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FRANCESC CASTELL
— EXPERIENCE

Five years, five roles.

From administering networks for municipalities to modernising AWS infrastructure for Tier-1 public sector clients. A trajectory from systems to cloud to AI-infused operations.

  1. Cloud Engineer · IThinkUPC

    May 2025 — Present
    Barcelona, Catalonia Hybrid 1 yr 3 mos Current

    Modernizing critical infrastructure for Tier-1 clients in the public sector and large enterprise. Designing secure, scalable AWS architectures and automating the full software delivery lifecycle.

    • Co-designing resilient cloud architectures for critical government and enterprise services, ensuring high availability and ENS compliance.
    • Leading the development of modular, reusable Terraform codebases that standardize deployments across multiple environments and reduce configuration drift.
    • Built Homer, an internal CLI (Python/Bash) that abstracts complex Terraform workflows and measurably improves developer experience.
    • Orchestrating advanced GitHub Actions pipelines with automated testing, security scans and seamless rollouts.
    • Designing end-to-end monitoring with Centreon and Grafana for real-time visibility into infrastructure health and business metrics.
    • Exploring AI-driven infrastructure operations (LLMOps) to optimize internal workflows.
    AWS Terraform Packer GitHub Actions Centreon Grafana Python n8n
  2. SysAdmin & Cloud Services Administrator · SII Group Spain

    Sep 2024 — May 2025
    Barcelona, Catalonia Remote 9 mos

    Comprehensive management of technological infrastructures for municipalities, high-level corporations and cloud environments. Ensuring efficiency, security and scalability of critical systems.

    • Coordinated and administered critical networks and systems for municipalities and large corporations.
    • Administered and troubleshot cloud infrastructures, resolving advanced incidents.
    • Implemented and supervised network and cloud infrastructures, optimizing performance and security.
    • Collaborated with diverse teams to develop robust technological solutions aligned with each client's specific needs.
    Windows Server Azure Networking Hyper-V Active Directory
  3. Network Administrator · SII Group Spain

    Jun 2023 — Aug 2024
    Barcelona, Catalonia Hybrid 1 yr 3 mos

    Responsible for the efficiency and reliability of technological infrastructures at a national level. From network and system management to resolving complex incidents.

    • Managed and maintained network infrastructure and systems across multiple sites.
    • Resolved complex configuration incidents and IT problems.
    • Implemented continuous improvements in technological infrastructure.
    • Collaborated with cross-functional teams to develop robust and effective technological solutions.
    Networking Windows Server Cisco VPNs
  4. Network Administrator · Cototo Wifi

    Jun 2021 — Nov 2021
    Ciudadela, Balearic Islands Part-time · On-site 6 mos

    Installation, configuration and maintenance of essential LAN and WAN equipment. Designing secure and scalable network infrastructures.

    • Designed and implemented scalable and secure network infrastructures.
    • Optimized the performance and administration of computer systems.
    • Provided technical support for resolving connectivity and performance issues.
    • Ensured the integration and functionality of new technologies in the existing network.
    LAN/WAN MikroTik Ubiquiti Fiber
  5. Network Systems Administrator · Internship · Parlament de les Illes Balears

    Jan 2021 — Jun 2021
    Palma, Balearic Islands On-site 6 mos

    Managed and administered networks and systems with a focus on optimization and security. Implemented custom solutions with Python.

    • Implemented and maintained switches for LAN networks and configured VLANs.
    • Developed customized technological solutions using Python.
    • Optimized network infrastructure using Cisco products, including CCNA and Cisco ASA.
    • Provided agile and effective technical assistance in critical situations.
    Cisco IOS ASA Python VLAN