Top Systems Administrator Jobs in Los Angeles, CA

Administer and optimize enterprise Windows and Linux infrastructure, virtualization, cloud platforms, networks, storage, security, endpoints, identity systems, and disaster recovery. Monitor performance, resolve infrastructure issues, maintain compliance controls, document systems, support technical escalations, and lead upgrades, migrations, and deployments. The role requires independent management of complex environments and strong communication with technical and non-technical stakeholders.

Administers enterprise infrastructure across Windows servers, endpoints, identity, networks, security platforms, virtualization, and backup/DR. Responsibilities include Active Directory administration, server hardening and patching, endpoint protection, firewall and VPN support, VMware operations, backup verification, compliance with NIST 800-171/CMMC practices, change management, documentation, and Tier 2/3 support. The role requires collaboration with cybersecurity and infrastructure teams and may involve occasional onsite, evening, or weekend work.

Supports Salesforce and other business systems through user administration, troubleshooting, data imports and cleanup, process automation, documentation, training, and system improvements. The role collaborates cross-functionally to resolve requests, improve operational efficiency, maintain data quality, and support user adoption. It also includes ongoing Salesforce learning and progress toward Salesforce Administrator certification.

Administer endpoint security, patching, software deployment, Microsoft Intune, Windows systems, Active Directory, Entra ID, email accounts, and network environments supporting more than 1,000 users and endpoints. Monitor and remediate security threats, manage compliance and inventory, troubleshoot enrollment and device issues, build Windows images, produce operational reports, document procedures, and collaborate with IT teams to improve security and technology operations.

Lead and support systems engineering for cloud-based enterprise systems across architecture, integration, testing, deployment, sustainment, and modernization. Develop technical baselines and architecture documentation, coordinate cloud and cybersecurity integrations, support configuration management and RMF activities, analyze risks and system performance, maintain Splunk security dashboards, execute vulnerability scans, implement STIGs, and provide technical recommendations and reports to stakeholders.

Own strategy, architecture, configuration, integrations, and optimization for G&A and Finance business systems. Serve as product owner by defining roadmaps, prioritizing features, managing system lifecycles, evaluating solutions, and delivering AI use cases. Partner with business leaders, improve processes, document system flows, establish configuration standards, and drive adoption, reliability, and compliance across the enterprise systems environment.

Maintains and manages servers, network infrastructure, and IT systems; plans and supports infrastructure solutions; troubleshoots system and network issues; performs backups and disaster recovery; manages firewalls, antivirus, user accounts, permissions, and access controls; documents policies and procedures; and collaborates with IT teams and stakeholders.

Administer and support enterprise computer systems, servers, workstations, applications, operating systems, and infrastructure. Resolve complex incidents, maintain system availability and security, implement backup and disaster recovery solutions, and improve automation and monitoring. Lead or contribute to migrations, upgrades, implementations, and technical projects. Create documentation, collaborate with internal teams and vendors, provide technical guidance, and participate in on-call and after-hours maintenance activities.

Designs, administers, secures, and automates enterprise Linux infrastructure across physical, virtual, and cloud environments. Responsibilities include configuration management, patching, monitoring, storage and networking, identity integration, backup and disaster recovery, vulnerability remediation, compliance support, incident escalation, and infrastructure project leadership. The role mentors technical staff, develops standards and documentation, participates in on-call support, and contributes to infrastructure architecture and roadmap decisions.

Designs, administers, secures, and operates Windows Server and Azure infrastructure, including identity, networking, monitoring, patching, backup, disaster recovery, and automation. Leads complex incident resolution, infrastructure migrations, site buildouts, compliance efforts, and security hardening. Mentors administrators, establishes technical standards, supports Microsoft 365 and endpoint management, maintains documentation, and participates in on-call support and occasional maintenance travel.

Leads enterprise Linux architecture, administration, and lifecycle activities for classified government systems. Designs high-availability, backup, disaster recovery, virtualization, containerization, networking, identity, and automation solutions. Directs major system enhancement projects, establishes technical standards, supports multiple networks, and resolves complex technical challenges independently. Provides mentorship and technical leadership while maintaining documentation, security, monitoring, and compliance practices. This is a full-time, on-site role requiring after-hours or weekend work as needed.

Administers Xflow, Concur, Tipalti, and SAP-connected P2P systems. Responsibilities include user provisioning, access controls, system monitoring, troubleshooting, integrations, compliance audits, configuration, UAT, documentation, master-data standardization, and process improvement. Partners with Accounts Payable, Procurement, IT, and vendors to resolve issues and implement reliable, secure technology solutions.

