I will build a backend rest API with python and fastapi

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donovan_nud
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donovan_nud
Donovan A.
build a backend rest API with python and fastapi
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build a backend rest API with python and fastapi

About this gig

Need a solid backend for your app or platform?


I build REST APIs and backend systems with Python (FastAPI/Flask), following clean, production-ready architecture not quick hacks.


What I can build:

REST APIs with CRUD operations

JWT authentication & role-based access control (RBAC)

PostgreSQL/SQLite database design

Caching with Redis

Background tasks (Celery)

Docker deployment & CI/CD setup

AI/LLM integration (RAG, semantic search)


Why work with me:

Layered architecture clear separation between business logic, data, and API layers

Production-minded: auth, validation, error handling done right

Real portfolio of completed backend systems (e-commerce, fintech, task management, AI-powered services)


Not sure if I can build what you need? Message me first I'll give you an honest answer, not a sales pitch.

  • Expertise

    • Performance
    • Operating systems
    • Databases
    • Source control
    • Testing procedures

  • Programming language

    • Python

  • Backend framework

    • FastAPI
    • Flask

Get to know Donovan A.

Donovan A.

Python Backend Developer, FastAPI, REST APIs, JWT Auth, PostgreSQL

  • FromMexico
  • Member sinceJan 2026

  • Languages

    English, Spanish
Backend developer specialized in Python REST APIs. I design and build systems with FastAPI and Flask, focusing on clean layered architecture, JWT authentication, and production-ready deployment with Docker and CI/CD. I work independently analyzing and extending complex systems, with focus on maintainability and clear separation between business logic, data layer, and transport. Background includes e-commerce backends with order/stock management, RBAC permission systems, and RAG/LLM service integration.

My Portfolio

Other Software Development Services I Offer

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