Senior Systems Administrator

MaxCyte, Inc•Rockville, MD

11h

About The Position

We are seeking an accomplished Senior Systems Administrator to serve as a senior technical resource within our IT organization. This role owns the design, administration, and continuous improvement of our enterprise IT infrastructure including on-premises systems, cloud environments, identity platforms, cybersecurity operations, and core network services. The ideal candidate brings deep technical breadth, a strong security mindset, leadership through influence, and the maturity to operate independently on complex, high-impact initiatives while mentoring the broader IT team.

Requirements

6+ years of progressive IT infrastructure and systems administration experience with demonstrated senior-level ownership
Expert-level proficiency in Windows Server (2016/2019/2022): Active Directory, Group Policy, DNS, DHCP, DFS, and certificate services
Advanced Microsoft Azure administration: Entra ID, Intune, Defender, or equivalent cloud security platform
Deep expertise in VMware vSphere (vCenter, ESXi, vSAN) or Microsoft Hyper-V at scale
Strong networking skills: routing, switching, VLANs, BGP/OSPF fundamentals, firewall policy management, VPN, and SD-WAN
Proven PowerShell scripting and automation capabilities
Demonstrated experience leading infrastructure projects and mentoring junior IT staff
Strong written communication skills and ability to produce clear technical documentation

Nice To Haves

Microsoft Certified: Azure Administrator Associate (AZ-104) or Azure Solutions Architect Expert (AZ-305)
VMware Certified Professional (VCP-DCV) or equivalent
CompTIA Security+ or equivalent security certification
Microsoft Certified: Identity and Access Administrator (SC-300) or Security Operations Analyst (SC-200)
Experience with SIEM platforms such as Microsoft Sentinel or Splunk
Familiarity with Zero Trust architecture principles and implementation
Experience with infrastructure-as-code tools such as Terraform, Bicep, or Ansible
ITIL v4 Foundation or Managing Professional certification

Responsibilities

Serve as the senior technical authority for all enterprise infrastructure including Windows Server, Linux, virtualization, storage, and backup systems
Design, implement, and maintain scalable, highly available infrastructure architecture across on-premises and cloud environments
Lead infrastructure projects from architecture through deployment: hardware refreshes, data center operations, cloud migrations, and platform upgrades
Establish and enforce infrastructure standards, naming conventions, and configuration baselines across all managed systems
Own capacity planning, lifecycle management, and technology roadmap input for infrastructure platforms
Serve as the senior administrator for Microsoft Azure/Entra ID including hybrid identity, SSO, MFA, Conditional Access, and Privileged Identity Management (PIM)
Manage and optimize the Microsoft 365 tenant at an advanced administrative level: Exchange Online, SharePoint, Teams, Intune, and Microsoft Defender
Lead cloud strategy execution including IaaS/PaaS adoption, cloud cost governance, and architecture decision-making
Design and maintain network security architecture: firewall rules, VLANs, SD-WAN, VPN, and Zero Trust network access principles
Work with IT leadership on enterprise cybersecurity operations programs including EDR, SIEM, vulnerability management, and incident response
Lead patch management strategy and execution across all endpoints, servers, and network devices
Work with IT leadership conducting regular security assessments and drive remediation of identified vulnerabilities
Develop and maintain security policies and procedures aligned with NIST CSF or equivalent frameworks
Support internal audits, external assessments, and regulatory inquiries from an IT infrastructure perspective
Provide technical mentorship and day-to-day guidance to the IT Support Specialist team
Conduct architecture reviews for infrastructure changes proposed by junior staff
Develop and maintain comprehensive technical documentation including architecture diagrams, runbooks, SOPs, and change logs
Lead root cause analysis (RCA) for major incidents and drive post-incident reviews and remediation
Serve as the primary IT operational decision-maker in the IT Director’s absence
Develop and maintain PowerShell and scripting solutions to automate repetitive administrative tasks, reporting, and compliance checks
Identify and drive opportunities to improve IT operational efficiency and strengthen security posture
Evaluate and recommend emerging technologies to IT leadership with well-reasoned business cases
Manage strategic vendor relationships for infrastructure, cloud, and security services