About Cláudio
Senior IT Infrastructure and Systems Administrator with extensive experience managing Linux and Windows Server environments, web hosting platforms, enterprise networks, cybersecurity, and critical public-facing services.
Specialized in Linux administration, Windows Server, Active Directory, Group Policy, Microsoft 365 integration, WordPress migrations, Apache, MariaDB, PHP, SSL/TLS, Cloudflare, DNS management, backup and disaster recovery, infrastructure modernization, and security hardening.
Experienced in migrating legacy applications and websites to modern platforms, administering mixed Windows/Linux infrastructures, troubleshooting complex production issues, and maintaining highly available systems and services.
Strong focus on security, reliability, performance optimization, business continuity, and operational excellence.
Portuguese
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- O Valor do TempoInformation Systems and Cybersecurity SpecialistMay 2016 - Today (10 years and 2 months)Lisbon, Portugal• • Administration and hardening of Windows and Linux servers in critical environments• • Security management of Microsoft 365 and Azure infrastructures• • Active Directory, Group Policy, DNS, DHCP and access control administration• • Configuration and operation of Check Point firewalls• • Design and management of secure wired and wireless networks (Cisco, Aruba, Extreme Networks)• • Implementation of security policies, network segmentation and risk mitigation measures• • Backup, disaster recovery and business continuity (Veeam, Backup Exec)• • Virtualization using VMware and Hyper‑V• • Security incident analysis, prevention and response• • Integration of new technologies following a security by design approach
- Câmara Municipal de SesimbraSenior Systems and Infrastructure AdministratorPUBLIC SECTORJune 2006 - Today (20 years and 1 month)Sesimbra, Portugal• Administration of Linux and Windows Server environments.• Management of Active Directory, DNS, DHCP and Microsoft 365 services.• Administration of Apache, PHP, MariaDB and web hosting platforms.• WordPress maintenance, upgrades and migration projects.• SSL/TLS certificate management and Cloudflare administration.• Network security, firewall and VPN administration.• Backup, disaster recovery and business continuity planning.• Infrastructure modernization, performance optimization and troubleshooting.• Support and maintenance of critical public-facing services and municipal digital platforms.
Recommendations
Be the first to recommend Cláudio
Help this freelancer shine by sharing your experience working together.
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- EngineerUniversidade Lusófona de Humanidades e Tecnologias2012Engineer
Certifications
- CEHEC-Concil2026