Guillem Mateos
DevSecOps at Nellcote Ltd
Vilanova i la Geltrú, Catalonia, Spain
Summary
👤
Senior🎓
Top SchoolGuillem Mateos is a seasoned DevSecOps and technology leader with over a decade of experience building and securing cloud and networked systems, currently serving as DevSecOps at Nellcote and CTO of Grupo83. A self-taught assembler and early GNU/Linux sysadmin, he co-founded grito.net and has repeatedly translated hands-on engineering into business outcomes—from growing a zero-investment website to leading startups and improving company revenue as COO. His work spans system administration, PHP/MySQL development, network architecture, and server optimization, with notable open-source contributions to LibreNMS adding device support and refining OS detection for real-world network monitoring. Guillem blends low-level curiosity (disassemblers and ASM) with pragmatic infrastructure design, often owning both technical implementation and strategic product decisions. He holds an MSc in Telecommunications Engineering and brings a persistent builder’s mentality to security-conscious, production-grade systems.
10 years of coding experience
12 years of employment as a software developer
UPC Universitat Politècnica de CatalunyaCisco CCNA Courses, Networking, Cisco CCNA Courses, Networking at NEWI, Glyndr University
Spanish, Catalan, English
Github Skills (9)
monitoring10
snmpd10
network10
snmp10
php10
network-monitoring10
rrdtool9
laravel-mix8
laravel8
Programming languages (7)
Github contributions (5)
librenms/librenms
Oct 2016 - Nov 2016
Community-based GPL-licensed network monitoring system
Role in this project:
Backend Developer
Backend DeveloperContributions:19 commits, 6 PRs, 29 comments in 1 month
Contributions summary:Guillem primarily contributed to the enhancement of the Librenms network monitoring system by adding support for new devices, specifically SAF Tehnika and Ceragon CeraOS wireless devices. This involved implementing device-specific polling mechanisms, adding MIB definitions for SNMP data collection, creating graph definitions for visualization, and integrating temperature and voltage sensors. The user also refactored and updated OS detection logic within the system.
snmpcommunity-basedlicensedgplphp
guillemmateos/librenms
Sep 2016 - Nov 2016
Contributions:4 PRs, 32 pushes in 1 month
community-basedlicensedgplnetwork-monitoringsystem-monitoring
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