Senior Windows Server Administrator

Optum is a global organization that delivers care, aided by technology to help millions of people live healthier lives. The work you do with our team will directly improve health outcomes by connecting people with the care, pharmacy benefits, data and resources they need to feel their best. Here, you will find a culture guided by inclusion, talented peers, comprehensive benefits and career development opportunities. Come make an impact on the communities we serve as you help us advance health optimization on a global scale. Join us to start Caring. Connecting. Growing together.

Primary Responsibilities:

• Design, Implementation & Operational Support of Windows 2012/2016/2019/2022 Servers
• Working knowledge of CentOS / RHEL OS platforms
• Monitoring and troubleshooting server performance. Troubleshooting system and server errors. Reviewing system error logs and user-reported errors. Analyzes, logs, tracks, and resolves software/hardware matters of significance pertaining to networking connectivity issues, servers, and applications to meet business needs
• Performs troubleshooting to isolate and diagnose common system problems documents system events to ensure continuous functioning. Recommends course of action and implements as approved
• Patch management, installations of security patches, functional patches, and version upgrades to server and vSphere / ESXi environment
• Oversee Citrix environments, including setup, configuration, and maintenance of Citrix servers and applications
• Automate system administration tasks using PowerShell and other scripting tools
• Plan and execute system migrations, ensuring minimal downtime and robust data integrity
• Maintain and troubleshoot hyper-converged infrastructure (HCI) to support business operations
• Handle server hardware installation, upgrades, and maintenance
• Collaborate with cross-functional teams to design and implement IT solutions that meet organizational needs
• Implement and enforce system security, patch management, and compliance standards
• Provide timely support for escalated technical issues and participate in on-call rotations
• Comply with the terms and conditions of the employment contract, company policies and procedures, and any and all directives (such as, but not limited to, transfer and/or re-assignment to different work locations, change in teams and/or work shifts, policies in regards to flexibility of work benefits and/or work environment, alternative work arrangements, and other decisions that may arise due to the changing business environment). The Company may adopt, vary or rescind these policies and directives in its absolute discretion and without any limitation (implied or otherwise) on its ability to do so

Required Qualifications:

• 10 years of experience in Window Server administration
• 10 years of experience in Linux Servers Administration
• 10 years of experience in virtualization technologies such as VMware, Nutanix, and Citrix
• Proven track record in system migrations and upgrades
• Solid experience and technical knowledge in hyper-converged infrastructure management
• Work experience in high availability and clustered environment configuration
• Expertise in Experience in general client networking and protocols, manage and troubleshoot AD/DNS/DHCP/DFS issues
• Proficient in controlling administrator rights on VM Infrastructure, Use of VMware Converter Enterprise, and overview.
• Technical knowledge in vCenter and ESXi, Aria Operations 8.X, vSAN, VMware Aria Operations for logs 8.x, VMware vSphere 7.x.
• Solid experience in Windows Servers patching and troubleshooting
• Experience on Server builds and decommission, Commission / Decommission of Domain Controllers. VMware Distributed Resources Scheduler (DRS) cluster, Resource Management, Resource Monitoring
• Experience in server certificate administration, SSL/TLS protocols and algorithms, HTTP/HTTPS, etc
• Experience in enterprise load balancing administration using F5, Citrix ADS (aka Netscaler), etc
• Experience in server antivirus administration and troubleshooting using Cylance, Microsoft Defender/Sentinel, CrowdStrike, etc.
• Hands on experience in performance tuning of ESXi host. Implement Hardening on ESXi host. Experience in P2V, vMotion, and VMware virtual center
• Experience in Commission / Decommission of ESXi Host hosted on various hardware like Dell, HP, Cisco UCS Blade Centers
• Experience on configuration of HA and DRS features in a cluster and troubleshooting
• Experience in configuring VMware vSphere iSCSI & Fiber Channel storage and troubleshooting
• Experience on P2V and V2V migrations
• Excellent troubleshooting skills with the ability to analyze complex problems efficiently
• Skilled and knowledgeable in server hardware maintenance and troubleshooting
• Ability to mentor, Motivate and Manage the team members to optimally support and resolve time-sensitive incidents, problems and escalations
• Knowledge of networking concepts, system security practices, and ITIL frameworks
• Proven excellent problem-solving, communication, and teamwork skills
• Proficiency in English (Written & Verbal) Language

At UnitedHealth Group, our mission is to help people live healthier lives and make the health system work better for everyone. We believe everyone - of every race, gender, sexuality, age, location and income - deserves the opportunity to live their healthiest life. Today, however, there are still far too many barriers to good health which are disproportionately experienced by people of color, historically marginalized groups and those with lower incomes. We are committed to mitigating our impact on the environment and enabling and delivering equitable care that addresses health disparities and improves health outcomes - an enterprise priority reflected in our mission.

Optum is a drug-free workplace. 2025 Optum Global Solutions (Philippines) Inc. All rights reserved.