John Aldous Eariel Lim

Experienced IT Infrastructure and System Administrator with over 10 years of expertise in enterprise IT operations, infrastructure support, and systems administration. Skilled in Active Directory, Azure AD, Microsoft 365, Windows Server, DNS, DHCP, Group Policy, VMware, Citrix, and Veeam Backup & Replication. Proven track record in managing global IT environments, supporting end users across APAC and EMEA regions, maintaining system availability, implementing security controls, and resolving complex infrastructure issues.

Strong background in ITIL-based service management, incident response, enterprise monitoring, and identity and access management, with a commitment to delivering reliable and secure IT services.

System Administrator - Quanta Services Inc.

(2025-06)

• Monitor system health, performance, and capacity using enterprise monitoring tools, ensuring high availability and operational reliability.
• Perform Windows Server administration, maintenance, upgrades, troubleshooting, and performance tuning.
• Manage and monitor Veeam Backup & Replication jobs, perform backup validation, restore operations, and support disaster recovery readiness.
• Provide Level 2/3 infrastructure and end-user support, resolving incidents and service requests within SLA targets.
• Manage administrator and service accounts, identity and access management, and security compliance requirements.
• Automate administrative tasks using PowerShell scripting and maintain technical documentation and knowledge base articles.
• Support VMware virtual infrastructure and collaborate with global IT teams to resolve complex operational issues.
• Administer and support enterprise Active Directory environments (Azure AD and On-Prem AD), including DNS, DHCP, GPO, ADFS, MFA, PKI, LDAP, and certificate services.
• Participate in on-call support and incident response activities to ensure continuous business operations.

System Administrator - Steadfast Shared Services

(2023-03 - 2025-06)

• Manage and support end-user devices, providing technical assistance for hardware, software, and peripheral issues.
• Troubleshoot and administer network-related issues and requests, ensuring a robust and secure network environment.
• Ensure seamless operation and security of IT infrastructure, proactively addressing potential issues.
• Perform regular patching activities to maintain system integrity and security.
• Build application distribution packages within the endpoint management toolsets.
• Align with ITILv4 framework and methodologies for incident, service requests, change enablement, availability, monitoring, and event management.
• Troubleshoot and remediate escalated incidents and security vulnerabilities.
• Collaborate with the security team to address vulnerabilities.
• Provide technical guidance and support to junior team members, fostering a collaborative and knowledge-sharing environment.
• Document processes and maintain accurate records of system configurations and changes.

Support Analyst - Santa Fe Relocation

(2018-07 - 2022-01)

• Provided IT support for APAC and EMEA users, both on-site and remotely.
• Managed incident resolution for PC hardware, peripherals, and software (Windows and Mac)
• Administered Windows Server, Active Directory, and Office 365 applications for global operations.
• Managed Office 365 environment, including SharePoint Online management and user administration.
• Managed Global Active Directory across multiple countries, maintaining security and access control.
• Maintained network infrastructure, including firewall configurations, server backups, UPS, and AV management.
• Configured and managed Cisco Meraki devices for enhanced network security and connectivity.
• Handled VPN configurations for secure remote access, including Cisco and SonicWall solutions.
• Prepared and analyzed monthly technical reports for ISO compliance in the Malaysia office.

L1 Infrastructure Engineer - CIMB Bank

(2022-01 - 2023-03)

• Monitored system resources to ensure optimal performance and availability.
• Fulfilled service requests and managed network capacity to maintain high operational efficiency.
• Diagnosed and resolved network issues, ensuring minimal downtime and service disruptions.
• Installed, configured, and maintained hardware/software across the bank's infrastructure.
• Led critical incident response as Incident Commander, mitigating crises and ensuring business continuity.
• Generated and analyzed operational reports to identify trends and improve performance.
• Managed IT asset inventory and ensured compliance with security policies.
• Provided technical support for Microsoft Office 365, Teams, OneDrive, and Intune.
• Administered VPN connectivity for remote users, ensuring secure and seamless access.
• Handled ticket management through OTRS, improving response time and issue resolution.
• Develop end-user and technical documentation, ensuring accessibility and clarity.
• Administer Entra ID, Microsoft 365 suite of tools (including Exchange, SharePoint, Teams, and Enterprise Applications), Jira, Jamf, and Slack.
• Implement and support enterprise applications to leverage single sign-on and cross-domain identity management (SCIM).
• Develop and build file transfer automation and workflows within the Managed File Transfer solutions.
• Administer and support the Citrix Virtual Apps and Desktop environments, ensuring seamless virtual desktop experiences.

Desktop Support Specialist / Field IT - Shearwater Health

(2014-11 - 2018-07)

• Provided onsite troubleshooting for desktop, laptop, and network-related issues, ensuring smooth business operations.
• Installed and configured software applications, including Microsoft Office 365/2016, Citrix, VMware, VPN, and other client tools.
• Performed OS installations and system reformatting using bootable devices and Windows Deployment Services.
• Installed, configured, and troubleshot various Citrix applications, VPNs, and other enterprise software.
• Managed McAfee ePO, deploying security products (AV, DLP, proxy, encryption/decryption) to ensure data protection.
• Administered Active Directory, handling user accounts, permissions, and group policies.
• Configured and maintained File Servers for efficient data access and security.
• Installed and managed both network and local printers to ensure seamless office operations.
• Conducted basic network troubleshooting, diagnosing and resolving connectivity and performance issues.
• Configured and troubleshot Avaya softphones, ensuring optimal VoIP communication.
• Ensured all site computers remained updated with the latest Windows and McAfee security patches.
• Managed IT support tickets through a web-based ticketing system, improving issue tracking and resolution times.
• Provided end-user support via phone and email, ensuring effective communication and issue resolution.
• Created and maintained hardware and software inventory records for accurate asset management.
• Generated reports and documentation for IT operations, compliance, and internal audits.

Content Editor - SPi Global

(2013-06 - 2014-11)

• Updating SGML/XML files for Australian legal documents, ensuring accuracy and compliance.
• Generated and formatted legal documents into PDF for online publication.
• Analyzed client instructions and applied accurate coding to maintain document integrity.
• Communicating with clients via email to clarify instructions and ensure deliverable quality.

Technical Support (Intern) - Amkor Technology

(2012-11 - 2013-03)

• Provided troubleshooting support for desktops and laptops.
• Performed software installations and troubleshooting.
• System reformatting to optimize device performance.
• Creating technical reports documenting IT issues, resolutions, and system updates.

Bachelor of Science - Information Technology - Polytechnic University of the Philippines (2009 - 2013)