieves data.
Email notifications are sent for important actions.
API returns a structured JSON response.
Data Layer
Database Design
Users
- id
- full_name
- password_hash
- role
- is_verified
- created_at
OTP Verifications
- id
- user_id
- otp_code
- purpose
- expires_at
- verified
KYC Records
- id
- user_id
- document_type
- document_url
- status
- submitted_at
Accounts
- id
- user_id
- balance
- status
Transactions
- id
- account_id
- type
- amount
- status
- created_at
Deposits
- id
- user_id
- amount
- proof_image
- status
- created_at
Withdrawals
- id
- user_id
- amount
- wallet_details
- status
- created_at
Administrators
- id
- password_hash
- role
System Settings
- id
- key
- value
Capabilities
Key Features
User Authentication
Secure registration, login, and JWT authentication.
Email OTP Verification
Account verification and password recovery using one-time passwords.
KYC Verification
Identity verification workflow before accessing platform services.
Customer Dashboard
Manage profile, account activities, and financial records.
Rate Limiting
Protects authentication and API endpoints from excessive requests and brute-force attacks.
Session Timeout
Automatically expires inactive user sessions for enhanced account security.
Deposit Requests
Submit payment proofs for administrator review.
Withdrawal Requests
Request withdrawals through a secure approval workflow.
Admin Dashboard
Manage users, KYC requests, deposits, withdrawals, and platform settings.
Analytics
Monitor platform activity and operational metrics.
Under The Hood
Engineering Challenges
Challenge
Secure User Authentication
Resolution
Implemented JWT authentication with encrypted passwords and protected API endpoints.
Challenge
OTP Verification Workflow
Resolution
Built an email-based OTP system for account activation and password recovery.
Challenge
KYC Approval Process
Resolution
Designed an administrator review workflow for identity verification before users could access protected financial features.
Challenge
Protecting Authentication Endpoints
Resolution
Implemented rate limiting to reduce brute-force login attempts and prevent API abuse.
Challenge
Session Security
Resolution
Configured automatic session expiration for inactive users, reducing the risk of unauthorized account access on shared devices.
Challenge
Financial Approval Workflows
Resolution
Implemented separate administrator approval processes for deposits and withdrawals while maintaining auditability.
Challenge
Performance Optimization
Resolution
Integrated Redis caching to reduce repeated database queries and improve response times.
Decision Record
Technical Decisions
Chose
FastAPI
Over
Express.js
Why
Selected for asynchronous performance, automatic API documentation, and excellent Python ecosystem support.
Chose
Next.js
Over
React + Vite
Why
Improved SEO, routing, and production optimization.
Chose
PostgreSQL
Over
MongoDB
Why
Relational data was better suited for structured financial records.
Chose
Rate Limiting
Why
Implemented request throttling on authentication and sensitive API endpoints to improve security against automated attacks.
Chose
Session Timeout
Why
Automatically invalidated inactive sessions to strengthen account security and reduce unauthorized access risks.
Chose
Redis
Why
Used to cache frequently accessed data and improve API response times.
Retrospective
Lessons Learned
- 01
Financial applications require strong authentication and authorization.
- 02
Separating business logic from API routes improves scalability.
- 03
Redis significantly improves performance for frequently accessed resources.
- 04
Role-based access control is essential for administrative systems.
- 05
Well-designed REST APIs simplify frontend integration.
Visual Tour
Screenshots
🌍 Live Project
Documentation
Case Study
Read the complete case study documentation below.
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By The Numbers
Project Statistics
Full Stack
Project Type
FastAPI
Backend
Next.js
Frontend
PostgreSQL
Database
OTP + JWT + Rate Limiting
Security
Auto Timeout
Sessions
JWT
Authentication
Redis
Cache