Systems
Distributed processing, Linux performance analysis and automation with Python and Bash.
Xosé Fernández · Systems & Infrastructure Engineer
I design andbuild systemsfrom the inside out.
I work close to the system: understanding how components interact, measuring behavior and turning that understanding into practical tooling.
- PhDDigital forensics
- RootedCONMadrid 2025 speaker
- ResearchPerformance to privacy
01 / Profile
Complexity is only useful when you can explain it.
I work beyond the interface: tracing how systems behave, diagnosing failure modes and turning that understanding into infrastructure and tooling that holds up in practice.
02 / Practice
A systems point of view
Build it. Measure it.
Take it apart.
Virtualization & storage
VM lifecycle, snapshots, copy-on-write clones and storage performance with Proxmox and ZFS.
Networking
TCP/IP teaching, cluster benchmarking and VLAN-aware lab networking.
Security
Browser internals, memory analysis, digital forensics and practical hardening.
03 / Personal project
Proxmox VE · OpenZFS · Shell
PVE Forge
Disposable virtual machines from normal, updateable base VMs.
It creates linked or full ZFS clones and handles static addressing, firewall isolation, PCI passthrough and dependency-aware snapshot cleanup.
04 / Writing
Technical notes
Show the thinking,
not just the result.
Latest entry01
Building disposable Proxmox VMs from mutable base VMs with ZFS
How I kept normal, updateable base VMs in Proxmox VE while creating fast ZFS linked clones from them.
05 / Next
For the right challenge
I’m listening.
If you are building ambitious infrastructure and value engineers who want to understand the whole system, I would like to hear about it.
Start a conversation