Systems Administrator

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FT Salary Full-Time Professional Houston, TX, US

11 days ago Requisition

Who we are:

Manhattan Life 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 Manhattan Life’s enduring history, and an indicator of the reliability of our future. Manhattan Life’s headquarters are in Houston, TX and the company is continually growing with multiple office locations nation-wide.

Manhattan Life 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.

• 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 , 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 Power Shell, 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…