Offre fiable

Senior System Administrator

DAG Industries Nigeria Limited

Lagos, Nigeria CDI

Publiée il y a 1 mois · Expire dans 3 semaines

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Description du poste

A dynamic team is expanding and looking for the right talent. Role Overview
  • The Senior Systems Administrator is responsible for the design, implementation, optimization, security, and high-level support of an organization\'s critical IT infrastructure (servers, networks, cloud environments, storage, and identity systems). They ensure high availability, performance, security compliance, and disaster recovery readiness while mentoring junior staff and leading complex projects.
Key Responsibilities: Core Systems & Infrastructure
  • Install, configure, maintain, and optimize Windows and Linux servers
  • Manage Active Directory, Group Policy, DNS, DHCP, and identity services
  • Maintain and monitor virtualized environments (VMware, Hyper-V, or similar)
  • Support and manage cloud infrastructure (Azure, AWS, or hybrid)
  • Ensure high availability, performance tuning, patching, and lifecycle management
  • Maintain documentation, runbooks, and infrastructure standards
Network
  • Architect and manage core network infrastructure — LAN/WAN, VLANs, subnets, routing, switching, and wireless networks  
  • Configure, troubleshoot, and optimize network devices (routers, switches, firewalls, load balancers, proxies, VPN concentrators)  
  • Implement and maintain secure network access — site-to-site VPNs, remote access VPNs, Zero Trust Network Access (ZTNA), MFA enforcement  
  • Administer firewalls and security gateways (Palo Alto, Fortinet, Cisco ASA/Firepower, Azure Firewall, AWS Network Firewall) rule management, NAT, threat prevention, IPS/IDS integration
Security & Hardening
  • Implement and maintain MDM, endpoint security, EDR, antivirus, and patch management
  • Apply system hardening best practices (CIS benchmarks, least-privilege, secure baselines)
  • Manage firewalls, VPNs, NAC, and network segmentation in collaboration with network teams
  • Monitor logs and alerts; support incident response and root-cause analysis
  • Implement MFA, conditional access, privileged access management (PAM)
  • Conduct vulnerability scanning, remediation, and security improvements
  • Support compliance initiatives (ISO 27001, SOC2, internal policies, etc.)
Operations & Reliability
  • Monitor system health, availability, and capacity
  • Troubleshoot complex incidents with infrastructure, networking, identity, and applications
  • Manage backup, disaster recovery, and business continuity
  • Reduce operational risk by improving automation, observability, and resilience
  • Participate in on-call rotations and escalation workflows
  • Experience with Intune, MDM...

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