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IT Systems Administrator

2 weeks ago

Rotherham, United Kingdom In-tend Full time

IT Systems Administrator In-tend | Rotherham, England, United Kingdom Job Description We are seeking an experienced IT Systems Administrator to manage, maintain, and secure our enterprise IT infrastructure. The role involves supporting a full-stack environment, spanning Windows and Linux systems, utilising SANs (multipath I/O), clustered and virtualised servers, high-availability firewalling, replicated storage systems, application servers, mail systems, backup solutions, and VoIP systems. The successful candidate will play a key role in ensuring N+ redundancy, clustering, and high availability across all critical systems, safeguarding service delivery of our bespoke SaaS platform for customers. Responsibilities Infrastructure Management Administer and maintain Windows and Linux servers across production and development environments. Manage SAN storage, ensuring correct multipath I/O configuration, performance tuning, and redundancy. Deploy, monitor, and maintain virtualisation environments for high availability. Ensure N+1 redundancy across compute, storage, and network layers to minimise single points of failure. Implement and maintain server clustering for critical services (databases, applications, file servers, etc.). Network & Security Configure and maintain VLANs, firewalls, VPNs, and routing for secure and segmented traffic flows. Deploy and maintain HA firewalls in active/passive configurations to guarantee continuous protection and uptime. Monitor and harden network services to prevent intrusion and ensure compliance with best practices. Conduct vulnerability assessments, patching, and incident response for infrastructure security. SaaS Application Server Management Administer and maintain the application servers powering our bespoke SaaS platform, ensuring high performance, scalability, and reliability. Implement monitoring, alerting, and proactive maintenance strategies to support 100% planned uptime for customer-facing services. Manage load balancing, clustering, and redundancy across application tiers to maintain continuous availability during updates, failovers, or infrastructure events. Collaborate with development teams to roll out new releases, patches, and configuration changes in a controlled and resilient manner. Optimise resource usage and capacity planning to support business growth and customer demands without impacting service quality. Conduct regular performance testing, tuning, and root cause analysis of application-level incidents. Maintain strong security practices across SaaS infrastructure, ensuring customer data integrity and regulatory compliance. Communication & Collaboration Systems Administer and maintain VoIP telephony systems with redundancy and failover support. Manage and support secure remote worker access with VPN and endpoint management solutions. Maintain and secure mail systems and instant messaging, including clustered configurations for uptime, spam/phishing protection, and compliance. Data Protection & Continuity Oversee enterprise backup and disaster recovery solutions. Configure replicated and redundant backup strategies across multiple storage sites. Regularly test failover scenarios, including SAN multipath I/O, clustered servers, and HA firewalls. Develop and enforce business continuity plans aligned with enterprise recovery time objectives (RTOs) and recovery point objectives (RPOs). Operational Support Provide advanced troubleshooting and escalation support for IT incidents and outages. Document infrastructure, HA topologies, and operational procedures. Work closely with development and SaaS delivery teams to align IT systems with customer-facing SLAs. Required Skills & Experience Systems Administration Strong experience with Linux (RHEL/Ubuntu) and Windows Server administration. Proven experience with clustered and high-availability server deployments. Hands‑on experience with SANs and multipath I/O. Virtualisation expertise with libvirtd/KVM, including HA and clustering. Networking & Security Strong knowledge of VLANs, routing, switching, and firewall management. Experience deploying HA firewalls (active/passive) in enterprise environments. Familiarity with load balancers, redundancy strategies, and fault‑tolerant networking. Knowledge of IDS/IPS systems, SIEM, and enterprise security frameworks. Services & Applications Experience with clustered databases (e.g., MySQL, PostgreSQL and MS SQL clusters). Management of VoIP systems (Asterisk/FreePBX or equivalent) with redundancy. Experience running and securing mail systems. Familiarity with DNS, DHCP, LDAP/Active Directory, and identity federation. Backup & Disaster Recovery Strong background in enterprise backup technologies. Experience with redundant and offsite backups. Disaster recovery testing and HA failover experience. General Skills Proficiency in automation and scripting (Bash, PowerShell, Python, Ansible). Excellent problem‑solving in complex, multi‑layered enterprise environments. Strong communication and documentation skills. Ability to design, implement, and maintain redundant, fault‑tolerant systems. Preferred Qualifications Certifications: RHCE/RHCSA, MCSE, or equivalent. Experience in SaaS or high‑availability hosting environments. Familiarity with compliance frameworks (ISO 27001, SOC 2, GDPR). Experience with enterprise monitoring/observability platforms. What We Offer Hands‑on exposure to enterprise‑scale high‑availability infrastructure. Professional development and certification opportunities. A collaborative culture focused on innovation, security, and resilience. Seniority level Mid‑Senior level Employment type Full‑time Job function Information Technology Industries IT Services and IT Consulting #J-18808-Ljbffr