I will develop fintech app, integrate payment gateway apis, payment processor

J
jes_bren
J
jes_bren
Jessy Brien
develop fintech app, integrate payment gateway apis, payment processor
Full Screen
develop fintech app, integrate payment gateway apis, payment processor
Full Screen
develop fintech app, integrate payment gateway apis, payment processordevelop fintech app, integrate payment gateway apis, payment processor

About this gig

Are you looking to build a secure, modern fintech application with reliable payment functionality?


I provide custom fintech development and payment API integration services focused on building reliable, scalable, and maintainable software.


I can help develop and integrate payment functionality into web and mobile applications, including:

  • Payment gateway API integration


  • Payment processor integrations


  • Checkout and payment flows


  • Webhook implementation


  • Payment status and confirmation systems


  • Subscription and recurring-payment functionality


  • Customer payment interfaces


  • Backend APIs for payment-related features


  • Fintech dashboards and admin interfaces


  • Secure database and API architecture


  • Third-party API integrations


  • Testing and troubleshooting of payment integrations


My focus is on building clean, maintainable software that integrates with the payment providers and APIs selected by the client.


I can work with an existing application or help develop the payment-related components as part of a new fintech project.


Please contact me before ordering so we can confirm your requirements, tech stack, and project scope.

  • App type

    • Native

  • Programming language

    • Java
    • JavaScript
    • PHP
    • Python
    • Ruby
    • Swift
    • HTML
    • React Native
    • Flutter
    • Bubble

  • Frameworks

    • Flutter
    • Ionic
    • Laravel
    • SwiftUI
    • Cordova
    • Node.js
    • React Native

  • Purpose

    • Crypto
    • Custom
    • Ecommerce
    • Trading
    • Wallet app

  • Tools

    • Xamarin
    • Flutterflow
    • Expo
    • Android Studio
    • Xcode
    • Passion.io
    • Firebase

  • Expertise

    • Cross browser/Device compatibility
    • Performance
    • Security
    • Design
    • Data storage
    • API integration

Get to know Jessy Brien

Jessy Brien

Jessy

  • FromUnited States
  • Member sinceSep 2026

  • Languages

    English, French
I’m a professional mobile app and website developer. I build around the purpose of the product, the people using it, and the business behind it. Whether you need a customer-facing mobile app, a responsive website, an online platform, a marketplace, a booking system, or a custom business solution, I approach each project with a clear understanding of it's goals and workflow. I can work with you from the early idea stage or continue from an existing design, prototype, or partially developed project. Have an idea in mind? Contact me to turn it to greatness.

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