Staff Systems Administrator (R5995)

Job Description:

What you'll do:

Infrastructure Ownership (On-Prem & Cloud)

Own and operate on-premises and cloud infrastructure, including physical and virtual servers, storage, backup platforms, identity services, core network services, and enterprise applications.

Administer Azure and/or AWS environments with responsibility for availability, capacity, performance, monitoring, secure configuration, backup, and disaster-recovery readiness.

Define technical roadmaps, identify operational risks, and independently drive modernization, standardization, scalability, and resilience improvements.

Maintain accurate architecture diagrams, inventories, operating procedures, recovery documentation, configuration records, and service ownership information.

Plan and execute infrastructure changes using disciplined change, testing, rollback, and post-implementation review practices.

Firewalled Entity and Segmented-Environment Support

Operate technology services for a dedicated legal or operating entity with explicit separation of systems, identities, data, administration, suppliers, and access from other corporate environments where required.

Implement and maintain approved trust boundaries, network segmentation, firewall policies, secure remote access, administrative tiers, and controlled cross-entity connectivity.

Ensure data, devices, accounts, cloud resources, and third-party access remain within authorized entity, contractual, regulatory, and data-residency boundaries.

Partner with Security, Legal, Compliance, Privacy, and corporate IT teams to translate entity-specific obligations into practical controls, operating procedures, and evidence.

Document and periodically validate boundary controls, data flows, privileged access paths, exceptions, and intercompany dependencies; escalate gaps and drive remediation to closure.

Support local business continuity and operational autonomy while aligning with approved global architecture, security standards, and governance.

Security, Compliance, and Systems

Establish, implement, and maintain secure configuration baselines for Windows, macOS, Linux, servers, network devices, cloud services, and endpoint-management platforms using recognized frameworks and vendor guidance.

Own patching and vulnerability-remediation workflows, including asset coverage, risk-based prioritization, remediation timelines, exception documentation, validation, and status reporting.

Administer and validate endpoint protections such as full-disk encryption, EDR/XDR, host firewall, secure boot, application controls, device compliance, removable-media controls, and least-privilege configurations.

Harden identity and administrative access through role-based access control, multifactor authentication, privileged-access separation, conditional access, service-account governance, and periodic access reviews.

Maintain logging, alerting, time synchronization, configuration monitoring, backup protection, and security telemetry needed for detection, investigation, and auditability.

Collect and maintain audit-ready evidence; support internal and external audits, control assessments, security reviews, customer requirements, and remediation plans.

Participate in incident response, containment, recovery, root-cause analysis, and corrective actions for infrastructure and endpoint security events.

Manage technical risks and policy exceptions transparently, including compensating controls, accountable owners, expiration dates, and closure plans.

Identity, Endpoint, and Service Delivery

Administer Active Directory and Entra ID or equivalent identity platforms, including user and group lifecycle, authentication, authorization, federation, and policy enforcement.

Manage Windows, macOS, and Linux endpoints through Intune, Jamf, or equivalent tooling, ensuring secure provisioning, configuration compliance, software deployment, inventory accuracy, and timely retirement.

Lead onboarding and offboarding activities, including device provisioning, access configuration, license assignment, asset recovery, and compliance validation.

Provide advanced troubleshooting and escalation support for employees, engineering systems, lab environments, collaboration services, and secure connectivity.

Own IT asset lifecycle, software licensing, vendor coordination, procurement support, warranty management, and secure equipment disposal.

Use scripting and automation to improve consistency, reduce manual effort, strengthen controls, and provide meaningful operational and compliance reporting.

Contribute reusable infrastructure patterns, standards, and documentation that can scale across comparable international entity environments.

Required qualifications:

12+ years of experience in systems administration, infrastructure engineering, enterprise IT operations, or a closely related discipline.
Demonstrated success independently owning production IT infrastructure and end-user environments in a complex, regulated, segmented, or security-sensitive organization.
Strong hands-on expertise with Windows, macOS, and Linux; server administration and virtualization; Azure and/or AWS; and Active Directory and Entra ID or equivalent identity platforms.
Practical experience implementing system and endpoint hardening, configuration baselines, patch management, vulnerability remediation, encryption, endpoint detection and response, and least-privilege controls.
Experience supporting security or compliance programs and producing evidence for audits, assessments, or customer and regulatory requirements.
Strong networking knowledge, including TCP/IP, DNS, DHCP, VLANs, routing, VPNs, network segmentation, firewall policy, and secure remote access.
Experience with endpoint management platforms such as Intune, Jamf, or equivalent, including compliance policy and device lifecycle management.
Experience implementing and testing monitoring, backup, disaster recovery, and business-continuity capabilities.
Excellent documentation, prioritization, risk communication, and stakeholder-management skills, with the ability to drive outcomes under limited supervision.
Ability to support time-sensitive operational needs and participate in planned after-hours maintenance or incident response when required.

Preferred qualifications:

Experience supporting a firewalled, ring-fenced, subsidiary, joint-venture, sovereign, or otherwise separately governed entity environment.
Experience supporting engineering, R&D, aerospace, defense, manufacturing, or other mission-critical technical teams.
Working knowledge of recognized security and compliance frameworks such as CIS Controls and Benchmarks, NIST, ISO 27001, SOC 2, Cyber Essentials, or equivalent local and contractual standards.
Experience with security tooling such as SIEM, vulnerability-management platforms, privileged-access management, data-loss prevention, certificate management, or network-access control.
Experience supporting isolated, air-gapped, export-controlled, or data-residency-restricted systems.
Scripting and automation experience using PowerShell, Bash, Python, APIs, infrastructure as code, or configuration-management tooling.
Familiarity with GitHub, Azure DevOps, CI/CD environments, and secure engineering workflows.
Relevant certifications such as Microsoft, AWS, VMware, Cisco, CompTIA Security+, CISSP, CISM, GIAC, ITIL, or equivalent.