Senior System Administrator (On-Site)

Neumo; Fairfield, Northern (CA, KY); Hybrid; USD 115,000 - 140,000; Full time

Job summary

Neumo seeks a Senior System Administrator to lead day‑to‑day operations of on‑premises and cloud infrastructure in a large public sector environment. The role requires expert Microsoft Azure experience, strong Windows Server knowledge, and mastery of Active Directory, DNS, PKI, MECM/SCCM, and Entra ID.

You will maintain security, documentation, and cross‑functional collaboration while supporting multiple data centres.

Qualifications

• Requires at least one of: Computer Science Degree, MCP or equivalent Windows Server/Azure certs.
• 6+ years of experience in a similar position or equivalent mix of education/experience.

Responsibilities

• Respond to daily service requests and incident tickets via ServiceNow.
• Communicate clearly with users and stakeholders at all levels; troubleshoot and resolve issues.
• Manage on‑premises and cloud compute/storage; ensure SLAs and QoS targets.
• Lead multiple projects from design through implementation; oversee hardware/software lifecycle.
• Create system topology diagrams and maintain technical documentation.

Skills

Microsoft Azure

Active Directory

DNS

PKI

MECM/SCCM

Intune MDM

Azure AD/Entra ID

Windows Server

VMware ESXi

Cisco UCS

HyperConverged infrastructure

ServiceNow

ITIL

Communication

Education

Computer Science Degree

MCP

Tools

VMware vSphere

HX OpenStack?

Visio

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.

Senior System Administrator (On-Site)

Full Time Fairfield, CA, US

2 days ago Requisition ID: 2663

Salary Range: $115,000.00 To $140,000.00 Annually

Job Summary:

This is a senior-level technical role requiring extensive hands‑on experience in systems administration and deep expertise in network operating systems. The ideal candidate will have ”expert” level experience with Microsoft Azure, and strong working knowledge of Server OS, Active Directory, DNS, PKI, Microsoft Endpoint Configuration Manager, server monitoring, M365, Entra ID, and Azure cloud administration.

As a technology leadership position, it demands a high level of practical proficiency in both Windows Server environments and Azure cloud services. Solano County’s network spans six cities, four data centres, multiple branch locations, and two Azure tenants.

In collaboration with other team members, this position will be responsible for the day‑to‑day operation, support, and security of the County’s compute, storage, and cloud infrastructure. Our on‑premises environment is primarily built on Cisco UCS and HyperFlex (HX) platforms, so recent experience with converged or hyperconverged virtualization systems is essential.

Please note that this position requires passing a California Law Enforcement Telecommunications (CLETS) background check, and authorization to work in the United Stats (see below for specifics)

• Responding to daily service requests and incident tickets through the ServiceNow platform.
• Communicating clearly and effectively with users and stakeholders at all technical levels, from end users to executive leadership.
• Applying strong diagnostic and problem‑solving skills to troubleshoot issues and implement effective solutions.
• Responding promptly to service outages, identifying and analysing root causes, and restoring services to ensure efficient and reliable operations.
• Managing on‑premises and cloud infrastructure to ensure service‑level agreements (SLAs) and quality‑of‑service (QoS) targets are consistently met.
• Managing multiple projects simultaneously, from initial design through full implementation.
• Overseeing all lifecycle stages of compute and storage hardware/software, including deployment, testing, maintenance, upgrades, refresh cycles, and decommissioning.
• Supporting critical outages and participating in after‑hours incident response as required, including rotation in a team‑wide on‑call schedule.
• Creating and maintaining system topology diagrams using Visio or similar tools.
• Producing clear, accurate, and maintainable technical documentation within the ServiceNow knowledge base.
• Managing asset inventory for compute and storage equipment.
• Collaborating with various IT service towers to resolve complex issues and support cross‑functional projects.
• Perform other duties as assigned

Education and Experience:

• At least one of the following certifications: Computer Science Degree, MCP or equivalent role‑based certifications in Windows Server, Microsoft Office 365 or Microsoft Azure
• 6+ years of experience in a similar position and/or any combination of education and experience that clearly demonstrates the ability to perform the job duties of the position.

Technical Skills & Expertise:

• Expert level of experience and understanding of Microsoft Azure
• Expert level of experience in Active Directory Domain Services, to include FSMO roles, AD Functional Level upgrades, Domain Trusts, AD Site & Subnets, DFS & SYSVOL replication, GPO optimisation, ADMX upgrades, LDAP queries, Dynamic DNS, SPNs, ICACLs, etc..
• High level of expertise in Entra ID / Azure AD, to include Entra Connect, SAML & OIDC SSO, Conditional Access policies, Privilege Identity Management, PIV and FIDO2 Smartcard, etc..
• Expert working knowledge of Microsoft 365 Services to include Exchange Online, SharePoint, OneDrive, MS Teams, Dynamics, Power BI, etc..
• Expert working knowledge of Microsoft Exchange up to and including Exchange 2019/SE
• Experience with Packet capturing and protocol analysis (TCP, UDP, ICMP, packet dissection).
• Excellent knowledge and experience with Azure cloud services in IaaS, PaaS and SaaS scenarios.
• Hands on experience with Azure Identity

Knowledge, Skills and Abilities:

• Strong working knowledge of Microsoft PKI, Certificate Authorities, Templates, CRL etc..
• Hands on knowledge working with VMWare vSphere and VMWare ESXi hosts.
• Hands on experience working with Cisco UCS platform, including UCSM and HX connect.
• Working knowledge of Microsoft Endpoint Configuration Manager (MECM/SCCM) and Intune MDM hybrid device management.
• Very strong focus on Information Security & Compliance best practice
• Well-versed in ITIL concepts for ITSM and ITOM.
• Strong problem‑solving and troubleshooting skills
• Excellent communication skills across technical and non‑technical audiences
• Curiosity about new technologies and creativity in approach to problem‑solving
• Ability to manage multiple priorities and lead high‑impact projects.
• Excellent documentation and diagramming skills (Visio).
• Collaborative and adaptable in a fast‑paced environment.
• Ability to work independently and in a team environment.
• The noise level in the work environment is usually moderate as the employee works in an office setting, at an individual workstation, using telephone and computer

Physical Demands:

• Must be able to remain in a stationary position for most of the day.
• Constantly operates a computer and other office productivity machinery, such as a printer/copy machine.
• This position needs to occasionally move about inside the office.
• The person in this position frequently communicates via telephone, virtual meetings and calls and Teams chat messages.

With the backing of four decades of public sector expertise and corporate capability, Neumo has successfully supported government services. Neumo was honoured and recognised for four (4) consecutive years as a GovTech 100 Company representing the top 100 companies focused on making a difference in and selling to state and local government agencies across the United States.

Neumo is committed to helping communities thrive and brings a wealth of experience combined with innovation. Today, Neumo offers more administrative and financial support to government officials than any other organisation. And with a responsive, client‑focused approach, we foster partnerships that give our customers the certainty they need to accomplish more.

Neumo offers a competitive benefits and compensation package and are looking for team members who will thrive in our dynamic environment.

Neumo is an Equal Opportunity Employer. Selection for a position will be made without regard to race, religion, national origin, sex, political affiliation, marital status, non‑disqualifying physical handicap, and age.