hernies.net

Hernán Calvo

Computer Engineer — Systems, Networking & Automation

download pdf portfolio →

Computer engineer with hands-on experience in Linux systems, network security (VPN/IPSec, X.509/PKI) and infrastructure support. Currently the sole IT engineer for Alibaba International's European offices, covering server administration, provisioning and asset management. AWS Cloud Foundations trained and studying an MSc in DevOps, with practical use of GitHub Actions CI/CD, Docker, systemd and Bash/Python scripting on self-hosted projects.

hernies.net github.com/Hernies linkedin.com/in/hernan-calvo-aguiar

Skills

Systems
Linux (Ubuntu, NixOS, RHEL, Raspberry Pi OS), systemd, Windows 10/11, KVM/libvirt
Network & security
VPN/IPSec (StrongSwan), X.509/PKI, LDAP, Fortigate
Scripting & code
Bash, Python, C++, PHP, Java
CI/CD & tooling
Git, GitHub Actions, Docker, Nginx, Apache, MySQL basics
Monitoring
Prometheus, Grafana (exposure in R&D)

Experience

IT Engineer — Europe

Jan 2026 – present

Alibaba International · Madrid, Spain

Sole IT engineer for the European offices

  • User support and helpdesk for all of Europe: onboarding and offboarding, meeting rooms, laptop lifecycle.
  • Server setup and coordination with the global Infrastructure team on system images.
  • Redesigned the device provisioning process for new hires.
  • IT asset and stock management, including a refresh program for laptops over 48 months old.
  • Rolled out AppleCare Enterprise coverage for the European fleet.

R&D Department

Jun 2023 – Jun 2024

Real Energy Systems · Madrid, Spain

Internship → full-time contract

  • Supported the VPN/IPSec infrastructure (StrongSwan) securing thousands of field devices.
  • PKI: X.509 certificate issuance for devices and services.
  • Systems administration: Linux servers, NAS administration with LDAP.
  • Developed and maintained PHP tools for automation data visualization.
  • Automated recurring tasks and resolved technical incidents; exposure to GitLab, Prometheus and Grafana.

Education

Master's Degree in DevOps (in progress)

2026 – present

UNIR

Academic exchange — Mandarin Chinese

2025

Beihang University 北京航空航天大学 · Beijing, China

Bachelor's Degree in Computer Engineering

2019 – 2025

Universidad Politécnica de Madrid (UPM) · Madrid, Spain · rebuild →

  • Thesis: NILM, AI applied to household energy consumption (C++, custom dataset, multithreading)

Projects

Self-hosted assistant on Raspberry Pi 5

Python service in production: syncs a university calendar (ICS) into Google Calendar every 30 min.

  • Idempotent sync with guarded deletions (only after two runs without the event, capped per run); pytest suite.
  • Hardened systemd unit and timer (ProtectSystem=strict, NoNewPrivileges, syscall filter); secrets kept out of git.

Python · systemd · Raspberry Pi OS · OAuth

NixOS configuration

Declarative workstation setup with Nix flakes, split into shared and per-host modules.

NixOS · Nix flakes

hernies.net

Personal site (Astro) built and deployed with GitHub Actions CI/CD.

GitHub Actions · Astro

Homelab

KVM/libvirt virtual machines for RHEL practice.

KVM · libvirt · RHEL

Certifications

  • AWS Cloud Foundations (IAM, EC2, VPC) — training · AWS Academy

Languages

Spanish (Native) · English (Bilingual) · Mandarin Chinese (B1 (HSK3), preparing HSK4)