Lion Systems

Lion Systems is an independent software development and IT consulting practice based in Mexico City, founded in 2025 by software architect David León. We design, build and secure business systems for small and mid-sized companies and institutions, in Mexico and remotely for clients abroad.

David has more than 15 years of experience on critical systems for government, education and banking. He has worked with C#/.NET since 2009 and today builds with Node.js, TypeScript, React, Angular, GraphQL and PostgreSQL, deployed with Docker on Google Cloud. Before Lion Systems he managed development teams at a Mexican consultancy that served large banks, built the sessions, attendance and voting system of Mexico's Chamber of Deputies, and worked on the architecture of a national student-enrollment registry using RabbitMQ and Kafka.

What we do:

• Custom software and integrations: web systems, APIs and integrations, delivered with tests and controlled deployments.
• Security assessments: a fixed-price, human-led review of a website and server, with prioritized findings and a remediation plan.
• Managed cloud and Odoo: server and Odoo administration with verified backups, uptime monitoring and security updates; Odoo migrations to versions 19/20.
• Products: we build and run our own products, including an online exam-preparation platform, Form2PDF, CotizaAI and a SPEI payments plugin for WooCommerce.

How we work: every project starts with a short assessment to agree on scope and schedule. You work directly with the architect. We use AI tools every day to move faster, but every change is reviewed by a person and nothing ships without passing its tests. Spanish and English, Mexico City time (UTC-6), overlapping US business hours.