Senior IT Infrastructure Engineer – Cybersecurity

Location: Bicutan, Taguig

Work Arrangement: Hybrid (4x a week ONSITE, 1x a week WFH)

Shift Schedule: Nightshift

Arbcentrix is looking for an experienced Senior IT Systems/Network Administrator with a Cybersecurity focus to manage and secure IT infrastructure across systems, networks, cloud environments, cybersecurity, and ERP platforms.

This is a hands-on role for an experienced IT professional who can independently troubleshoot complex issues, support multiple client environments, and drive improvements through automation and modern technology.

What You’ll Do

• Administer Windows Server, Active Directory, and VMware environments.
• Manage Microsoft Azure environments, including VMs, networking, and identity/M365 integration.
• Configure and maintain SonicWall firewalls, VPNs, site-to-site tunnels, and security rules.
• Monitor and respond to security incidents using SentinelOne or similar EDR tools.
• Manage patching and endpoint security.
• Resolve technical support requests while meeting established SLA targets.
• Support vulnerability assessments and cybersecurity compliance initiatives.
• Configure and troubleshoot ERP systems, including integrations, workflows, and user access.
• Develop scripts and automation using PowerShell, Python, Bash, or similar tools.
• Build AI-assisted workflows to automate IT tasks such as ticket triage, alert analysis, reporting, and documentation.
• Use AI tools to support troubleshooting, scripting, documentation, and reporting while validating outputs.
• Support multiple client environments and prioritize competing technical requirements.
• Maintain technical documentation, system configurations, and incident records.
• Participate in an on-call rotation for critical issues.

What We’re Looking For

• 10 years of IT experience, with a strong background in systems administration, network administration, and/or cybersecurity.
• Hands-on experience with Windows Server and Active Directory.
• Strong experience with VMware vSphere/ESXi.
• Experience managing Microsoft Azure environments.
• Hands-on experience configuring SonicWall or similar firewalls.
• Experience with SentinelOne or comparable EDR solutions.
• Experience working with IT ticketing systems and SLAs.
• Experience configuring and troubleshooting ERP systems such as NetSuite, SAP, Dynamics, Odoo, or similar.
• Scripting and automation experience using PowerShell, Python, Bash, or similar tools.
• Experience building AI-assisted automations or workflows.
• Familiarity with backup, disaster recovery, and business continuity.
• Knowledge of ISO 27001, NIST, SOC 2, or similar compliance frameworks is an advantage.
• Strong troubleshooting, documentation, communication, and prioritization skills.

Preferred Certifications

• CompTIA Security+
• CompTIA Network+
• Microsoft AZ-104 or MS-102
• Relevant ERP certifications
• CISSP or CySA+

Why Join Arbcentrix?

• Work across multiple IT disciplines including infrastructure, cloud, networking, cybersecurity, ERP, and automation.
• Handle complex technical environments supporting multiple clients and technologies.
• Strengthen your cybersecurity expertise through hands-on security and infrastructure responsibilities.
• Build AI and automation solutions that improve day-to-day IT operations.
• Take ownership of critical systems and contribute to technical improvements across the organization.
• Apply your experience in a broad, hands-on role with opportunities to work across different technologies.