Linux / Windows Systems Administrator (GemStone/S DevOps)

We are looking for a skilled and proactive Linux/Windows Systems Administrator to take primary ownership of the GemStone/S application environment. You will install, configure, administer, monitor, and optimise the Linux servers that host these mission-critical systems across development, test, pre-live, and production.

This is a hands-on DevOps-focused role at the intersection of infrastructure and application platforms. You will ensure stability, security, performance, and availability while partnering closely with development, infrastructure, and operations teams. Ideal candidates thrive on ownership, enjoy troubleshooting complex systems, and are motivated to continuously improve reliability through automation and observability.

Key Responsibilities

Linux Server Administration

• Configure and maintain Linux operating systems (RHEL, Ubuntu, or similar) across all environments
  
• Coordinate OS upgrades, patching, and security updates with infrastructure and stakeholder teams
  
• Manage user accounts, permissions, groups, and access controls
  
• Monitor and maintain storage, file systems, network services, and system services
  
• Troubleshoot server, operating system, and infrastructure issues
  

GemStone/S Administration

• Monitor and maintain GemStone/S environments and core processes (stone, netldi, gem, repository)
  
• Configure and upgrade GemStone/S environments in collaboration with senior developers
  
• Monitor user and bulk processes, backups, replication, and recovery procedures
  
• Oversee repository integrity checks and escalate or resolve repository-related issues
  

Deployment Pipeline & DevOps

• Monitor deployment pipelines and respond to issues
  
• Support application deployments and environment configuration changes using Jenkins, Git, Ansible, and OS scripts
  
• Assist development teams with performance analysis and troubleshooting
  
• Maintain and enhance automation scripts (Jenkins, Ansible, Terragrunt, Bash/Batch)
  
• Support CI/CD processes and implement configuration management / infrastructure-as-code practices where applicable
  

Monitoring, Performance & Observability

• Monitor server health, application availability, disk usage, memory, and overall system performance
  
• Implement and improve proactive monitoring and alerting
  
• Enhance observability through integration with organisational tools (DataDog)
  

Security & Compliance

• Enforce Linux security standards and best practices
  
• Manage SSH access, certificates, firewall configurations, and vulnerability remediation
  
• Ensure compliance with security policies and audit requirements
  
• Participate in security reviews and incident response activities
  

Backup, Recovery & Business Continuity

• Monitor daily restore procedures and maintain backup/recovery processes
  
• Develop, test, and document recovery procedures
  
• Perform regular disaster recovery validation exercises
  
• Ensure RTO and RPO objectives are met
  

Documentation, Support & Continuous Improvement

• Maintain accurate technical documentation, operational runbooks, and troubleshooting guides
  
• Document architecture changes and system dependencies
  
• Support production incident investigation, conduct root-cause analysis, and implement preventative measures
  
• Collaborate with internal teams to resolve complex issues
  
• Use approved AI-assisted tools to enhance coding, testing, troubleshooting, and documentation (while applying appropriate governance and validation)
  

Requirements

Qualifications & Experience

• Diploma or Degree in Information Technology, Computer Science, Engineering, or a related field
  
• 5+ years of Linux systems administration experience
  
• 2+ years supporting enterprise application platforms
  
• Proven experience administering mission-critical production environments
  
• Relevant Linux certifications are advantageous
  
• Experience supporting GemStone/S environments is highly advantageous
  

Technical Competencies

• Strong Linux administration (Red Hat Enterprise Linux, Ubuntu, or similar)
  
• Shell scripting (Bash, Python, or similar)
  
• Systems, networking (TCP/IP), storage management, and performance tuning
  
• MQ configuration experience
  
• Git version control
  
• Ansible or similar automation/configuration management tools
  
• Monitoring and observability tools (DataDog; Prometheus knowledge beneficial)
  
• CI/CD tooling knowledge (Jenkins advantageous)
  
• Cloud platform experience (AWS advantageous)
  
• GemStone/S skills, including backup/recovery, performance monitoring, capacity planning, and MFA/client token integration (advantageous)
  

Ready to apply? Please submit your CV highlighting relevant Linux, DevOps, and any GemStone/S experience.