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ESSS

Senior Infrastructure Analyst, Linux, AD, OPNsense/pfSense

ESSS

. Design, operate, and continuously improve IT infrastructure in hybrid on-premises and cloud environments .

Posted 11/9/2026full-timeSão Paulo • BrazilSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in managing and optimizing IT infrastructure across hybrid environments, with a strong focus on Linux and Windows server administration, cloud resource management, and network operations. Proficient in automation, monitoring, and vulnerability management to ensure robust and secure IT operations.

Highest-signal resume keywords
Linux AdministrationWindows Server ManagementCloud Resource Management (GCP/AWS)Network Operations (Firewalls, VPNs, VLANs)Automation (Bash, PowerShell, IaC)

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Linux (RHEL, Debian, Ubuntu)Windows ServerActive DirectoryTCP/IPVLANsFirewall Administration (OPNsense/pfSense)VMwareGCPAWSScripting (Bash, PowerShell)
Soft Skills
MentoringIndependent Decision-MakingProblem-Solving
Tools & Technologies
ZabbixPrometheusGrafanaITSM (GLPI, Jira Service Management)TLS Certificates
Industry Keywords
IAMCapacity PlanningVulnerability Management3-2-1 Backup StrategyIncident Response

Tech Stack

Tools & technologies
ApacheAWSDNSFirewallsGoogle Cloud PlatformGrafanaITSMLinuxMariaDBMySQLNGINXPHPPrometheusPythonSQLTCP/IPVMware

About the role

Key responsibilities & impact
  • Design, operate, and continuously improve IT infrastructure in hybrid on-premises and cloud environments
  • Administer Linux and Windows production servers, including hardening, patching, and capacity planning
  • Manage identity and directory services, as well as the lifecycle of accounts and access permissions
  • Operate and enhance the corporate network, including firewalls, VPNs, VLANs, routing, and QoS
  • Administer resources in GCP and/or AWS, with a focus on IAM, costs, networking, and backups
  • Maintain monitoring and alerting systems by defining metrics, thresholds, and incident responses
  • Lead vulnerability management and remediation efforts
  • Automate recurring tasks and standardize configurations using scripts, IaC, and pipelines
  • Document architecture, procedures, and runbooks
  • Handle Level 3 support tickets through ITSM systems
  • Participate in migration and upgrade projects, as well as the evaluation of new technologies
  • Mentor mid-level and junior analysts
  • Work independently on technical decisions and take end-to-end ownership of critical incidents

Requirements

What you’ll need
  • Mandatory experience and knowledge of Linux, including RHEL-like distributions (AlmaLinux/Rocky) and Debian/Ubuntu
  • Knowledge of systemd, LVM, and SELinux/AppArmor
  • Troubleshooting of CPU, memory, I/O, and network issues
  • Experience with Windows Server and Active Directory
  • Knowledge of GPO, DNS, DHCP, PKI/ADCS, and Linux–AD integration (SSSD/Kerberos)
  • Knowledge of TCP/IP, VLANs, static and dynamic routing, NAT, and VPNs (IPsec, WireGuard/OpenVPN)
  • Experience installing, upgrading, and administering OPNsense/pfSense firewalls in production environments
  • Knowledge of high availability using CARP and pfsync, WAN failover, traffic shaping, plugins, and troubleshooting
  • Experience with VMware, Proxmox, or Hyper-V
  • Hands-on experience with GCP or AWS, including IAM, VPC, compute, storage, and security
  • Knowledge of Zabbix, Prometheus/Grafana, or equivalent tools
  • Proficiency in Bash and PowerShell
  • Python is a strong plus
  • Knowledge of CIS hardening, TLS certificates, vulnerability scanners, least privilege, and MFA
  • Knowledge of the 3-2-1 backup strategy, restore testing, and defining RPO/RTO
  • Knowledge of Nginx/Apache, PHP-FPM, MySQL/MariaDB, and SQL Server
  • Knowledge of ITSM and tools such as GLPI or Jira Service Management

Benefits

Comp & perks
  • Flexible benefits card covering Meals, Mobility, Culture, Health, and Home Office, provided through a SWILE card
  • Health insurance with full coverage for the employee and no co-payment (Bradesco Nacional)
  • Support for continuing education through courses, training, specialization programs, and language assistance
  • Hybrid work model combining remote and in-office activities (2 remote days)
  • Extended maternity and paternity leave, among other benefits