Fintech

Banking, OTP & Settlement Integration

Senior .NET Developer

This project is relevant for clients who need secure, integration-heavy backend systems.

Overview

This project involved backend work for jeweler tablet, back-office, and bank-settlement workflows on a .NET Framework 4.7.2 stack.

The system supported secure user flows, customer onboarding, OTP verification, gold purchase operations, file uploads, bank integrations, token refresh, email dispatch, and audit-ready request/response logging.

What The Platform Needed

The platform needed to connect several operational surfaces:

The main challenge was building integration workflows that remained traceable and supportable when banking APIs, SMS flows, user sessions, and back-office operations all interacted.

  • Tablet users and jeweler branch workflows
  • Back-office operator workflows
  • Customer onboarding and verification
  • SMS OTP authentication and approval flows
  • Bank account and settlement integrations
  • REST/SOAP service communication
  • File uploads and transaction documents
  • Background token refresh and queued email delivery
  • SQL Server-backed audit and reporting data

My Backend Work

I worked on .NET Framework APIs and MVC surfaces using EF6 database-first over SQL Server. The project used JWT, SMS OTP, REST/SOAP integrations, Windows services, Exchange email dispatch, and request/response logging.

Key work included:

  • OTP-gated login and approval workflows
  • JWT issuance and validation through custom handlers
  • REST and SOAP integrations with banks and supporting services
  • SQL Server persistence using EF6 database-first patterns
  • Request/response traffic logging for auditability
  • Windows services for bank token refresh
  • Queued email dispatch through Exchange
  • File upload handling and metadata persistence
  • Reusable HTTP/SOAP helper code

Technical Highlights

  • Backend stack: .NET Framework, ASP.NET MVC/Web API, EF6, SQL Server
  • Security: JWT authentication, SMS OTP, identity checks
  • Integrations: bank REST/SOAP APIs, SMS providers, Exchange email
  • Operations: token refresh services, request/response audit logging
  • Data: DB-first EF models, transaction and file metadata persistence

Why This Project Is Relevant

This project is relevant for clients who need secure, integration-heavy backend systems.

It is useful for clients who need:

It shows experience with practical production integration work where security, traceability, and supportability are as important as the API calls themselves.

  • Fintech or banking integrations
  • Legacy .NET Framework support
  • SQL Server-backed workflows
  • OTP and authentication flows
  • REST/SOAP API integration
  • Windows Services
  • Audit logging
  • Back-office operational systems
  • Reliability around external services

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