HAREY CEREZO

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.

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.

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.

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.

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.

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.