Freelancer profile translated to English.
Back to original languageAbout Xavier
I am a senior IT consultant specializing in technological infrastructure, systems, networks, virtualization, and defensive cybersecurity for SMEs and companies that need stable, secure, documented, and improvisation-free IT.
I have over 20 years of experience solving real problems in servers, networks, workstations, backups, storage, printers, remote access, business continuity, complex incidents, and legacy environments. Since 2010, I have managed the technical activities of Krtush Ink.
I analyze how the infrastructure is set up, detect risks, dependencies, and weak points, and propose improvements. I don't just install; I aim for the client to understand what they have, what's failing, what's critical, and what steps to take to gain stability, security, and control.
I work with Windows Server, Linux, Active Directory, RDS, VMware, Proxmox VE, Hyper-V, OPNsense, pfSense, VLANs, switches, firewalls, VPNs, MFA, Veeam, Proxmox Backup Server, RAID/ZFS, NAS, monitoring, technical documentation, and advanced support.
Furthermore, I have a technical team that expands the scope of projects in two areas. On one hand, defensive cybersecurity, hardening, vulnerability analysis, log review, monitoring, and initial incident response. On the other, software development and deployment: Android/iOS applications with Flutter, web with Next.js and TypeScript, PHP, JavaScript, WordPress, MySQL, PocketBase, and Supabase databases, Hetzner cloud, and containerization and automation with Coolify.
We can handle audits, diagnostics, virtualization, backups, recovery, migrations, users and permissions, Active Directory, firewalls, VPNs, VLANs, exposed services, hardening, inventory, procedures, MVP development, web and mobile applications, automation, cloud, deployment, and maintenance.
I work clearly, seriously, and closely. I explain what I do, document important changes, and leave the environment more understandable, stable, secure, and maintainable.
Spanish
Native or bilingual
English
Fluent
Catalan
Native or bilingual
Can work on-site
Barcelona (up to 50km), Tarragona (up to 50km), Igualada (up to 50km)
Experience
- Earthpulse SL
On Malt
Network Audit, Connectivity Diagnosis, and Cybersecurity AdequacyRESEARCHJune 2026 - July 2026Barcelona, Spain- Diagnosis of intermittent connectivity issues.
- Analysis of the existing network infrastructure.
- Review and validation of the Synology router (SRM) configuration.
- Review and validation of the Movistar HGU router configuration.
- Verification of network topology, WAN link, PPPoE session, NAT, and DMZ.
- Checking the operation of Smart WAN, link priorities, and routing policies.
- Validation of IP addressing, gateways, DNS, and connectivity parameters.
- Review of firmware status and checking for available updates.
- Verification of the general equipment status, system logs, and operating parameters.
- Analysis of possible double NAT conflicts, routes, and internet access configuration.
- Identification of potential causes for intermittent connectivity losses.
- Definition of the diagnostic procedure and test plan for future incidents.
- Preparation of technical documentation for the intervention and improvement recommendations.
- Krtush InkIT Technical Manager / Systems and Advanced Support ConsultantTECHJanuary 2010 - Today (16 years and 7 months)Sant Sadurni d'Anoia, Spain
- Technical direction and provision of IT services for individuals, freelancers, SMEs, and companies: systems, networks, infrastructure, advanced support, maintenance, backup, business continuity, documentation, and defensive cybersecurity.
- Management of a historical portfolio of over 2,600 clients, with recurring support, direct assistance, incident prioritization, and technical closure.
- Design, implementation, and maintenance of IT solutions adapted to real business needs: servers, networks, switches, firewalls, racks/data centers, remote access, backups, CCTV, workstations, printers, corporate services, and defensive security.
- Administration and support of VMware, Proxmox VE, Windows Server, Linux, Active Directory, RDS, OPNsense/pfSense, Veeam, Proxmox Backup Server, RAID/ZFS, NAS, VLANs, and monitoring.
- Resolution of critical incidents in servers, virtualization, networks, backups, system recovery, hardware, users, permissions, remote access, business continuity, and security.
- Design and improvement of backup and resilience strategies: copy verification, restore tests, incident recovery, and validation.
- Review and improvement of SME cybersecurity posture: hardening, firewalls, VPNs, exposed services, passwords, MFA, network segmentation, and reduction of exposure surface.
- Technical analysis of risks and weak points in servers, networks, Active Directory, backups, remote access, user equipment, and corporate services.
- Monitoring, log review, alerts, dashboards, event analysis, and initial response to security incidents: basic isolation, operational recovery, and access reinforcement.
- Technical documentation, inventory, network maps, IP addressing, VLANs, configurations, procedures, Power BI, and intervention tracking.
- Coordination of a technical team specialized in defensive cybersecurity, administrative staff, sales, interns, suppliers, and clients.
- Projectes d'Enginyeria i Manteniment d'Extintors, S.L. (PIMEXA)Installation Technician / Security, PCI, CCTV, and Intrusion TechnicianPUBLIC SAFETYJanuary 2003 - January 2010 (7 years)Barcelona, Spain
- Professional start in fire protection systems, security, CCTV, intrusion, and technical installations, progressing to first-class technician roles in installation, maintenance, and field incident resolution.
- Installation and maintenance of fire protection systems, extinguishers, fire detection, control panels, detectors, barriers, burglar alarms, CCTV, intrusion detection, sprinklers, piping, and water rings.
- Execution of installations at client sites, construction sites, industrial environments, businesses, wineries, cellars, and production facilities, working with autonomy, order, precision, and adherence to deadlines.
- Solid experience in assembly, cabling, wiring, connections, tool usage, functional testing, field diagnostics, practical interpretation of installations, and incident resolution.
- Direct client interaction, on-site coordination, work supervision, final installation validation, and adaptation to environments where safety, installation cleanliness, and service continuity were key.
- Transferable technical foundation to IT infrastructure: structured cabling, racks, CCTV, electronics, physical diagnostics, client work, practical incident resolution, and critical system maintenance.
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Education
- Computer Systems Operation TechnicianColegio del Amor de Diós2006Formación profesional orientada a la explotación, mantenimiento y soporte de sistemas informáticos, equipos y redes. Contenidos principales: instalación y mantenimiento de equipos informáticos, sistemas operativos, redes locales, hardware, software, diagnóstico de incidencias, soporte a usuarios, mantenimiento preventivo y correctivo, periféricos, documentación técnica y resolución práctica de problemas. Base formativa aplicada posteriormente a soporte IT, administración de sistemas, redes, servidores, virtualización, backups, infraestructura física, cableado, racks, reparación de equipos y mantenimiento informático para empresas.