Administer and support Linux systems across classified networks at an on-site government-contracting facility. Responsibilities include installation, patching, troubleshooting, configuration management, backup and recovery, file-system administration, security logging, audit support, testing, documentation, ticket resolution, and cross-disciplinary issue isolation. The role requires adherence to information-system security procedures, collaboration with engineering and support teams, occasional after-hours work, and handling equipment up to 50 pounds.

Administer classified Linux systems across multiple networks, including installation, patching, monitoring, configuration management, backups, recovery, security auditing, and troubleshooting. Collaborate with engineering, networking, cybersecurity, and end-user teams; maintain documentation, test releases, manage system images, and support ticketing processes. The role requires onsite work, an active Secret clearance, compliance with government security standards, occasional travel, and after-hours support as needed.

Leads Linux systems administration for classified government environments, overseeing multi-user systems, networks, upgrades, monitoring, configuration management, backups, security access, and disaster recovery. The role develops technical standards, supports testing and change management, maintains security documentation and A&A submissions, advises senior leadership, coordinates with vendors and IT teams, and mentors staff. Work is fully on-site in Azusa, California, requires a current Top Secret clearance, and includes occasional travel plus after-hours or weekend support.

Lead and sustain large-scale HPC systems supporting NOAA/NWS forecasting. Manage scheduler/software stack (PBS Pro/Slurm), optimize performance and throughput, troubleshoot multi-node Linux clusters, develop scripts, and support 24/7 operations with occasional travel and on-call duties.

Administer and support the SAP Concur platform, including configuration, user access, expense policies, workflows, audit rules, integrations, reporting, and data quality. Troubleshoot employee and finance issues, coordinate with internal teams and SAP Concur support, maintain documentation and controls, support audits, and deliver training. The role also improves travel and expense processes and supports integrations with HR, identity management, corporate card, accounting, and ERP systems.

Administer identity, Google Workspace, email security, endpoint management, networking, SaaS applications, and cloud IAM for a distributed organization. Serve as the US escalation point for IT Support, manage onboarding and offboarding, conduct access audits, support acquisitions and platform consolidations, automate recurring tasks with scripts and APIs, coordinate security-provider activities, and maintain infrastructure documentation and runbooks. The role owns the New York office network and infrastructure projects end to end.

Lead end-to-end production title setup and master data maintenance across production finance systems. Configure and validate SAP-related financial structures (WBS, company codes, coding strings), location accounting setups, and internal database records. Coordinate cross-functional stakeholders, drive onboarding and deactivation workflows, perform monthly data validations, support system projects, testing, and data cleanups, and serve as subject-matter expert for production finance master data and system-driven processes.

Provide hands-on IT administration for approximately 230 employees across macOS and Windows. Responsibilities include Tier 1 and Tier 2 support, SaaS and identity administration, endpoint management, onboarding and offboarding, asset inventory, compliance reporting, workflow monitoring, scripting, documentation, lab and VDI support, and vendor coordination.

Designs, deploys, and maintains Linux workstations and servers. Develops Puppet configuration management, creates Ubuntu imaging processes, resolves Tier 2 and Tier 3 technical issues, supports hardware and software developers, and assists with infrastructure automation using Terraform. The role also contributes to identity and access management, patching, system security, documentation, and scalable workstation and infrastructure operations.

Administers, maintains, monitors, and secures enterprise network infrastructure across multiple platforms. Configures Cisco networking technologies, firewalls, VPNs, wireless systems, and monitoring tools; troubleshoots complex network issues; implements security controls; and supports availability, performance, and compliance. Collaborates with network engineering, IT operations, and security teams while documenting environments, developing procedures, and potentially training junior staff and end users.

Owns identity, access, device, SaaS, automation, and IT systems for a remote organization. Responsibilities include Okta administration, macOS and Windows MDM, employee lifecycle workflows, ticketing, Zoom and Zoom Phone, AI governance, SaaS discovery, 1Password, security controls, documentation, dashboards, and SOC 2 evidence. The role combines hands-on IT support with systems architecture, integrations, automation, and security-minded operational ownership.

Administer and optimize NetSuite and related financial systems, supporting configurations, integrations, permissions, troubleshooting, reporting, controls, and performance. Partner with Accounting, Tax, Order-to-Cash, and development teams on implementations and process improvements. Manage complex financial workflows including subscription billing, revenue recognition, and multi-system integrations while documenting requirements and delivering scalable solutions.

Supports and administers Oracle EPM Cloud, Hyperion, and other FP&A applications, databases, reports, and integrations. Maintains system performance, data integrity, security, and availability; troubleshoots issues and supports users. Develops requirements, data mappings, documentation, test cases, and upgrade implementations. Partners with finance, technology teams, vendors, and stakeholders on projects involving planning, forecasting, reporting, cost allocation, automation, and innovative enterprise application technologies.