I will integrate one API or ai feature into your existing web app

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Charles
integrate one API or ai feature into your existing web app
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integrate one API or ai feature into your existing web app

About this gig

Have a working web app that needs one external API or a simple AI-powered request? I will connect one documented endpoint or request flow to your existing code and confirm the expected input and output in a safe test environment.


You will receive the integration source code, one success-path check, one basic failure-path check, and setup notes. Please provide your stack, provider documentation, the existing code boundary, and redacted sample input and output.


This Basic package assumes your app and required authentication method already exist. New backend architecture, complex OAuth, multiple endpoints, data migration, provider fees, and production deployment need a separate scope. Do not send credentials or customer records in Fiverr chat.

  • Programming language

    • TypeScript

Get to know Charles

Charles

Java Backend Developer and AI Application Engineer

  • FromChina
  • Member sinceJul 2024

  • Languages

    Chinese, English
Independent developer in Shenzhen since May 2026, with 20+ years in software development and 10+ years in architecture across banking, insurance, securities and real estate. I work on requirements, DDD, database design, microservices and integrations. Main stack: Java/Spring, React/RN, Next.js, Flutter, Go, Docker/Kubernetes. AI: Dify, LangChain/LangGraph, Claude Code and Codex. Experience includes web apps, APIs, automation and blockchain projects. I independently develop Wenxing, AIStackWatch and Tunehome. Available for remote project work; I prefer written communication.

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