Senior Systems Administrator

• Strategic Design & Implementation: Lead AWS/Azure infrastructure design and deployment with internal teams and vendors, aligned with business and technical goals
• Active Directory (AD) Management: Optimise AD across locations—manage users, policies, permissions, and implement MFA and conditional access
• Cloud Optimisation: Use cloud-native tools and automation to improve performance and reduce costs without compromising security
• Server Administration: Maintain Windows/Linux servers—patching, updates, tuning, HA/DR readiness for critical systems
• Network Oversight: Configure and monitor Cisco Meraki networks; collaborate with cybersecurity on network hardening

• Security Leadership: Partner with Cybersecurity to enforce ISO 27001, NIST, CIS standards; conduct audits and vulnerability assessments in line with overall business goals
• Performance Monitoring: Use Prometheus/Grafana to identify bottlenecks; build dashboards for real-time metrics visibility
• Backup & Disaster Recovery: Manage backup and disaster recovery strategies for cloud/on-premise; test and validate procedures regularly
• Automation & Scripting: Build Python/PowerShell scripts to automate tasks; mentor juniors in automation best practices

• Problem Management: Lead root cause analysis, implement fixes, and share insights to prevent recurring issues
• Project Leadership: Own infrastructure and user-facing projects; collaborate across teams for successful delivery
• Vendor Management: Participate in service reviews, negotiate contracts, and lead procurement for cost-effective solutions

• Mentorship: Guide junior staff, promote learning, and support professional growth within the team
• Collaboration & Communication: Serve as a technical expert, resolve complex issues cross-functionally, and communicate clearly with stakeholders

• Ideally 8 years of experience in IT systems administration, with at least 3 years in a senior roe managing enterprise-level Windows and Linux environments at scale (500+ end points)

• Direct experience of managing Microsoft Active Directory and Microsoft Entra – including PowerShell scripting
• Cloud administration in an AWS environment (as well as Google Cloud or Azure)
• Building / Managing of Linux instances (preferably CentOS or RedHat)
• Strong analysis skills – Proven ability to identify root causes, implement fixes, and lead improvements to boost system reliability and security
• Vendor Management – Track record of working with vendors to meet SLAs, negotiate contracts, and align solutions with business needs.
• Hands-on use of tools like Endpoint Central to manage assets and automate tasks efficiently.
• Skilled in designing Disaster Recovery and High Availability strategies for cloud and on-premise systems.
• Skilled in automation using scripting languages (PowerShell, Bash, Python) and tools like Ansible and/or Terraform
• Excellent communication skills in both written and spoken English

• Experience of handling updates on Meraki/Cisco or other next-gen firewalls and Linux instances
• Industry certifications in:

• Microsoft MCSE, Microsoft 365,
• AWS (Amazon Web Services)
• ITIL v3 or v4
• Cisco Certified Network Associate (CCNA)
• Familiar with security standards such as ISO27001/NIST/CIS
• Database Administration – familiar with regular DBA tasks on Oracle, MySQL/MariaDB, etc
• Use of tools like Prometheus and Grafana to track metrics and optimize performance.
• Ability to guide junior staff and promote learning and best practices.

Lennor Group