Jair León

Backend & Platform Engineer

Event-driven integration platforms that make CRM, logistics and commerce systems agree with each other — NestJS, TypeScript, PostgreSQL and Google Cloud.

Jair León

About

Idempotent, replayable, observable — and fast.

Based in Mexico City. At Grupo Rotoplas I lead the integration platform syncing HubSpot with Bringoz, Commercetools and Fluent OMS (97–100% test coverage, OpenTelemetry and Terraform as code) and co-lead a greenfield B2B operational CRM on NestJS and PostgreSQL. Previously GPT-powered document extraction at FP Alpha.

Credit Risk Platform · Backend

NestJS microservices that assess the credit risk of loan applications with an ML model — Dockerized and deployed to AWS ECR.

Credit Risk Platform · AI

Credit-scoring model trained with scikit-learn and NumPy that powers the platform's risk decisions.

TimothyApp

The pioneer helper — a full-stack app I'm building end to end with NestJS (in progress).

Intro to Mongoose

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

Credit Risk Platform · Frontend

Angular client for the credit risk platform, deployed on Vercel.

Connect

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Tech stack

TypeScript

JavaScript

Python

NestJS

Node.js

Flask

PostgreSQL

MySQL

MongoDB

Redis

Prisma

Google Cloud

AWS

Azure

Terraform

Docker

Kubernetes

OpenTelemetry

Vitest

AngularREST APIsAI/ML

Weather

Nextlalpan, MX

Music

Discord