Senior Linux Admin

Job Description

Job Summary

Senior Linux Administrator

Oracle Cloud Infrastructure (OCI)

Microsoft Azure Cloud

Linux System Administration

• Install, configure, and maintain Linux servers (RHEL, Oracle Linux, CentOS, AlmaLinux).
• Perform system upgrades, patching, and security hardening using enterprise patching solutions (e.g., Red Hat Satellite) and standard change management practices.
• Monitor system performance, troubleshoot issues, and ensure high availability.
• Manage user access, permissions, and system security.

Cloud Infrastructure (OCI & Azure)

• Deploy, configure, and manage Linux workloads on OCI and Azure platforms.
• Design and maintain scalable, secure cloud infrastructure.
• Work with OCI services including Compute, VCN, Block Volumes, File Storage, Load Balancer, IAM, and monitoring/logging capabilities.
• Manage Azure services including Virtual Machines, Virtual Networks, Azure Storage (Managed Disks, Files), Azure Backup (Recovery Services Vault), monitoring, and Microsoft Entra ID (Azure AD).
• Implement backup, disaster recovery, and high availability solutions in cloud environments using OCI/Azure-native capabilities (e.g., Azure Backup via Recovery Services Vault, Azure Site Recovery (ASR), and OCI backup features) and/or enterprise backup tools as applicable.
• Apply cloud governance and operational best practices (tagging, least privilege, patching/maintenance windows) including patch orchestration with Azure Update Manager for Azure VMs; optimize performance and cost for Linux workloads.

On-Premises Infrastructure & Storage

• Manage physical and virtualized environments (VMware) including provisioning, lifecycle management, and performance tuning.
• Administer enterprise storage platforms and services including SAN/NAS, RAID concepts, LUN provisioning, zoning/masking (as applicable), and NFS/SMB integrations; experience with storage arrays such as NetApp (ONTAP), HPE (3PAR), and IBM storage is highly desirable; familiarity with SAN fabrics (Brocade and/or Cisco MDS) is a plus.
• Configure and troubleshoot Linux storage stack components such as multipathing, LVM, udev rules, and filesystems (ext4, XFS); perform capacity management and growth activities.
• Ensure seamless integration between on-prem and cloud (hybrid connectivity, routing/DNS, identity, and operational processes) and perform ongoing infrastructure optimization.
• Implement and validate backup/restore and disaster recovery procedures; hands-on experience with enterprise backup platforms such as Commvault, Veritas NetBackup, and Cohesity; leverage storage snapshots and replication (vendor-native replication, NetApp, replication where applicable) and participate in DR drills and recovery testing.

Automation & DevOps

• Develop automation scripts using Bash, Python, or Shell scripting.
• Use configuration management tools like Ansible.
• Manage Infrastructure as Code (IaC) tools (Terraform preferred).

Monitoring & Performance

• Implement and manage monitoring tools.
• Analyze system logs and proactively resolve issues.
• Ensure SLA compliance and system uptime.

Security & Compliance

• Implement security best practices and vulnerability management.
• Ensure compliance with organizational and regulatory standards.
• Manage firewall rules, SELinux policies, and access controls.

Collaboration & Support

• Work closely with DevOps, application, and database teams.
• Provide L2/L3 support and participate in incident management.
• Prepare technical documentation and SOPs.

Required Skills & Qualifications

• Bachelor’s degree in Computer Science, Information Technology, or equivalent practical experience.
• 8+ years of hands-on Linux system administration experience in enterprise environments (production operations and on-call support).
• Strong expertise in:
• + Enterprise Linux (RHEL/Oracle Linux; systemd, networking, troubleshooting, performance tuning)
• + Oracle Cloud Infrastructure (OCI) including networking (VCN), compute, IAM, and storage (Block Volumes/File Storage)
• + Microsoft Azure including compute, networking, storage, monitoring, and identity (Microsoft Entra ID)
• + Storage administration: SAN/NAS fundamentals, multipathing, LVM, filesystems (XFS/ext4), and capacity planning; exposure to enterprise storage vendors such as NetApp ONTAP, HPE 3PAR, and IBM and SAN switches (Brocade/Cisco MDS).
• Must-have: Working knowledge of Oracle Database administration on Linux (installation/patching support, Oracle user and filesystem layout, listener basics, performance/log locations); familiarity with RMAN backup concepts and Data Guard fundamentals is preferred.
• Experience with virtualization platforms (VMware and/or Hyper-V); understanding of virtual networking and storage integrations.
• Strong scripting skills (Bash) for automation, reporting, and operational tooling.
• Hands-on experience with automation and IaC tools (Ansible required; Terraform preferred).
• Experience with patch management and lifecycle tooling such as Red Hat Satellite (content views, activation keys, repositories) and Azure Update Manager for scheduling and compliance reporting.
• Strong networking fundamentals (TCP/IP, routing, DNS, DHCP, NTP) and ability to collaborate on firewall/security configurations.
• Experience with backup/restore and disaster recovery practices (RPO/RTO concepts, recovery testing, documentation) using tools such as Azure Backup (Recovery Services Vault), Azure Site Recovery (ASR), and/or enterprise platforms including Commvault, Veeam, Veritas NetBackup, and Cohesity.

Working Conditions

• Participate in on-call rotation and provide support during planned maintenance windows and critical incidents.
• Work in a hybrid environment supporting both data center and cloud operations; occasional after-hours work may be required for changes and upgrades.

• Oracle Cloud Infrastructure Certification

• Microsoft Azure Administrator (AZ-104) or equivalent
• Kubernetes / Container certifications (optional but preferred)

Key Competencies

• Strong troubleshooting and analytical skills
• Ability to work in hybrid (cloud + on-prem) environments
• Excellent communication and documentation skills
• Ability to work under pressure and handle critical incidents
• Nice to Have
• Experience with Kubernetes / OpenShift
• Knowledge of additional database environments is a plus.
• Exposure to monitoring tools