Linux & Infrastructure Administrator

The Senior Linux & Infrastructure Administrator will oversee the administration, monitoring, troubleshooting, and operational support of the enterprise server and infrastructure environment. The role primarily focuses on managing RHEL Linux servers, Nginx Load Balancers, VMware virtualization, enterprise storage solutions, backup, and disaster recovery processes. This position ensures the stability, security, and performance of production and DR environments, working closely with cross-functional teams to maintain seamless infrastructure operations.

Key Responsibilities

- RHEL / Linux Administration: Manage and troubleshoot production RHEL Linux servers, including OS installation, configuration, patching, and upgrades. Handle user and permission management, SSH/SFTP access, and system resource issues such as CPU, memory, disk, and filesystem problems. Administer packages using RPM/YUM/DNF, analyze system logs, manage LVM, partitions, and filesystems, and perform storage troubleshooting. Configure and maintain SELinux and firewalld, focusing on Linux security hardening and vulnerability remediation.

- Nginx Load Balancer Management: Administer Nginx Load Balancers running on RHEL virtual machines. Configure upstream servers, backend pools, virtual hosts, and HTTP/HTTPS load balancing. Manage SSL/TLS certificates, including CSR generation, installation, renewal, and troubleshooting certificate-chain and TLS handshake issues. Set up health checks, backend failover, and resolve common Nginx errors such as 502, 503, and 504. Analyze access and error logs, perform configuration changes with controlled reloads, and troubleshoot connectivity between Nginx, backend servers, networks, and firewalls.

- VMware ESXi / vSphere: Administer and troubleshoot Linux virtual machines hosted on VMware ESXi/vSphere. Create and configure VMs, manage CPU, memory, disk, and network resources, and resolve VM performance and connectivity issues. Understand VMware datastores and virtual disk provisioning, coordinating with the virtualization team on ESXi-related matters.

- Dell SAN / Enterprise Storage: Support Dell enterprise SAN and storage infrastructure. Manage LUNs, datastores, RAID configurations, multipathing, and storage provisioning. Troubleshoot storage connectivity for Linux and VMware environments, coordinate storage allocation and expansion, and monitor storage capacity and performance.

- Backup & Disaster Recovery: Support Linux server backup and restoration processes. Troubleshoot backup failures and actively participate in disaster recovery planning, testing, and recovery activities. Maintain comprehensive server and service recovery documentation.

- Automation & Monitoring: Utilize strong Bash/Shell scripting skills to automate routine Linux administration and monitoring tasks. Basic knowledge of Ansible is preferred. Monitor server, service, and infrastructure health, and participate in incident response and root cause analysis.

Required Qualifications

- Bachelor’s degree in Computer Science, Information Technology, or a related field.
- 3 to 5 years of hands-on experience in Linux system administration, particularly with RHEL production environments.
- Proven expertise in managing Nginx load balancers and enterprise infrastructure.
- Strong skills in RHEL/Linux administration, including package management, SELinux, firewalld, and security hardening.
- Experience with VMware ESXi/vSphere virtualization platforms.
- Knowledge of enterprise storage systems, especially Dell SAN.
- Proficiency in troubleshooting complex infrastructure issues.
- Strong Bash/Shell scripting capabilities for automation.
- Familiarity with backup and disaster recovery processes.

Preferred Qualifications and Benefits

- RHCSA certification is preferred.
- RHCE certification is highly preferred.
- VMware certifications are considered an advantage.
- Relevant Linux or cloud certifications will be beneficial.

This role offers the opportunity to work in a dynamic enterprise environment, supporting critical infrastructure components and contributing to the organization’s operational resilience and security.