I will build or fix API integrations for payments or authentication with node and java

M
michaelrod_uy
M
michaelrod_uy
Michael
build or fix API integrations for payments or authentication with node and java
Full Screen
build or fix API integrations for payments or authentication with node and java

About this gig

If you need to integrate payments, authentication or external APIs into your system, I can build clean and reliable backend endpoints.

I work with Node.js, Express and Java for small, focused API tasks.

I can help with:

  • Payment integrations (Mercado Pago, Stripe, PayPal)
  • Webhooks setup and troubleshooting
  • OAuth / JWT authentication
  • API endpoints (CRUD, services, utilities)
  • Server-to-server integrations
  • Fixing broken or unstable APIs
  • Backend debugging

All integrations include proper error handling and best practices.

  • Expertise

    • Algorithms & Data structures
    • Performance
    • Security
    • Design
    • Source control

  • Programming language

    • Java

  • Frontend framework

    • React.js

  • Backend framework

    • Spring

Get to know Michael

Michael

Full Stack Developer, Java, React, PostgreSQL, n8n

  • FromUruguay
  • Member sinceNov 2025
  • Avg. response time11 hours

  • Languages

    Spanish, English
Full Stack Developer con +10 años creando soluciones para pymes y organizaciones. Desarrollé un sistema empresarial que lleva 10 años en producción y actualmente evolucionó su versión CRM/ERP. También mantengo un sistema de membresías con 8 años de uso continuo, hoy en React/Next. Trabajo con Java/Spring Boot, React, PostgreSQL, Docker, AWS y Keycloak. Me enfoco en software estable, claro y orientado al negocio. Disponible para proyectos remotos.

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