Senior Systems Administrator

AI summary

Nestoil Limited, Nigeria's largest indigenous EPCC company in the Oil and Gas sector, is hiring a Senior Systems Administrator in Lagos. The role involves managing data center infrastructure, Microsoft environments, Veeam backups, Active Directory, VDI, M365, and enterprise security solutions. The position reports to the Head, ICT Systems and offers an opportunity to work within a major energy-sector organization.

• Senior-level ICT infrastructure role at a leading Nigerian oil and gas EPCC company
• Based in Lagos, reporting to Head, ICT Systems
• Covers Microsoft, Veeam, Active Directory, VDI, M365, and enterprise security
• Involves coaching other administrators and handling escalated technical issues
• Focus on data center, network, server, storage, and client-computing infrastructure

Original source description

Senior Systems Administrator at Nestoil Limited ⏲ Aug 28, 2026, 11:04 AM ⋕ View all Oil & Gas jobs Nestoil is Nigeria’s largest indigenous Engineering, Procurement, Construction and Commissioning (EPCC) Company in the Oil and Gas sector and has been a significant contributor to local content in the industry since inception about 30 years ago. With about 2,000 direct employees, Nestoil continues to redefine industry standards in Pipeline Construction, Repairs and Maintenance with associated facilities for Dredging, River Crossing and Shoreline Protection. We are recruiting to fill the position below: Job Title: Senior Systems Administrator Location: Lagos Reports To: Head, ICT Systems Reports To: Head, ICT Systems Direct Reports: Administrators Internal Relationships: All Users External Relationships: Vendors Department: Information and Communication Technology Job Summary & Purpose This role is a key position within ICT operations and will be called upon to resolve higher levels of technical issues on Microsoft and other data center technologies, including end-user computer environment protection. The Senior Systems Administrator will be responsible for resolving escalated service issues, coaching other administrators to resolve, engineering and implementing complex projects, and maintaining and overseeing data center infrastructure. Responsibilities: Manage and support Veeam cloud/on-prem backup infrastructure. Support hybrid Microsoft environments. Investigate and analyze resource utilization and prepare reports. Plan the replacement of obsolete resources that make up the enterprise network infrastructure. Device compliance and configuration. Device management and enrollment. Build, support and maintain Active Directory Group Policy Objects used to secure and configure the enterprise client-computing infrastructure. Mobile Application Management. Investigate and analyze resource utilization and prepare reports and metrics, making appropriate changes to optimize infrastructure and provide the highest possible level of performance and security. Manage the asset lifecycle process through planning and forecasting, including recommendations for replacement of obsolete or end-of-life resources. DLP policies. Build, support and maintain support documents, standard operating procedures and policies related to network, security systems, server and storage infrastructure, and client-computing infrastructure. Build, support and maintain enterprise network, servers and storage infrastructure, both virtual and physical, using routine commands, administration techniques, tools and utilities. Conditional Access. Build, support and maintain role-based access control for enterprise computing solutions, including VDI, endpoint management suite and Print/Scan solutions. Work with application developers and third-party vendors to develop software or virtualized installation packages for network deployment via the Enterprise configuration management suite. Build, support and maintain the VDI environment, including standardized templates, application delivery methods, enterprise antivirus, persona management infrastructure, host servers and zero clients. Optimize network infrastructure to maintain the highest possible level of performance and security. Build, support and maintain protection of company data and systems through security solutions, backups, redundancy and disaster recovery solutions. Management of Microsoft M365 including all communication and collaboration services offered under it, including Teams, Exchange E-mail, SharePoint, etc. Build, support and maintain the configuration management suite, including multiple Windows Enterprise desktop images (WIMs), automated task sequences, automated backup infrastructure, central imaging environment, automated software deployment and patch management updates. Interact with external vendors to evaluate technology changes, including licensing and contracts, and their impact on the business. Build, support and maintain Microsoft and Linux infrastructure for the enterprise. Identify security risks within the Office 365 environment and services and suggest mitigations. Key Performance Metrics Performance Area: Highly available UCC platform Functional data loss prevention Secure and highly available server infrastructure Highly available and secure e-mail infrastructure Performance Indicators : 99.9% e-mail service uptime - Number of e-mail security breaches 99.9% uptime on Unified Communication and Collaboration (UCC) services - Number of unplanned changes 100% backup of production data - Adherence to data retention policy 99.9% Server infrastructure uptime - Number of unplanned changes Person Specifications Academic Qualification Bachelor’s Degree in Information Technology or related discipline. Professional Qualifications: Microsoft 365 Security Administrator Microsoft Azure Security Engineer Microsoft Azure Administrator ITIL Foundation Experience: Extensive knowledge of Windows PowerShell, standard utilities and common Windows security tools. Minimum of 4 years of experience: in Windows systems installation, operations, administration and maintenance of physical and virtualized servers. Experience: managing Windows Server OS and domain architecture, including Active Directory, DNS/DHCP, Microsoft Exchange, Certificate Services, GPOs, policies and permissions. Technical Knowledge & Expertise: Strong knowledge of network tools and protocols such as TCP/IP. Working knowledge of NAS/SAN storage environments. Excellent knowledge of Microsoft Active Directory Domain Services. Knowledge of authentication protocols and techniques including LDAPS, SAML and Kerberos. Excellent knowledge of VMware and administration of virtual servers. Ability to evaluate and remediate security vulnerabilities. Key Skills & Competencies: Knowledge of Microsoft M365/O365 administration. Experience: working with Microsoft Skype for Business. OSX troubleshooting experience. Deep knowledge of High-Availability computing and networking, including load balancing, TCP/IP, DHCP and DNS. Experience: using PowerShell and/or other scripting tools. Experience: with Exchange Server 2003–2016. Experience: with large Exchange to Office 365 migrations. Experience: with Windows Server 2003–2016. Deep knowledge of Microsoft Teams, SharePoint, Active Directory and Client/Server Architecture. In-depth technical expertise in messaging, video, voice, web conferencing and IP telephony technologies. Experience: working with File Security and Classifications. Solid grasp of UCC Communications Protocols including SIP, RTV, WebRTC, H.264 and H.323, and understanding of the impact of QoS in the UCC ecosystem. Knowledge of Hyper-V, vSphere, Citrix, SQL and Terminal Services. Experience: implementing Office 365 and Exchange Online. Office 365 administration, applications and services in a hybrid server environment. How to Apply Interested and qualified candidates should: Click here to apply online View all Jobs in Nigeria Lagos State