Senior Systems Administrator

Lennor Group; Southern Manila District; On-site; PHP 400,000 - 600,000; Full time

Job summary

A leading recruitment agency in the Philippines is seeking a Senior Systems Administrator to lead cloud and on-premise infrastructure management. The ideal candidate will have extensive experience in IT systems administration, including managing Microsoft Active Directory and cloud environments like AWS. Strong communication skills and a proactive approach to system management are essential for this role, which offers a competitive salary range of ₱75,000-₱85,000. The position is onsite in Metro Manila.

Qualifications

• 5-8 years experience in IT systems administration, at least 3 years in a senior role.
• Direct experience managing Active Directory and Microsoft Entra.
• Cloud administration in AWS and Google Cloud or Azure.
• Experience building and managing Linux instances.
• Strong analysis skills for root cause identification.

Responsibilities

• Lead AWS/Azure infrastructure design and deployment.
• Optimize Active Directory management.
• Implement cloud optimization tools.
• Maintain Windows/Linux servers.
• Configure and monitor network systems.

Skills

IT systems administration experience

Microsoft Active Directory management

Cloud administration

Linux server management

Scripting skills (PowerShell, Python)

Analysis and problem-solving skills

Vendor Management

Disaster Recovery strategies

Communication skills

Tools

AWS

Microsoft Entra

Cisco Meraki

Prometheus

Grafana

Job description

We at the Lennor Group are urgently looking for a Senior Systems Administrator to join one of our global clients.

About Lennor Group

As a proud Filipino company, we are committed to providing world-class business and workforce solutions. Our deep market expertise, combined with a global perspective, empowers us to serve businesses of all sizes and industries efficiently.

Our brand, Lennor Metier, is a leading recruitment agency and headhunting firm in the Philippines, partnering with reputable companies to source top talent for direct-hire opportunities. It specializes in IT, Finance, Engineering, Sales & Marketing, Supply Chain, HR, and Executive Search.

Salary Range: ₱75,000- ₱85,000

Work Setup: Onsite

Shift Schedule: Day Shift

Location: Pasay City, near MOA

Job Overview

The ideal candidate will be crucial in managing system platforms across both on-premise and cloud provided solutions ensuring they are robust, secure and scalable. The candidate should be an energetic, passionate individual who brings new ideas to system administration and infrastructure to help keep the company moving forward.

Your Responsibilities:

Cloud & On-Premise Infrastructure Leadership

• Strategic Design & Implementation: Lead AWS/Azure infrastructure design and deployment with internal teams and vendors, aligned with business and technical goals
• Active Directory (AD) Management: Optimise AD across locations—manage users, policies, permissions, and implement MFA and conditional access
• Cloud Optimisation: Use cloud-native tools and automation to improve performance and reduce costs without compromising security
• Server Administration: Maintain Windows/Linux servers—patching, updates, tuning, HA/DR readiness for critical systems
• Network Oversight: Configure and monitor Cisco Meraki networks; collaborate with cybersecurity on network hardening

Proactive System Administration

• Security Leadership: Partner with Cybersecurity to enforce ISO 27001, NIST, CIS standards; conduct audits and vulnerability assessments in line with overall business goals
• Performance Monitoring: Use Prometheus/Grafana to identify bottlenecks; build dashboards for real-time metrics visibility
• Backup & Disaster Recovery: Manage backup and disaster recovery strategies for cloud/on-premise; test and validate procedures regularly
• Automation & Scripting: Build Python/PowerShell scripts to automate tasks; mentor juniors in automation best practices

Driving Improvements and Changes

• Problem Management: Lead root cause analysis, implement fixes, and share insights to prevent recurring issues
• Project Leadership: Own infrastructure and user-facing projects; collaborate across teams for successful delivery
• Vendor Management: Participate in service reviews, negotiate contracts, and lead procurement for cost-effective solutions

Team Leadership and Mentorship

• Mentorship: Guide junior staff, promote learning, and support professional growth within the team
• Collaboration & Communication: Serve as a technical expert, resolve complex issues cross-functionally, and communicate clearly with stakeholders

What our Client is Looking For:

ESSENTIAL Skills

• Ideally 5-8 years of experience in IT systems administration, with at least 3 years in a senior role managing enterprise-level Windows and Linux environments at scale (500+ end points)
• Direct experience of managing Microsoft Active Directory and Microsoft Entra – including PowerShell scripting
• Cloud administration in an AWS environment (as well as Google Cloud or Azure)
• Building / Managing of Linux instances (preferably CentOS or RedHat)
• Strong analysis skills – Proven ability to identify root causes, implement fixes, and lead improvements to boost system reliability and security
• Vendor Management – Track record of working with vendors to meet SLAs, negotiate contracts, and align solutions with business needs.
• Hands-on use of tools like Endpoint Central to manage assets and automate tasks efficiently.
• Skilled in designing Disaster Recovery and High Availability strategies for cloud and on-premise systems.
• Skilled in automation using scripting languages (PowerShell, Bash, Python) and tools like Ansible and/or Terraform
• Excellent communication skills in both written and spoken English

DESIRABLE Skills:

• Experience of handling updates on Meraki/Cisco or other next-gen firewalls and Linux instances
• Industry certifications in: Microsoft MCSE, Microsoft 365, AWS (Amazon Web Services), ITIL v3 or v4
• Cisco Certified Network Associate (CCNA)
• Familiar with security standards such as ISO27001/NIST/CIS
• Database Administration – familiar with regular DBA tasks on Oracle, MySQL/MariaDB, etc
• Use of tools like Prometheus and Grafana to track metrics and optimize performance.
• Ability to guide junior staff and promote learning and best practices.

Ready to take the next step in your career? Submit your application now!