Unix Admin Engineer/Senior Unix Admin Engineer

About the Role: At Xtremax, we build and support mission-critical digital infrastructure that powers large-scale public and enterprise services across Singapore. We are looking for an experienced Unix Admin Engineer to administer, secure, and support enterprise Unix/Linux server and backup environments across on-premises and cloud platforms. In this role, you will be responsible for ensuring critical systems and data remain highly available, secure, recoverable, and operationally resilient through system administration, backup management, automation, monitoring, and robust disaster recovery practices. Key Responsibilities: • Install, configure, administer, and troubleshoot Unix/Linux servers, with a focus on RedHat Enterprise Linux (RHEL) environments across development, testing, and production. • Provision, maintain, and decommission servers across enterprise environments. • Perform operating system hardening, security patching, vulnerability remediation, and configuration compliance checks. • Monitor system availability, capacity, logs, and performance, resolving infrastructure incidents promptly. • Administer user accounts, privileged access, file systems, storage allocations, permissions, system services, and scheduled jobs. • Manage enterprise backup infrastructure, including backup policies, schedules, retention requirements, and storage capacity management. • Monitor daily backup jobs, investigate failures, and resolve exceptions promptly. • Conduct regular restoration tests to validate system and data recoverability across systems, applications, databases, and file-level backups. • Maintain backup documentation, recovery procedures, media inventories, and operational records. • Support disaster recovery (DR) planning, tabletop exercises, and recovery drills to validate restoration capability against recovery objectives. • Collaborate with application, database, network, cloud, and cybersecurity teams to resolve technical issues and support infrastructure changes. • Maintain accurate server, backup, and configuration records in the CMDB. • Develop and maintain shell scripts, Ansible playbooks, and automated workflows for server provisioning, patching, monitoring, recovery validation, and compliance reporting. • Integrate operational activities with ITSM, monitoring, and observability platforms to improve visibility and traceability. • Maintain standard operating procedures (SOPs), technical documentation, runbooks, and knowledge articles. • Provide technical guidance to vendors and application teams while ensuring compliance with infrastructure standards, security controls, and change management requirements. • Participate in incident response, planned maintenance, and operational support outside normal working hours when required. Requirements: • Diploma or Degree in Computer Science, Information Technology, Engineering, or a related discipline. • Proven relevant experience administering enterprise Unix/Linux and backup environments. • Strong hands-on knowledge of Red Hat Enterprise Linux (RHEL), including system services, storage, file systems, networking, permissions, package management, logging, security, and troubleshooting. • Experience with enterprise backup technologies covering backup configuration, monitoring, troubleshooting, restoration, and disaster recovery testing. • Good understanding of backup retention, encryption, access control, off-site protection, and recovery requirements. • Practical experience in server provisioning, OS patching, performance monitoring, vulnerability remediation, and disaster recovery. • Working knowledge of shell scripting and automation tools such as Ansible. • Familiarity with virtualisation, cloud infrastructure, storage technologies, Infrastructureas Code, ITSM, CMDB, and observability tools. • Strong analytical, documentation, communication, and stakeholder management skills. • Ability to support planned maintenance and operational incident response outside normal working hours when required. Preferred Qualifications: • Red Hat Certified System Administrator (RHCSA) or Red Hat Certified Engineer (RHCE). • Recognized certification in enterprise backup technologies. • Certification in Ansible, cloud platforms, virtualisation, or IT service management. Data Protection Notice: By submitting your application, you consent to Xtremax Pte. Ltd. collecting, using, and disclosing your personal data for recruitment and employment-related purposes in accordance with the Personal Data Protection Act (PDPA).