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I will fix login errors or integrate oauth authentication fast
Carlo Gammarota
About this gig
Having issues with Google OAuth? Redirect errors? Invalid client? Production verification problems?
I will fix or implement Google login authentication for your web or mobile app.
I have implemented OAuth systems in production platforms handling real users and payments.
I can help you with:
Google OAuth 2.0 setup
Consent screen configuration
Redirect URI errors
JWT token validation
Backend authentication (Node.js, NestJS, Express)
Vue / React frontend integration
Android & iOS integration
Fix production verification issues
Fast delivery. Clean implementation. Secure architecture.
Message me before ordering.
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Get to know Carlo Gammarota
Carlo Gammarota
SaaS Architect and Authentication Specialist
- FromArgentina
- Member sinceFeb 2012
- Avg. response time2 hours
Languages
Spanish, English
Senior Full Stack Software Engineer with 15+ years of experience building scalable web and mobile applications. Specialized in SaaS architecture, OAuth authentication, secure backend systems and cloud deployment. I build production-ready solutions focused on performance, security and long-term growth.
My Portfolio
FAQ
❓Do I need a Google Cloud account?
Yes. You must provide access to your Google Cloud Console or share project credentials so I can configure OAuth properly.
❓Can you fix redirect URI mismatch errors?
Yes. This is one of the most common OAuth issues. I will configure authorized redirect URIs correctly and fix production mismatches.
❓Do you support backend frameworks?
Yes. I work with Node.js, NestJS and Express. If you use another backend, message me first to confirm compatibility.
❓Is the implementation secure?
Yes. I implement proper token validation, secure JWT handling and production-ready configuration.
❓ Do you deploy to production?
Deployment is available as an extra service. I can help you deploy to VPS, AWS or Vercel.
What do you need from me to start?
Access to your project repository, hosting details and Google Cloud Console. Clear project requirements will speed up delivery.
