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Matias Sack

@matiassack

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Application Support and SRE Support analyst at Mercado Libre, automating incident analysis with Python and Go.

Argentina

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At Mercado Libre, I investigate application errors, incidents, and operational anomalies, using technical information and internal metrics to help identify root causes and support resolution with development teams.

I developed Python scripts to work with internal APIs and metrics tools, and small Go applications to address technical and operational needs. I also used Claude Code and Codex for scripting, automation, and troubleshooting.

Before Mercado Libre, I developed web applications with PHP and CodeIgniter at Bombieri and backend features in Java for Río Uruguay Seguros. My earlier work included SQL-based testing and support at Galbop, migrating a legacy COBOL system to a web application at Municipalidad de Gualeguaychú, and QA testing at Pirámide Technologies.

Experience

Work history, roles, and key accomplishments

Analista Técnico / Application Support / SRE Support

Mercado Libre

Mar 2021 - Oct 2026 (5 years 7 months)

Investigated and diagnosed errors, incidents, and technical issues reported via internal tickets. Analyzed frictions and failures in applications and processes to identify root causes, and collaborated with development teams to facilitate resolution.

Application Support Site Reliability Engineering (SRE) Support Incident Management Troubleshooting Root Cause Analysis Ticket Management Metrics Analysis Monitoring Process Automation Python Go Claude Code OpenAI Codex Generative AI LLM Prompt Engineering

Desarrollador PHP / Java

Bombieri

May 2019 - Mar 2021 (1 year 10 months)

Developed web applications using PHP and the CodeIgniter framework for private clients. Developed backend solutions in Java for Río Uruguay Seguros in the insurance industry.

PHP CodeIgniter Java Backend Development Web Applications

Tester / Soporte técnico

Galbop

Aug 2018 - May 2019 (9 months)

Executed SQL queries for data validation and diagnosis. Detected and reported bugs, and resolved technical issues for clients.

SQL Testing Bug Reporting Technical Support

Desarrollador / Programador

Municipalidad de Gualeguaychú

Nov 2017 - Aug 2018 (9 months)

Migrated a legacy COBOL system to a modern web application. Developed with PHP, AJAX, JavaScript, HTML, Bootstrap, and jQuery, and performed unit testing.