I will do seamless API development and integration for your application

D
donfelix330
D
donfelix330
Don felix
do seamless API development and integration for your application
Full Screen
do seamless API development and integration for your application

About this gig

Are you looking for a skilled API developer to build reliable, secure, and scalable APIs or integrate third-party services into your app? Youre in the right place.

I specialize in REST API development, third-party API integration, and backend automation, ensuring your app communicates smoothly with any platform or service.

Whether youre building a new system or improving an existing one, I deliver clean, well-documented, and production-ready solutions.


What I Offer

Full API Development

  • RESTful API
  • CRUD operations
  • JWT authentication
  • Role-based access control
  • API documentation (Swagger/Postman)

API Integration

  • Payment APIs (PayPal, Stripe, Mpesa, Flutterwave, etc.)
  • Social APIs (Facebook, Instagram, TikTok, YouTube)
  • AI APIs (OpenAI, ChatGPT, Gemini, Claude)
  • SMS & Email APIs (Twilio, SendGrid, etc.)

Backend Development

  • Node.js, Python, PHP, Laravel, Django, Express
  • Database integration (MySQL, PostgreSQL, MongoDB)
  • Webhooks
  • Third-party automation

Fixing & Improving Existing APIs

  • Bug fixes
  • Response optimization
  • Error handling
  • Security enhancement

Why Choose Me?

  • Clean, scalable, and secure code
  • Fast delivery
  • 24/7 communication
  • 100% satisfaction guarantee
  • Beginner-friendly explanations av

  • Expertise

    • Debugging
    • Performance
    • Design
    • Databases
    • Source control

  • Programming language

    • Python

  • Frontend framework

    • Angular
    • AngularJS
    • Bootstrap
    • React.js
    • Vue.js

  • Backend framework

    • Django
    • Express.js
    • FastAPI
    • Next.js
    • Node.js

Get to know Don felix

Don felix

High Quality Software, Websites and UI That Deliver Results

  • FromUnited States
  • Member sinceDec 2025
  • Avg. response time3 hours

  • Languages

    English, French
Hi, I’m Don, a software engineer with 5+ years of experience in web, desktop, and mobile app development. I build reliable, high-performance backend systems and clean, user-friendly frontends. I work with technologies such as Python, Java, C++, C#, JavaScript, SQL, MERN Stack, Flask, Spring Boot, React, HTML, and CSS. I also create professional, responsive WordPress websites and design intuitive UI/UX for all devices. Client satisfaction is my top priority. I focus on understanding your needs, solving real problems, and delivering high-quality work on time and within budget.

Other Software Development Services I Offer

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