Systems administration
Day-to-day management of Windows and Linux servers, users, backups and monitoring.
Hi, I'm
Álvaro Romero Castillo
SysAdmin · Developer · Madrid
I build, maintain and automate systems. From infrastructure to the final product.
01 — About
- Location
- Madrid, Spain
- Experience
- 2+ years of experience
- Certification
- AWS Cloud Practitioner
A profile that bridges systems and code.
I am an IT support technician and systems administrator based in Madrid. Passionate about infrastructure, cloud and automation, with experience in systems administration, network management, server migration and IT infrastructure optimization across Windows, Linux, macOS, Android and iOS environments.
I currently work at Antiun Ingeniería providing technical support and resolving complex incidents in Spanish and English. Alongside that I am studying Computer Engineering at UOC and building my own projects that bridge systems administration, cloud and development.
02 — Services
What I can do for you.
IT support & migrations
Cross-platform remote and on-site support. Server migrations, rollouts and incident resolution.
Cloud & infrastructure
AWS architectures, Docker containers, secure networks with WireGuard and automation with Proxmox.
Custom development
Web apps and internal tools in JavaScript, Python and Node. From the first sketch to deployment.
Got a project in mind? I work as a freelancer and would be glad to help.
Let's talk03 — Stack
Technologies I work with.
Systems
- Windows Server
- Linux
- macOS
- Android
- iOS
- Active Directory
Cloud & DevOps
- AWS
- Docker
- Proxmox VE
- LXC
- NFS
- Bash scripting
Networking & Security
- TCP/IP
- VLANs
- VoIP
- WireGuard
- Wireshark
- Firewalls
Development
- JavaScript
- TypeScript
- Python
- Node.js
- React
- Astro
- MongoDB
Tools
- Office 365
- Git
- GitHub
- Vaultwarden
- QNAP
- Figma
04 — Projects
What I am building.
Live
Homelab
Three-node Proxmox cluster with a QNAP NAS, running my self-hosted services and used to experiment with automation, secure networking and backups.
My home lab to learn, break and fix things. Three HP G2 nodes forming a Proxmox VE cluster with high availability, connected to a QNAP TS-469 Pro NAS via NFS for shared storage. On top of it, everything runs in Docker: WireGuard (through wg-easy) for secure remote access, Vaultwarden as a family password manager with data persisted on the QNAP, and other services I keep adding.
- Proxmox VE
- QNAP NAS
- Docker
- WireGuard
- Vaultwarden
- NFS
SF In progress · coming soon
In progress · coming soon
SF Platform
In-house platform under development. More details very soon.
05 — Experience
Where I have learned and contributed.
-
Technical Support Specialist
Antiun IngenieríaMay 2024 — Present · Getafe, Madrid- · Remote and on-site support across Windows, Linux, macOS, Android and iOS.
- · Hardware and software incident resolution in Spanish and English.
- · User management and administration.
- · Configuration, maintenance and updates of IT equipment.
- · Installation and optimization of systems and applications.
-
Network Technician (Internship)
Decathlon EspañaJanuary 2024 — April 2024 · Madrid- · Installation and maintenance of network infrastructure.
- · Incident management with remote and on-site support.
- · User assistance across stores and central services.
06 — Education
Studies and certifications.
Studies
B.Sc. in Computer Engineering
Universitat Oberta de Catalunya
2023 — Present
Advanced VET · Network Systems Administration
2021 — 2023
Certifications
AWS Certified Cloud Practitioner
Amazon Web Services
Aug 2023 — Aug 2026
07 — Contact
Let's talk.
Tell me what you are working on. I reply within 24 hours.
Or reach me directly