Linux & Infrastructure Administrator

The Senior Linux & Infrastructure Administrator will play a critical role in managing and supporting Tasdeeq’s enterprise server and infrastructure environment. This position focuses primarily on RHEL Linux systems, Nginx load balancers, VMware virtualization, enterprise storage, backup, and disaster recovery. The successful candidate will be responsible for ensuring the stability, security, and performance of production and DR environments through effective administration, monitoring, troubleshooting, and operational support.

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 package management using RPM/YUM/DNF. Diagnose CPU, memory, disk, filesystem, boot, and application issues. Maintain LVM, partitions, filesystems, and mount points, including filesystem expansion and storage troubleshooting. Configure and troubleshoot SELinux and firewalld, and perform Linux security hardening and vulnerability remediation.

- Nginx Load Balancer Administration: Administer Nginx load balancers running on RHEL VMs. 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 and backend failover mechanisms. Troubleshoot common Nginx errors such as 502, 503, and 504, analyze access and error logs, and perform controlled configuration reloads. Resolve connectivity issues between Nginx, backend servers, network, and firewall.

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

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

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

- Automation and 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, IT, or a related field.
- 3 to 5 years of hands-on Linux system administration experience.
- Strong practical experience with RHEL production environments.
- Proven experience managing Nginx load balancers and enterprise infrastructure.
- Solid understanding of VMware virtualization and enterprise storage systems.
- Proficiency in RHEL/Linux administration, Nginx, SSL/TLS, LVM, Bash/Shell scripting, SSH/SFTP, SELinux, firewalld, VMware ESXi/vSphere, SAN/storage, and troubleshooting.

Preferred Qualifications and Certifications

- Red Hat Certified System Administrator (RHCSA) – Preferred.
- Red Hat Certified Engineer (RHCE) – Highly preferred.
- VMware certification – Advantageous.
- Relevant Linux or Cloud certifications – Considered a plus.

This role offers the opportunity to work within a dynamic enterprise environment, supporting critical infrastructure components and contributing to the reliability and security of Tasdeeq’s IT operations.