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API Integration / Development

$9/hr Starting at $100

help teams design, build, and integrate backend systems that reliably move data between applications and services.


This service focuses on API development, third-party integrations, backend logic, and data flows that support web and mobile applications. Typical work includes building REST APIs, integrating external platforms, implementing authentication and authorization, handling background jobs, and improving reliability and performance on the server side.


I work with existing systems as well as new backend components, prioritizing clarity, maintainability, and predictable behavior in production. Communication is practical and technical when needed, with an emphasis on getting integrations working correctly and keeping systems stable.


This service is a good fit if you need to connect systems, extend backend functionality, or clean up brittle integrations that are causing issues. For broader product builds or architecture planning, I recommend starting with an application audit or full development engagement.

About

$9/hr Ongoing

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help teams design, build, and integrate backend systems that reliably move data between applications and services.


This service focuses on API development, third-party integrations, backend logic, and data flows that support web and mobile applications. Typical work includes building REST APIs, integrating external platforms, implementing authentication and authorization, handling background jobs, and improving reliability and performance on the server side.


I work with existing systems as well as new backend components, prioritizing clarity, maintainability, and predictable behavior in production. Communication is practical and technical when needed, with an emphasis on getting integrations working correctly and keeping systems stable.


This service is a good fit if you need to connect systems, extend backend functionality, or clean up brittle integrations that are causing issues. For broader product builds or architecture planning, I recommend starting with an application audit or full development engagement.

Skills & Expertise

AmazonAPI DevelopmentApp DevelopmentBack End DevelopmentDrupalE CommerceJavaScriptLaravelPHPReactJSShopifySquarespaceWebflowWooCommerceWordPress

53 Reviews

  • Jens 10 says,

    We have been working on a project for quite a while. We had to take some of it step by step, but I am pleased that we are getting closer to what I want.

    for Excel to online based data entry and rep on Jul 26, 2025

  • Jens 10 says,

    Part payment. Everything is going to plan. Good work.

    for Excel to online based data entry and rep on Jun 18, 2025

  • Volker 2 says,

    Excellent, as always!

    for Stripe integration into custom website on Dec 03, 2024

  • Volker 2 says,

    This project involved updating the online payment functionality of a website which has been continuously online for the past 19 years. The first online payment functionality were "PayPal Payment Buttons" to which "Stripe Card payments" were added when Stripe only supported credit/debit cards over 5 years ago. Arcmax now implemented Stripe v3 payments which include a PayPal option. While this is tricky (Stripe needs adjustments for additional payment options), he sorted it out and implemented that newer payment gate on three websites. This included another option where a string of up to 450 characters has to be transmitted to Stripe in order to process that information and make it available in email messages to both seller and buyer. This is now also working perfectly.

    for Stripe integration into custom website on May 17, 2024

  • Bill-Gowanloch says,

    Been great to work with, highly recommend.

    for IT Coder and Developer on May 02, 2022

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