Systems Administrator

ManhattanLife Insurance & Annuity Company; Houston (TX); On-site; USD 85,000 - 110,000; Full time

Job summary

ManhattanLife Insurance & Annuity Company seeks a Senior Systems Administrator to own on-premises infrastructure and integrate cloud services. You will manage Windows and Linux servers, Active Directory, Azure, and security controls, with hands-on responsibility for migrations, testing, and stabilization.

Expect collaboration across IT teams and a focus on secure, repeatable deployments. The role emphasizes design through deployment, robust documentation, and mentorship, with a practical

Qualifications

• Five+ years of hands-on production infrastructure experience or equivalent.
• Experience administering Windows Server, AD, DNS, DHCP, and Exchange Online.
• Experience with Linux server administration, patching, monitoring and troubleshooting.

Responsibilities

• Design and implement on-premises infrastructure from requirements to deployment and stabilization.
• Configure, test, and place Windows/Linux servers and virtualization into production.
• Lead migrations, upgrades, and office integrations with documented rollback plans.
• Automate deployments, health checks, and reporting using PowerShell, Bash, or Azure CLI.

Skills

Windows Server

Active Directory

Azure

VMware

PowerShell

Education

High School degree or equivalent

Tools

VMware vSphere

Azure CLI

Bash

Terraform

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

Systems Administrator

FT Salary Full-Time Professional Houston, TX, US

11 days ago Requisition ID: 1825

Who we are:

ManhattanLife Insurance and Annuity Company was founded in 1850, the Company’s longevity makes it one of the oldest and most reliable health and life insurance companies in the country. Operating successfully for over 175 years is a testimony to ManhattanLife’s enduring history, and an indicator of the reliability of our future. ManhattanLife’s headquarters are in Houston, TX and the company is continually growing with multiple office locations nation-wide. ManhattanLife offers attractive employee benefits starting day one, including immediate coverage under our health, dental and vision plans. We offer flexible schedules, including shortened hours on Fridays, free parking, company-wide events, professional development (LOMA testing) and a company-wide wellness program.

Scope and Purpose:

This onsite Houston role is for a Senior Systems Administrator who builds, secures, and owns on-premises infrastructure and integrates cloud services. The scope includes Windows, Linux, Microsoft 365, Azure, identity, virtualization, networking, backup, and security. Senior, hands-on MSP experience is valued, alone or combined with broad enterprise experience. Comparable enterprise-only implementation experience is welcome.

This hands-on role owns infrastructure from design through deployment or migration, testing, documentation, and stabilization. Candidates should explain systems they personally built or redesigned and the decisions they owned. Infrastructure fundamentals, security judgment, and ability to learn matter more than knowing every product.

Duties and Responsibilities:

• Infrastructure Design & Implementation:
  • Administer Translate business and technical requirements into practical designs, implementation plans, dependencies, change records, validation steps, rollback plans, and support documentation.
  • Personally configure, integrate, test, and place into production on-premises Windows and Linux servers, virtualization, storage, backup, identity services, monitoring, security controls, and Cisco or Meraki networks.
  • Lead and execute greenfield deployments, migrations, major upgrades, platform replacements, and office integrations through post-implementation validation and stabilization.
  • Establish secure, repeatable deployment standards, templates, and automation, then transition completed systems into documented operational ownership.
• Systems, Cloud & Identity:
  • Implement and administer Windows Server, Group Policy, DNS, DHCP, file services, permissions, and authentication.
  • Implement and administer enterprise Linux, including access, patching, monitoring, troubleshooting, and availability.
  • Evaluate and integrate Azure services based on business needs, security, reliability, operational effort, and cost; use managed services where appropriate.
  • Implement and administer Active Directory and Entra ID, including MFA, Conditional Access, SSO, federation, identity lifecycle, RBAC, least privilege, and privileged access.
  • Administer Microsoft 365 services, including Exchange Online, collaboration, security, compliance, retention, and auditing.
  • Implement approved SaaS solutions, configuring SSO, SCIM-based provisioning and deprovisioning, RBAC, and audit logging where supported; document configurations and operational ownership.
  • Automate deployments, configuration, health checks, and reporting with PowerShell, Azure CLI, Bash, APIs, or comparable tools.
• Networking, Security & Resilience:
  • Implement and support Cisco, Meraki, or comparable firewalls, switches, wireless networks, VPNs, WAN links, and management platforms.
  • Troubleshoot TCP/IP, routing, switching, DNS, DHCP, VLANs, segmentation, remote access, and ISP connectivity.
  • Implement firewall rules, network segmentation, VPNs, and access controls through documented and approved changes.
  • Apply security best practices for hardening, patching, MFA, privileged access, endpoint protection, logging, and vulnerability remediation.
  • Support and test backup, restore, replication, and disaster recovery; partner with Security on incident response, audits, and remediation.
• Operations, Documentation & Projects:
  • Own incidents and problems through diagnosis, communication, root-cause analysis, resolution, and durable correction.
  • Use ITSM, RMM, alerting, and documentation platforms with the discipline expected in a mature MSP or enterprise environment.
  • Maintain accurate architecture diagrams, CMDB and inventory records, build standards, runbooks, knowledge articles, and operating procedures.
  • Serve as an escalation point and technical mentor for HelpDesk and support teams.
  • Plan and deliver infrastructure projects with business teams, vendors, and technology partners.

