~/ whoami

David Álvarez

Systems Administrator & Cybersecurity Specialist · Galicia, Spain

Systems administrator with deep specialization in cybersecurity — from hardening production servers to conducting vulnerability audits and penetration tests. I bridge the gap between infrastructure reliability and security posture, with additional skills in web development, SEO, and digital content strategy.

Linux LXC Nginx Pentesting Networking Bash Scripting SEO
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Who I Am

I'm a Systems Administrator specialized in Cybersecurity. My technical foundation covers the full spectrum of server management — from configuring bare-metal Linux systems and containerized infrastructures, to designing and auditing secure network architectures.

On the security side, I hold certifications from Cisco in Junior Cybersecurity Analysis Career and Ethical Hacking, and my hands-on experience includes vulnerability scanning, penetration testing methodologies, threat monitoring, and access control policy design.

I also develop and maintain web infrastructure: I've built production platforms using WordPress, PHP, and Hugo, with a strong focus on performance, SEO, and security hardening at every layer.

My philosophy is simple: "making things work without anyone noticing". Good infrastructure is invisible — it just works, is secure by default, and scales gracefully. I'm driven by anticipating failure modes before they happen and building systems that are resilient, auditable, and maintainable by anyone on the team.

Beyond purely technical work, I've run digital strategy and content production — managing live streaming setups, video editing pipelines, SEO campaigns, and performance analytics.

Currently open to new projects in cybersecurity consulting, infrastructure administration, and secure web development.

Skills Matrix

Proficiency across systems, security, networking, and development domains.

Cybersecurity

Vulnerability assessment & pentesting 88%
Network security & firewalls 90%
Hardening & access control 92%
SIEM & threat monitoring 80%
Incident response 78%

Systems Administration

Linux (Debian, RHEL, Ubuntu) 95%
Docker & containerization 92%
Nginx / Apache / reverse proxy 90%
Bash scripting & automation 88%
Windows Server 75%

Networking

TCP/IP, DNS, DHCP, VPN 92%
Firewall configuration (iptables, nftables) 88%
Network monitoring & packet analysis 84%
VLAN & switching 78%
Wireless & access point management 75%

Web Dev & SEO

HTML5 / CSS3 / JavaScript 82%
WordPress / WooCommerce / PHP 80%
Hugo / static site generators 85%
Technical SEO & Core Web Vitals 88%
SQL / MariaDB / database management 76%

Timeline

Work Experience
Feb'26 - Current
Systems Administrator
Stellantis - Altia Consultores S.A.

Mar'25 - Jun'25
Developer, DB Admin & SEO
Quantum21 Ltd. (Cyprus)

Built production WordPress sites with online booking systems, custom PHP components, WooCommerce integrations, and full technical SEO optimization. Improved page speed scores and organic search rankings.

Sep'23 - Jan'26
Streaming Manager
youtube.com/@Webteis

Set up and managed the entire streaming infrastructure from scratch using OBS Studio. Live event direction, pre&post-production with DaVinci Resolve, channel management, and audience growth strategy.

2020 — present
Personal Site & Content
davidalvarezp.com

Personal technical blog and portfolio. Started on Blogger, moved to Wix, WordPress and GoHugo, now on a fully custom HTML/CSS/JS stack for complete control over design, SEO, and performance.

Education
Sep'25 - Jun'26 Current
Cybersecurity Specialization
IES Teis · Vigo, Galicia

Advanced specialization program covering ethical hacking, incident response, SIEM, forensic analysis, and network intrusion detection.

Sep'23 - Jun'2025
Higher Technician - Network SysAdmin
IES Teis · Vigo, Galicia

CFGS in Network Systems Administration. Covered server administration, virtualization, networking, databases, and scripting on both Linux and Windows environments.

Certifications

How I Think About My Work

"Good security isn't about adding locks everywhere - it's about understanding what actually needs protecting and building the right systems around it. Most breaches happen through neglected fundamentals."

// on security

"The best infrastructure is invisible. If people notice the server, something has gone wrong. My goal is for everything to just work - reliably, securely, and without drama."

// on infrastructure

"Making things work without anyone noticing."

// personal motto

Let's work together

Open to projects in cybersecurity consulting, infrastructure administration, and secure web development. If you have something interesting, let's talk.