Windows Systems Engineer

STN Inc; Pleasanton (CA); On-site; USD 175,000 - 195,000; Full time

Benefits offered by this job

Health Coverage – Medical, Dental &amp

Vision

Job summary

STN Inc. seeks a Systems Engineer to own day-to-day health, security, and lifecycle of Windows Server, Active Directory, and Microsoft 365 for managed-services customers.

You will administer servers, AD upgrades, and certificate lifecycle, author PowerShell automation, and manage 365/Entra ID including Exchange Online. Strong patching discipline and multi-customer communication are key.

Qualifications

• 5+ years hands-on with Windows Server and Active Directory.
• Experience with DNS, DHCP, and Group Policy administration.
• Ability to script with PowerShell and automate tasks.
• Experience with PKI, AD CS, or certificate lifecycle.
• Knowledge of security, patching, MFA, and CA concepts.
• Experience with PCI/HIPAA regulated environments.
• Microsoft 365 and Entra ID administration including Exchange Online.
• Virtualization experience with VMware vSphere or Hyper-V.

Responsibilities

• Administer Windows Server environments across multiple customer sites.
• Plan and execute Active Directory domain upgrades and topology changes.
• Develop and maintain PowerShell scripts for provisioning and automation.
• Manage Microsoft 365, Entra ID, and Exchange Online configurations.
• Own patch cadence and endpoint protection, address vulnerabilities.
• Support MFA/Conditional Access rollouts and identity hygiene.
• Monitor backups and run test restores, ensure RPO/RTO targets.
• Maintain runbooks and documentation for multi-customer environments.
• Act as L3 escalation point for service desk and drive root-cause analysis.

Skills

Windows Server

Active Directory

DNS/DHCP

Group Policy

PowerShell

Security & patching

Microsoft 365

VMware/Hyper-V

Education

Bachelor's degree in IT

Tools

Cohesity

Veeam

Intune

SCCM/MECM

NinjaOne

Datto

Nessus

Qualys

Job description

The Systems Engineer owns the day-to-day health, security, and lifecycle of the Windows Server, Active Directory, and Microsoft 365 environments that STN operates for its managed-services customers.

Key Responsibilities

• Administer Windows Servers across multiple customer environments, including DNS, DHCP, Group Policy, file and print services, and certificate services

• Plan and execute Active Directory work — domain controller upgrades, promotion and demotion, OS and functional-level upgrades, replication troubleshooting, and site and topology changes — from a documented plan

• Write, debug, and maintain PowerShell for provisioning, reporting, bulk changes, and remediation, converting repeat manual work into reusable, reviewed automation

• Administer Microsoft 365 and Entra ID: Exchange Online, mail flow and transport rules, licensing, mailbox moves and migrations, group and identity management, and Conditional Access policy

• Own patch cadence across servers and endpoints, maintain endpoint protection coverage, and remediate vulnerability scan findings against agreed timelines

• Support MFA and Conditional Access rollouts and maintain identity hygiene, including privileged account control, stale object cleanup, and access reviews

• Monitor backup and replication jobs, run and evidence test restores, and escalation failures against RPO and RTO commitments

• Build, standardize, and retire Windows servers across virtualization and cloud IaaS, including image standards and capacity planning

• Operate the VMware vSphere or Hyper-V estate: host and cluster health, VM lifecycle and sizing, snapshots, datastore capacity, and hypervisor patching within approved maintenance windows

• Act as the L3 escalation point for the service desk, drive root-cause analysis on recurring incidents, and feed fixes back into runbooks

• Follow change management for all infrastructure work: risk assessment, maintenance windows, rollback plans, and post-change validation

• Maintain runbooks, architecture and identity documentation, and configuration records, keeping customer-specific detail current

• Produce and maintain evidence for PCI and HIPAA reviews, including patch reports, restore tests, access reviews, and configuration baselines

Experience & Qualifications

Required

• 5+ years hands-on with Windows Server and Active Directory, covering DNS, DHCP, and Group Policy administration

• Demonstrated ability to run a domain controller promotion or upgrade independently from a documented plan, including pre-checks, replication validation, and rollback

• Certificate management experience: AD CS or another internal PKI, public SSL/TLS certificate lifecycle, and the renewal and expiry discipline that keeps customer services from failing on an expired certificate

• PowerShell proficiency at the level of writing and debugging scripts, not only running scripts written by others — or equivalent automation depth in another tool (Python, Ansible, or Terraform) alongside working PowerShell

• Working command of security and patch hygiene: patch cadence, endpoint protection, MFA and Conditional Access concepts, and the ability to read a vulnerability scan and act on it

• Experience supporting PCI- and/or HIPAA-regulated customer environments and the change control and evidence discipline they require

• Microsoft 365 and Entra ID administration, including Exchange Online, mail flow, licensing, mailbox moves, and Conditional Access

• Backup and restore operations: job monitoring, test restores, and failure escalation — Cohesity or Veeam preferred, though the operational discipline matters more than the specific product

• Hands‑on virtualization experience with VMware vSphere or Hyper-V, including host and cluster operations, VM provisioning, snapshots, and resource management

• Clear written communication and documentation habits suited to a multi-customer environment

• Bachelor's degree in information technology, computer science, or equivalent experience

Preferred

• Experience in an MSP, MSSP, or multi‑tenant hosting environment supporting several customers concurrently

• Azure IaaS or Azure Virtual Desktop experience alongside on‑premises virtualization

• Endpoint and patch management platforms such as Intune, SCCM/MECM, or an RMM such as NinjaOne or Datto

• Vulnerability management tooling (Nessus, Qualys, or Rapid7) and Microsoft Defender for Endpoint or Defender for Office 365

• Experience with RMM, PSA, or ITSM platforms such as NinjaOne, ConnectWise, HaloPSA, Jira Service Management, or ServiceNow

• Hybrid identity experience including Entra Connect, tenant‑to‑tenant migrations, and Windows Server 2022/2025 upgrade cycles

• Familiarity or working knowledge of using AI coding tools such as Claude or OpenAI to accelerate scripting and troubleshooting

• Certifications such as AZ-104, MS-102, SC-300, AZ-800/801, CompTIA Security+, or MCSA/MCSE

Compensation

• Full-Time, Exempt

• $175,000-$195,000/year, DOE

Benefits

• Health Coverage – Medical, Dental & Vision

• FSA Health and Dependent Care available

• 401(k) Plan

• Unlimited Paid Time Off (PTO)

• Observed Holidays Paid

• Cell Phone Allowance

• Collaborative, growth-driven culture