The role is designed for an experienced IT professional with strong expertise in Microsoft technologies, enterprise infrastructure, systems administration, cybersecurity, virtualization and cloud services.
The successful candidate will report to the Head, ICT Systems and will be responsible for maintaining and improving the organization’s technology infrastructure while supporting secure, reliable and highly available IT services.
Senior Systems Administrator Job at Nestoil
The Senior Systems Administrator will play a key role in Nestoil’s ICT operations, handling complex technical issues, supporting other system administrators and helping to deliver major infrastructure projects.
The position involves managing both physical and virtualized infrastructure and providing technical support across Microsoft and other data-centre technologies.
The successful candidate will also contribute to protecting the company’s computing environment, improving system performance and ensuring that critical IT services remain available.
Key Responsibilities
The Senior Systems Administrator will be responsible for a wide range of infrastructure and systems administration duties, including:
- Managing Microsoft 365 communication and collaboration services, including Microsoft Teams, Exchange and SharePoint.
- Managing device enrolment, compliance and configuration.
- Implementing and administering Conditional Access and Mobile Application Management.
- Managing Data Loss Prevention (DLP) policies.
- Identifying security risks within Microsoft 365 and recommending appropriate mitigation measures.
- Supporting hybrid Microsoft environments.
- Monitoring resource utilization and preparing performance reports.
- Optimizing network infrastructure for performance, availability and security.
- Planning the replacement of obsolete or end-of-life infrastructure.
- Supporting and maintaining Virtual Desktop Infrastructure (VDI) environments.
- Managing standardized desktop templates, application delivery, antivirus and related infrastructure.
- Maintaining configuration management systems, Windows images, automated software deployment and patch management.
- Managing Veeam cloud and on-premises backup infrastructure.
- Maintaining Active Directory Group Policy Objects used to secure and configure enterprise computing systems.
- Implementing role-based access control across enterprise computing solutions.
- Developing and maintaining technical documentation, standard operating procedures and IT policies.
- Working with application developers and third-party vendors on software and virtualized application deployments.
- Supporting enterprise networks, servers and storage infrastructure.
- Managing Microsoft and Linux infrastructure.
- Protecting company systems and data through security solutions, backup systems, redundancy and disaster recovery measures.
- Supporting the asset lifecycle process, including technology planning and replacement recommendations.
- Working with vendors on technology changes, licensing and contracts.
- Analysing infrastructure performance and recommending improvements.
Educational Requirements
Applicants should have a Bachelor’s degree in Information Technology or a related discipline.
The vacancy also lists the following professional qualifications as relevant:
- Microsoft Azure Administrator
- Microsoft 365 Security Administrator
- Microsoft Azure Security Engineer
- ITIL Foundation
Required Experience
Candidates are expected to have a minimum of four years of experience in Windows systems installation, administration, operations and maintenance involving physical and virtualized servers.
Applicants should have experience with:
- Windows Server operating systems.
- Active Directory and domain architecture.
- DNS and DHCP.
- Microsoft Exchange.
- Certificate Services.
- Group Policy Objects.
- Policies and permissions.
- Windows PowerShell.
- Windows security tools and standard administration utilities.
Technical Skills
The role requires strong technical knowledge across enterprise IT infrastructure.
Candidates should demonstrate expertise in Microsoft Active Directory Domain Services, authentication technologies such as LDAPS, SAML and Kerberos, as well as network protocols including TCP/IP.
Knowledge of VMware and virtual server administration is also required, alongside working knowledge of NAS and SAN storage environments.
The successful applicant should be capable of identifying, evaluating and remediating security vulnerabilities affecting enterprise systems.
Additional Skills and Expertise
Nestoil is seeking a professional with extensive experience in Microsoft 365 and enterprise communications technologies.
Relevant experience includes:
- Office 365 administration.
- Microsoft Teams and SharePoint.
- Exchange Online.
- Hybrid Exchange environments.
- Office 365 and Exchange migrations.
- Active Directory.
- Client/server architecture.
- PowerShell and scripting.
- High-availability computing and networking.
- Load balancing.
- DHCP and DNS.
- Messaging and unified communications.
- IP telephony.
- File security and classification.
- Hyper-V.
- VMware vSphere.
- Citrix.
- SQL.
- Terminal Services.
- Skype for Business.
- Exchange Server.
- Windows Server.
- macOS troubleshooting.
Experience with unified communications technologies and protocols such as SIP, WebRTC, H.264 and H.323 will also be valuable.
Performance Expectations
The Senior Systems Administrator will be expected to help maintain highly available and secure IT infrastructure.
Key performance targets include maintaining approximately 99.9% server infrastructure uptime, 99.9% email service uptime and 99.9% availability for unified communication and collaboration services.
The role also places emphasis on reliable backups, data protection and compliance with data retention policies.
Job Details
| Job Detail | Information |
|---|---|
| Position | Senior Systems Administrator |
| Company | Nestoil Group |
| Department | Information and Communication Technology |
| Location | Lagos, Nigeria |
| Reports To | Head, ICT Systems |
| Job Type | Full-time/Corporate ICT role |
| Minimum Education | Bachelor’s degree |
| Minimum Experience | 4 years |
| Professional Areas | Systems Administration, IT Infrastructure, Microsoft Technologies, Cybersecurity |
Who Should Apply?
This opportunity is particularly suitable for experienced systems administrators, infrastructure engineers and IT professionals with a strong background in Microsoft enterprise environments.
Candidates who have worked with Microsoft 365, Windows Server, Active Directory, VMware, Exchange, cybersecurity, virtualization, backup infrastructure and enterprise networks may be well suited to the position.
Applicants should ensure that their CV clearly demonstrates their technical experience and relevant professional certifications.
How to Apply for the Nestoil Senior Systems Administrator Job
Interested and qualified candidates should apply through the Nestoil careers application portal and provide the requested personal, educational and professional information.
Applicants will be required to provide their CV or resume as part of the application process.
Candidates should carefully review the requirements before submitting their application and ensure that their qualifications and experience match the position.
Application Portal: Nestoil Careers
Note: Applicants should rely on the official Nestoil recruitment platform for the latest application status and any updates concerning the vacancy.
