Summary
Overview
Work History
Education
Skills
Certification
Timeline
Generic

HAREY CEREZO

Adelaide

Summary

Experienced Senior Unix/Linux Systems Administrator with over 15 years of expertise managing enterprise-level environments across banking, IT consulting, and technology sectors. Skilled in Solaris, AIX, RHEL, and HP-UX platforms, with strong hands-on knowledge of system installation, patching, and storage management. Demonstrated ability to support high-availability clusters, implement security hardening, and collaborate with cross-functional teams to optimise infrastructure performance. Proven track record supporting major Australian clients including Commonwealth Bank of Australia, Bank of Queensland, Westpac, and others.

Overview

18
18
years of professional experience
1
1
Certification

Work History

Linux System Administrator

Accenture Philippines
08.2024 - 06.2025

Project: Linux Infrastructure Enhancement
Clients Supported: FedEx

  • Manage Linux systems administration including installation, configuration, and maintenance of servers supporting client operations.
  • Oversee DNS record creation, modification, and deletion to ensure optimal network service delivery.
  • Perform timely OS patching and updates across managed Linux servers to maintain security and compliance standards.
  • Manage incident and service requests through ServiceNow ticketing system ensuring SLA compliance and quick resolution.
  • Facilitate user account creation for legacy servers outside LDAP integration, ensuring secure access management.

Unix/Linux System Administrator

DXC Technology
09.2019 - 03.2022

Project: Hybrid Unix/Linux System Modernisation
Clients Supported: Macquarie Bank

  • Administer Linux (RHEL) systems, ensuring 24/7 availability for mission-critical applications.
  • Maintain Red Hat Satellite servers, coordinating OS and application updates to reduce security vulnerabilities.
  • Provision and extend file systems to meet application and DBA team requirements, managing storage LUNs effectively.
  • Perform comprehensive OS patching activities and vulnerability management to ensure platform compliance.
  • Collaborate with hardware engineers to diagnose and resolve server and storage hardware issues efficiently.


Unix System Administrator

Eastwest Bank
07.2016 - 08.2019

Project: Bank’s Unix/Linux Core System Stability & Disaster Recovery Implementation
Client: Eastwest Bank (Philippines)

  • Manage Solaris, Linux (SUSE, RHEL), and AIX systems supporting banking operations and services.
  • Conduct OS installations, file system management, and server hardening to improve system security and reliability.
  • Implement and maintain backup agents (Atempo) and monitoring tools across all Unix/Linux platforms.
  • Develop and document disaster recovery (DR) and business continuity procedures used for DR and BCP exercises.
  • Provide operational support, coordinating with application and development teams during system upgrades and deployments.

Unix System Administrator

Hewlett Packard
07.2014 - 07.2016

Project: Enterprise Unix Support for Australian Clients
Clients Supported: Commonwealth Bank of Australia, Downer Group, Bank of Queensland, Westpac, Leighton Holdings, McDonald’s Australia, Origin Energy, Boral

  • Provide Unix/Linux platform support for major Australian clients.
  • Execute OS patching, file system management, and kernel upgrades on AIX, RHEL, Solaris, and HP-UX systems.
  • Assist IBM and HP support engineers with hardware failure diagnostics and server recovery operations.
  • Manage user service requests including account creation, privilege escalation, and access control.
  • Conduct vulnerability patching, proactive server health checks, and backup management to ensure system integrity.

Systems Administrator

United Coconut Planters Bank (UCPB)
01.2011 - 06.2014

Project: Multi-Platform Server Administration & Virtualisation
Client: United Coconut Planters Bank

  • Administer AIX and RHEL base servers including OS installations, upgrades, and performance tuning.
  • Manage DB2 databases and WebSphere application servers on AIX platforms, ensuring high availability.
  • Develop shell scripts for automation of backups, log cleanup, and system maintenance tasks.
  • Configure SAN storage (IBM XIV, DS4700), perform LUN management, and set up network file systems (NFS, Samba).
  • Lead Windows Server administration including Active Directory domain controllers and Microsoft Hyper-V virtualisation.

Desktop Administrator

United Coconut Planters Bank (UCPB)
09.2007 - 12.2010

Client: United Coconut Planters Bank

  • Provide desktop and server support to end-users across the bank’s branches and head office.
  • Assist in installation and configuration of Windows OS and related applications.
  • Manage incident tickets, ensuring timely resolution of hardware and software issues.
  • Coordinate with network and system teams for end-to-end IT support.
  • Maintain documentation for system configurations and standard operating procedures.

Education

Bachelor of Science - Electronics and Comm. Eng’g

TUP-Taguig
01.2006

Electronics Engineering Technology

TUP-Taguig
01.2003

Civil Engineering Technology

TUP-Taguig
01.2001

Skills

  • Enterprise Unix/Linux Systems Administration (Solaris, AIX, HP-UX, RHEL, SUSE)
  • OS Installation, Configuration, Patch Management & Upgrades
  • Storage Management & SAN Zoning (IBM XIV, DS4700)
  • Virtualisation with Microsoft Hyper-V
  • Disaster Recovery & Business Continuity Planning
  • Bash Scripting for Automation
  • Active Directory & Networking (TCP/IP, Samba, NFS)
  • Incident Management & ITIL Best Practices
  • Performance Monitoring & Troubleshooting
  • Client Relationship Management & Cross-Functional Collaboration

Certification

ITIL v3 Certified — March 2015

Timeline

Linux System Administrator

Accenture Philippines
08.2024 - 06.2025

Unix/Linux System Administrator

DXC Technology
09.2019 - 03.2022

Unix System Administrator

Eastwest Bank
07.2016 - 08.2019

Unix System Administrator

Hewlett Packard
07.2014 - 07.2016

Systems Administrator

United Coconut Planters Bank (UCPB)
01.2011 - 06.2014

Desktop Administrator

United Coconut Planters Bank (UCPB)
09.2007 - 12.2010

Electronics Engineering Technology

TUP-Taguig

Civil Engineering Technology

TUP-Taguig

Bachelor of Science - Electronics and Comm. Eng’g

TUP-Taguig
HAREY CEREZO