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Jaime Andrés Arnaiz

Junior Sysadmin

Reproducible, secure and documented infrastructure.

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About

I’m a junior sysadmin who learns fast and adapts quickly. In my internship I moved between server migrations, user support and Microsoft 365 administration, picking up each new tool as the work required it.

I like being the person teams can count on: helping users solve their day-to-day issues, taking initiative when something is stuck, and writing documentation so the next person doesn’t start from zero.

Right now I’m looking for my first role in systems administration or DevOps, where I can keep learning from a team and contribute from day one. Meanwhile, I’m studying Kubernetes towards the CKA.

Education

  1. Present · certification

    CKA: Certified Kubernetes Administrator · CNCF

    Hands-on, performance-based CNCF exam on administering Kubernetes clusters: installation and configuration, workloads and scheduling, services and networking, storage, and troubleshooting. In progress.

    • Kubernetes
    • Linux
    • Networking

  2. Aug 2026 · certification

    Terraform Associate · HashiCorp

    HashiCorp certification on infrastructure as code with Terraform: the core workflow (init, plan, apply, destroy), providers, modules, state management, the configuration language and HCP Terraform basics.

    • Terraform
    • IaC

  3. Sep 2024 — Jun 2026 · diploma

    Computer Network Systems Administration · CIFP Juan de Colonia, Burgos

    Two-year higher vocational program in IT systems and network administration: installing and managing Linux and Windows servers, network services, databases, virtualization, scripting and security.

    • Linux
    • Networking
    • Bash
    • Scripting
    • Virtualization
    • Security
    • Windows
    • SQL
    • PHP
    • Services

Experience

  1. Next role

    Open to junior sysadmin / DevOps roles

    Contact

  2. Feb 2026 — Jun 2026

    5 mo

    Systems Administrator Intern · Nicolás Correa S.A.

    IT department of an industrial CNC machine manufacturer: upgraded an out-of-support Linux server after previous attempts had failed, and supported day-to-day IT operations.

    • Linux
    • Ubuntu
    • Apache
    • MySQL
    • Bash
    • Microsoft 365
    • Entra ID
    • Active Directory
    Server migration4 tasks

    • Upgraded the server hosting the company's IT asset inventory from Ubuntu 20.04 LTS (EOL) to 24.04 LTS, after previous attempts had failed

    • Upgraded the asset management application (GLPI) from 10.0.18 to 11.0.7

    • Reconfigured the Apache2 virtual hosts and migrated the MySQL database without data loss

    • Driven by known vulnerabilities in the unsupported versions, as part of the ISO 27001 preparation; delivered ready for promotion to production

    • Linux
    • Ubuntu
    • Apache
    • MySQL
    • GLPI
    IT operations4 tasks

    • Administered Microsoft 365 and Entra ID

    • Managed computers in Active Directory with operator permissions

    • Supported users and shop-floor CNC software (Siemens, Heidenhain)

    • Automated recurring administrative tasks with Bash scripting

    • Microsoft 365
    • Entra ID
    • Active Directory
    • Bash
    Documentation1 task

    • Wrote the department's technical documentation and internal procedures to standardise recurring tasks, still in use

Projects

  • Multi-account AWS landing zone

    A Terraform account factory that provisions isolated tenant accounts inside an AWS Organization, with Terraform state split by blast radius and centralised policies and auditing.

    • Terraform
    • AWS
    • AWS Organizations
    • IAM

    repo ↗

  • Documentation service infrastructure

    Reproducible Docker Compose stack for a corporate documentation service: isolated networks, NGINX as the single HTTPS entry point backed by a local CA, LDAP authentication, and Prometheus and Grafana monitoring.

    • Docker
    • NGINX
    • TLS
    • LDAP
    • Prometheus
    • Grafana

    repo ↗

  • Portfolio

    This site: a Next.js static export built and deployed through a GitHub Actions CI/CD pipeline.

    • GitHub Actions
    • CI/CD
    • Next.js

    repo ↗

  • Hardened container for Claude Code

    Isolated Docker environment for running Claude Code with minimal access to the host: non-root user, no-new-privileges, dropped capabilities and scoped volumes.

    • Docker
    • Linux
    • Bash

    repo ↗