Minimum Qualifications:

These qualifications describe the work, not a rigid checklist. Candidates with comparable experience are encouraged to apply.

• High School Graduate, GED, or equivalent practical experience.
• Typically five or more years of hands-on production infrastructure experience; demonstrated capability and breadth matter more than a precise year count.
• Examples of production infrastructure personally designed and built from requirements through deployment, documentation, validation, and stabilization.
• Broad implementation, administration, and troubleshooting experience across multiple infrastructure domains.
• Experience managing tickets, priorities, changes, documentation, and escalations in a production environment.

Knowledge, Skills and Abilities:

• Deep expertise in at least one infrastructure discipline, with the range and judgment to design and troubleshoot beyond it.
• Practical knowledge of secure configuration, least privilege, layered controls, patching, recovery, and change management.
• Ability to evaluate design tradeoffs, identify dependencies and risks, plan validation and rollback, and execute with limited step-by-step direction.
• Ability to balance incidents, projects, security remediation, and lifecycle work with clear ownership and communication.
• Strong documentation and communication skills, with a practical approach to standardization, automation, and operational improvement.

Preferred Experience:

• These experiences strengthen a candidate’s fit. Comparable hands-on implementation experience can be considered.
  • Senior, hands-on MSP experience, alone or combined with broad enterprise experience, with ownership of production builds, migrations, upgrades, and complex troubleshooting. Comparable enterprise-only experience with broad, end-to-end implementation responsibility is welcome.
  • Hands-on experience implementing, integrating, and troubleshooting infrastructure across server, network, identity, cloud, and security domains.
  • Automation,infrastructureascode,standardization,monitoringimprovements,oreliminationofrecurringmanualwork.
  • Experience supporting regulated environments, HIPAA or PCI controls, audits, M&A integrations, or relevant technical certifications.

Preferred Technology Experience:

• Windows Server, Active Directory, Group Policy, DNS, DHCP, Entra ID, Microsoft 365, Intune/Autopilot and Exchange Online. Azure architecture, hybrid integration, governance, security, and cost management.
• Enterprise Linux, including Red Hat, Rocky Linux, CentOS, Ubuntu, or comparable distributions.
• VMware vSphere, vCenter, ESXi, high availability, storage, and Veeam.
• Cisco Secure Firewall (Firepower), ISE, Meraki, Secure Endpoint, Umbrella, Secure Email, Secure Client (AnyConnect), ThousandEyes, and Duo.
• ConnectWise Manage or Automate, IT Glue, or comparable ITSM, RMM, and documentation tools.
• PowerShell, Azure CLI, Bash, APIs, Bicep, Terraform, or comparable automation tools.

Travel Requirements:

This position may require light travel within a ten-mile radius from one office location to another as needed within the Houston area.

Professional Development:

• Set annual professional development goals and participate in the evaluation process.
• Maintain current knowledge of relevant infrastructure, cloud, networking, automation, and security technologies.

Physical Demands:

The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job. Reasonable accommodations may enable individuals with disabilities to perform essential functions. While performing the duties of this job, the employee is regularly required to stand; walk; use hands to finger, handle or feel objects, type, and use mouse; reach with hands and arms and talk and/or hear. The employee is required to sit for extended periods of time. The position may require lifting, pulling or moving items weighing upwards of10 pounds as it relates to office or desk supplies.

Work Environment:

The work environment characteristics described here are representative of those an employee encounters while performing the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform essential functions. While performing the duties of this job, the employee regularly works in an office environment. This role routinely uses standard office equipment such as computers, phones via WebEx, physical phone while in office, and photocopiers when necessary.

Other Duties:

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Nothing in this job description restricts management’s right to assign or reassign duties and responsibilities to the job at any time without notice.

AAP/EEO Statement:

ManhattanLife prohibits discrimination based on race, religion, gender, national origin, age, disability, veteran status, marital status, pregnancy, gender expression or identity, sexual orientation, or any other legally protected status. EOE Employer/Vet/Disabled. ManhattanLife values differences. We are committed to fostering an environment that attracts and retains a diverse workforce. With individuals from a variety of backgrounds, ManhattanLife will be better equipped to service our customers, increase innovation, and reduce risks. We encourage the unique perspectives of individuals and are dedicated to creating a respectful and inclusive work environment.