Jair León

Backend & AI Engineer

I build backend systems and AI integrations that scale. 4+ years shipping reliable APIs with NestJS, Python, and FastAPI.

AI / MLBackendFrontendAutomation

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Jair León

About

I'm a Backend & AI Engineer from Mexico with 4+ years designing and building REST APIs, microservices, and intelligent pipelines. I specialize in NestJS, Python, and FastAPI — and I care deeply about clean code, developer experience, and shipping things that actually work.

Currently working at Rotoplas as a Fullstack Engineer, and contributing to a year-long project at Google.

pt2-backend-v2

Production-grade REST API with auth, roles, and real-time sync — built with NestJS and TypeScript.

pt2-frontend

Full-featured client app consuming the pt2 API — TypeScript from end to end.

pt2-ai

AI inference pipeline integrating ML models into a production API — Python-powered.

Introducción a Mongoose

Practical Mongoose guide with full CRUD — used as a learning resource by the community.

hours-backend

REST API for time tracking and work-hour management, built with Python and Flask.

Connect

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Tech Stack

TypeScript

Python

JavaScript

NestJS

Node.js

FastAPI

Flask

PostgreSQL

MongoDB

DockerREST APIsAI/ML

Weather

Nextlalpan, MX

Music

Discord