I will integrate apis to your web application

B
barnetvilem
B
barnetvilem
Vilém Barnet

About this gig

Professional API Integration for Web Applications

I provide reliable API integration services to connect your application with the tools, data, and features it needs. From payment gateways to AI services, I ensure your APIs are set up securely, work efficiently, and are easy to maintain.


What I Deliver

  • REST API integration
  • Third-party APIs (Stripe, PayPal, Google, OpenAI, etc.)
  • Authentication and API key management
  • Webhooks and event-driven automation
  • Error handling and performance optimization
  • Documentation for future maintenance


Why Work With Me

  • Full-stack development experience (React, Next.js, Node.js, Express, FastAPI, MongoDB, Supabase)
  • Focus on clean, maintainable, and secure code
  • Clear communication and regular progress updates
  • Flexible solutions that can scale with your project


Whether you need to add a single API to an existing app or build a complex workflow that connects multiple services, I can help you plan and implement the right solution.

Get to know Vilém Barnet

Vilém Barnet
  • FromCzech Republic
  • Member sinceAug 2025
  • Languages

    English, Czech, Spanish, Korean, Indonesian, Greek
Full-stack developer & AI engineer with a design background, creating modern, AI-powered web applications that are both high-performing and visually polished. I work with React (NextJS) and TypeScript on the frontend, and Python with FastAPI or NodeJS with Express on the backend. My AI expertise includes building RAG pipelines, developing AI agents with LangChain and LangGraph, and delivering custom LLM-driven solutions tailored to client needs.

My Portfolio

Other Software Development Services I Offer