Maintain Linux servers on Enterprise distributions (Debian, Ubuntu and RHEL), performing performance troubleshooting, kernel management and administration of critical services such as Nginx, Apache and databases.
Operate and validate backup policies and Disaster Recovery plans, ensuring compliance with the business-defined RPO and RTO.
Configure and maintain network topologies, including VLANs and static and dynamic routing.
Ensure the stability and operation of VPN tunnels (Site-to-Site and Client-to-Site).
Administer essential infrastructure services such as DNS, Active Directory (AD), DHCP and IP address management.
Apply hardening practices to operating systems and services to reduce the attack surface.
Manage perimeter security using firewalls (FortiGate or similar), ACL rules, WAF and monitoring of intrusion attempts.
Support GRC activities by providing technical evidence for ISO 27001 audits and compliance with LGPD (Brazilian General Data Protection Law), ensuring traceability and access control (IAM).
Implement automation of operational routines using scripts (Bash and Python) and Infrastructure as Code tools (Ansible and Terraform), ensuring conformity with approved standards.
Maintain monitoring platforms (Zabbix and Grafana) and log analysis systems (Wazuh and ELK), working proactively to prevent service degradation.
Requirements
Advanced expertise in Linux server administration.
Hands-on experience with virtualization using Proxmox.
Solid knowledge of TCP/IP protocols, the OSI model and troubleshooting latency and connectivity issues.
Experience with critical Private Cloud environments.
Familiarity with cryptography, SSL/TLS certificates and vulnerability management.
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