Javier Marcos
Infrastructure Security, Operations And Software Development
Escaldes-Engordany, Andorra
Summary
🤩
Rockstar🎓
Top SchoolJavier Marcos is a seasoned security engineer with 13 years of experience specializing in platform and infrastructure security, threat detection, and SecDevOps across high-scale tech companies. He has held senior roles at Facebook, Airbnb, Uber, BitMEX and Chainlink Labs, blending offensive and defensive expertise to harden production systems and lead incident response. Javier is hands-on in building detection and automation tooling—contributing to notable open-source projects such as osquery and StreamAlert—and has engineered CI/CD, telemetry and backend improvements for Chainlink and other projects. His background spans low-level system instrumentation to product security, giving him a rare ability to translate research-grade detection into operational controls. Based in Andorra, he pairs a pragmatic engineering mindset with deep incident-response experience and a penchant for “CYBER shenanigans” that fuels creative security tooling.
13 years of coding experience
13 years of employment as a software developer
BSc + MSc in Computer Science / Computer Engineering, BSc + MSc in Computer Science / Computer Engineering at Universidad de León
English, Portuguese, Spanish, French
Github Skills (51)
c-language10
web-application10
back-end-development10
python10
scripting10
mysql10
testing10
authentication10
user-authentication10
security10
php10
script10
go10
aws10
webapp10
Programming languages (9)
Github contributions (5)
facebookarchive/fbctf
Jan 2016 - Feb 2017
Platform to host Capture the Flag competitions
Role in this project:
Back-end Developer
Back-end DeveloperContributions:201 commits, 96 PRs, 59 pushes in 1 year
Contributions summary:Javier primarily contributed to the development of the Facebook CTF platform by adding and modifying PHP files related to user sessions, game pages, and the database structure. They implemented user login and registration functionality, along with basic administration features, including team and level management. Their work involved the addition of new database tables and the creation of supporting HTML templates and JavaScript files to facilitate the platform's front-end and back-end integration.
capture-the-flagctfhostctf-framework
osquery/osquery
Sep 2014 - Aug 2019
SQL powered operating system instrumentation, monitoring, and analytics.
Role in this project:Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:185 commits, 124 PRs, 61 pushes in 5 years
Contributions summary:Javier contributed to the osquery project by adding and modifying code related to system instrumentation and monitoring. Their work included adding virtual tables like "last" for system access information and modifying the provisioning scripts to support building and running osquery on different operating systems. The user also refactored the build process and improved the build support for various Linux distributions and CentOS versions.
monitoringoperating-systemsqlsecurityintrusion-detection
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