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 sits in the ICT department and involves resolving escalated technical issues, managing enterprise network, server, and storage infrastructure, supporting hybrid Microsoft environments, and overseeing data center operations including VDI, M365, Active Directory, and backup systems.

• Senior-level ICT role at a leading Nigerian oil and gas EPCC company
• Based in Lagos, reporting to the Head of ICT Systems
• Covers enterprise infrastructure: servers, storage, VDI, M365, and Active Directory
• Involves coaching other administrators and leading complex projects
• Focus on security, compliance, DLP policies, and conditional access

Original source description

Senior Systems Administrator at Nestoil Limited ⏲ Aug 28, 2026, 6:04 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 Department: Information and Communication Technology Reports To: Head, ICT Systems 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: Build, support and maintain enterprise network, servers and storage infrastructure, both virtual and physical, using routine commands, administration techniques, tools and utilities. Optimize network infrastructure to maintain the highest possible level of performance and security. Mobile Application Management. Plan the replacement of obsolete resources that make up the enterprise network infrastructure. Device management and enrollment. Device compliance and configuration. DLP policies. Build, support and maintain the VDI environment, including standardized templates, application delivery methods, enterprise antivirus, persona management infrastructure, host servers and zero clients. Identify security risks within the Office 365 environment and services and suggest mitigations. 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 support documents, standard operating procedures and policies related to network, security systems, server and storage infrastructure, and client-computing infrastructure. Investigate and analyze resource utilization and prepare reports. Build, support and maintain role-based access control for enterprise computing solutions, including VDI, endpoint management suite and Print/Scan solutions. 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. Support hybrid Microsoft environments. Manage and support Veeam cloud/on-prem backup infrastructure. Build, support and maintain Active Directory Group Policy Objects used to secure and configure the enterprise client-computing infrastructure. Management of Microsoft M365 including all communication and collaboration services offered under it, including Teams, Exchange E-mail, SharePoint, etc. Manage the asset lifecycle process through planning and forecasting, including recommendations for replacement of obsolete or end-of-life resources. 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. Conditional Access. Build, support and maintain protection of company data and systems through security solutions, backups, redundancy and disaster recovery solutions. Key Performance Metrics Performance Area Performance Indicators Secure and highly available server infrastructure 99.9% Server infrastructure uptime Number of unplanned changes Highly available and secure e-mail infrastructure 99.9% e-mail service uptime Number of e-mail security breaches Highly available UCC platform 99.9% uptime on Unified Communication and Collaboration (UCC) services Number of unplanned changes Functional data loss prevention 100% backup of production data Adherence to data retention policy Person Specifications Academic Qualification: Bachelor’s Degree in Information Technology or related discipline. Professional Qualifications: Microsoft Azure Administrator Microsoft 365 Security Administrator Microsoft Azure Security Engineer ITIL Foundation Experience: Minimum of 4 years of experience: in Windows systems installation, operations, administration and maintenance of physical and virtualized servers. Extensive knowledge of Windows PowerShell, standard utilities and common Windows security tools. Experience: managing Windows Server OS and domain architecture, including Active Directory, DNS/DHCP, Microsoft Exchange, Certificate Services, GPOs, policies and permissions. Technical Knowledge & Expertise: Ability to evaluate and remediate security vulnerabilities. Excellent knowledge of VMware and administration of virtual servers. Strong knowledge of network tools and protocols such as TCP/IP. Knowledge of authentication protocols and techniques including LDAPS, SAML and Kerberos. Excellent knowledge of Microsoft Active Directory Domain Services. Working knowledge of NAS/SAN storage environments. Key Skills & Competencies: Knowledge of Hyper-V, vSphere, Citrix, SQL and Terminal Services. Deep knowledge of High-Availability computing and networking, including load balancing, TCP/IP, DHCP and DNS. Experience: with Exchange Server 2003–2016. OSX troubleshooting experience. Knowledge of Microsoft M365/O365 administration. Experience: using PowerShell and/or other scripting tools. Experience: working with Microsoft Skype for Business. Deep knowledge of Microsoft Teams, SharePoint, Active Directory and Client/Server Architecture. Experience: implementing Office 365 and Exchange Online. Experience: with Windows Server 2003–2016. In-depth technical expertise in messaging, video, voice, web conferencing and IP telephony technologies. 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. Experience: with large Exchange to Office 365 migrations. Office 365 administration, applications and services in a hybrid server environment. Experience: working with File Security and Classifications. Organisational Relationships: External Relationships: Vendors Reports To: Head, ICT Systems Internal Relationships: All Users Direct Reports: Administrators How to Apply Interested and qualified candidates should: Click here to apply online View all Jobs in Nigeria Lagos State