I will fix, optimize and debug backend apis for saas, ai apps and mobile apps

V
victormandalin
V
victormandalin
Victor M
fix, optimize and debug backend apis for saas, ai apps and mobile apps
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fix, optimize and debug backend apis for saas, ai apps and mobile apps
Full Screen
fix, optimize and debug backend apis for saas, ai apps and mobile appsfix, optimize and debug backend apis for saas, ai apps and mobile apps

About this gig

Hello there,


Broken APIs, slow backend performance, or failed integrations can stop your entire product.


I help founders and businesses fix, debug, and optimize backend APIs for AI apps, SaaS platforms, and mobile applications quickly and professionally.


Whether your backend is crashing, returning errors, running slow, or failing during integrations, I will identify the issue and apply clean, scalable fixes instead of temporary patches.


Backend Technologies I Fix and Optimize:

  • Node.js (Express / NestJS)
  • Python (FastAPI / Django)
  • REST and GraphQL APIs
  • PostgreSQL, MySQL, MongoDB
  • Firebase and Supabase
  • Authentication (JWT, OAuth)
  • Stripe and payment APIs
  • OpenAI / AI API integrations
  • Third-party APIs and webhooks


Common issues I fix:

  1. API errors and crashes
  2. Slow response times
  3. Authentication bugs
  4. Database performance issues
  5. Broken webhooks and integrations
  6. Deployment and environment errors


You will get clear fixes, clean code, and explanations so your backend runs smoothly again.


Message me with the issue details before ordering for a quick assessment.

  • Type

    • Bug fixes
    • API integration
    • Authentication
    • Database integration
    • Performance optimization

  • Vibe coding platform

    • Base44

  • Target device

    • Website
    • Cross-platform app (Mobile, Desktop, Web)
    • Native mobile app

  • Database type

    • Supabase
    • Firebase (Firestore / Realtime DB)
    • AWS (DynamoDB, Aurora, RDS)
    • MongoDB Atlas
    • Google Cloud Firestore / Cloud SQL
    • Microsoft Azure Cosmos DB / SQL Database
    • PostgreSQL

Get to know Victor M

Victor M

Secure and Scalable Backend Development, API Fixes and Long Term Maintenance

  • FromUnited Kingdom
  • Member sinceJan 2026

  • Languages

    English
I am Victor, an expert backend developer for web apps, mobile apps, and AI SaaS platforms, delivering secure, scalable, and high performance backend solutions. I build, fix, and maintain backends using Python, Node.js, Django, FastAPI, Flask, Express, REST and GraphQL APIs, PostgreSQL, MySQL, MongoDB, AWS, Docker, JWT and OAuth authentication. I handle backend bug fixes, API development, database optimization, server deployment, and long term backend maintenance to keep your software running smoothly.

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