Senior Systems Administrator

StraitSys Inc

Regular

Position Summary

The Senior Systems Administrator is responsible for the design, administration, security, automation, and operational support of the organization's enterprise Windows server infrastructure, Active Directory, virtualization platforms, and hybrid cloud services. This position serves as the senior technical resource for Microsoft server technologies and provides technical leadership for infrastructure modernization, automation, and operational excellence.

Essential Functions

• Administer Windows Server 2016, 2019, and 2022 environments while preparing for Windows Server 2025.
• Design, administer, and troubleshoot Active Directory in complex multi-domain and multi-forest environments.
• Manage DNS, DHCP, IPAM, DFS, File Services, Print Services, and Active Directory Certificate Services.
• Administer Microsoft Entra ID hybrid identity, Azure AD Connect, Conditional Access, MFA, and PIM.
• Manage Azure Virtual Desktop (AVD), Remote Desktop Services (RDS), Windows 11 Multi-Session, FSLogix, host pools, and image management.
• Develop PowerShell automation, Azure Automation runbooks, and repeatable operational workflows.
• Administer Hyper-V, Azure IaaS, Azure Backup, Azure Site Recovery, and hybrid networking.
• Implement enterprise security controls including Defender, LAPS, BitLocker, Credential Guard, Sentinel, and security baselines.
• Perform advanced troubleshooting using Sysinternals, Event Viewer, PerfMon, ETW tracing, and packet analysis.
• Develop documentation, standards, and operational procedures.
• Mentor junior administrators and provide technical leadership during projects and production incidents.

Required Qualifications

• Bachelor's degree in Information Technology, Computer Science, Engineering, or equivalent experience.
• Minimum seven years of enterprise Windows infrastructure administration.
• Expert knowledge of Windows Server, Active Directory, Microsoft Entra ID, Azure Virtual Desktop, Hyper-V, and PowerShell.
• Active Top Secret Clearance
• Experience supporting hybrid cloud environments and enterprise virtualization.
• Excellent troubleshooting, communication, and documentation skills.

Preferred Qualifications

• Linux administration (Ubuntu, RHEL, or CentOS).
• Docker and Azure Kubernetes Service (AKS).
• Azure services including VNets, NSGs, Azure Monitor, Azure Policy, RBAC, Key Vault, and Infrastructure-as-Code (ARM, Bicep, or Terraform).

Core Competencies

• Enterprise Systems Administration
• Infrastructure Automation
• Technical Leadership
• Operational Excellence
• Root Cause Analysis
• Mentoring
• Continuous Improvement

Success Measures

• High availability of enterprise infrastructure.
• Successful delivery of modernization initiatives.
• Operational efficiency through automation.
• Secure and compliant infrastructure.
• High-quality documentation and knowledge sharing.

PREFERENCE STATEMENT
Preference will be given to Calista shareholders and their descendants and to spouses of Calista shareholders, and to shareholders of other corporations created pursuant to the Alaska Native Claims Settlement Act, in accordance with Title 43 U.S. Code 1626(g).

EEO STATEMENT
Additionally, it is our policy to select, place, train and promote the most qualified individuals based upon relevant factors such as work quality, attitude and experience, so as to provide equal employment opportunity for all employees in compliance with applicable local, state and federal laws and without regard to non-work related factors such as race, color, religion/creed, sex, national origin, age, disability, marital status, veteran status, pregnancy, sexual orientation, gender identity, citizenship, genetic information, or other protected status. When applicable, our policy of non-discrimination applies to all terms and conditions of employment, including but not limited to, recruiting, hiring, training, transfer, promotion, placement, layoff, compensation, termination, reduction in force and benefits.

REASONABLE ACCOMMODATION
It is Calista and Subsidiaries' business philosophy and practice to provide reasonable accommodations, according to applicable state and federal laws, to all qualified individuals with physical or mental disabilities.

The statements contained in this job description are intended to describe the general content and requirements for performance of this job. It is not intended to be an exhaustive list of all job duties, responsibilities, and requirements.

This job description is not an employment agreement or contract. Management has the exclusive right to alter the scope of work within the framework of this job description at any time without prior notice.