Senior Linux Administrator Infrastructure & Cloud Operations

Experience: 10+ Years

Department: IT Infrastructure & Operations

Company: Worktual Innovations Pvt. Ltd.

Location: Chennai

Roles & Responsibilities

- Linux operations: Manage Ubuntu/Debian production servers, including installation, patching, upgrades, performance tuning, troubleshooting, capacity planning and CIS security hardening.
- High availability & clustering: Design, implement and maintain HA infrastructure using Pacemaker, Corosync, Keepalived, HAProxy and load balancing, including automatic failover and recovery.
- Email infrastructure: Manage enterprise email systems using Postfix, Dovecot, PostfixAdmin, Amavis and OpenDKIM, including SMTP/IMAP, SPF, DKIM, DMARC, TLS and email security.
- Virtualization: Administrator Proxmox VE clusters, KVM, LXC containers, VM provisioning, live migration, shared storage, high availability and Proxmox Backup Server.
- Cloud infrastructure: Manage compute, networking, storage, security, backup and disaster recovery across AWS, Oracle Cloud Infrastructure (OCI) and Microsoft Azure.
- Storage & disaster recovery: Manage RAID, LVM, NFS, iSCSI, SAN/NAS, storage expansion and capacity planning. Implement automated backups using Rsync, Restic, Borg and pgBackRest, including off-site replication and DR testing.
- Infrastructure security: Implement firewall policies, SSH security, access controls, vulnerability remediation, malware investigation, server hardening and security incident response.
- Monitoring & automation: Implement Zabbix Monitoring, Prometheus and Grafana monitoring, infrastructure alerting and automation using Bash, Python and Ansible.
- Web & application infrastructure: Manage Nginx, Apache, Docker, SSL certificates, reverse proxies, DNS and application infrastructure troubleshooting.
- Networking: Manage TCP/IP, DNS, VLANs, routing, VPN, firewall configurations and network troubleshooting.
- Infrastructure operations:



Handle critical P1/P2 incidents, root cause analysis (RCA), infrastructure documentation and business continuity.
- Technical leadership: Lead infrastructure improvements, establish operational standards, mentor junior administrators and coordinate with DevOps, development and security teams.

Must-Have

- 10+ years of hands-on experience in Linux system administration and enterprise production infrastructure.
- Strong experience in Ubuntu/Debian server administration, troubleshooting, performance optimization and security hardening.
- Proven experience designing and managing high-availability clusters and automatic failover in production.
- Hands-on expertise in MySQL and PostgreSQL administration, replication, database clustering and disaster recovery.
- Robust experience administering enterprise Postfix/Dovecot email infrastructure, including SPF, DKIM and DMARC.
- Practical experience managing Proxmox VE, KVM, LXC, VM migration and virtualization clusters.
- Experience managing cloud infrastructure on AWS, OCI and/or Microsoft Azure.
- Strong knowledge of storage, RAID, LVM, NFS, backup solutions and disaster recovery.
- Solid networking knowledge: TCP/IP, DNS, VLANs, routing, VPN and firewalls.
- Hands-on experience with infrastructure monitoring, security operations and vulnerability remediation.
- Ability to develop automation using Bash and Python/Ansible.
- B.E./B.Tech/MCA in Computer Science, IT or equivalent qualification.

Good to Have

- RHCE/RHCSA, AWS SysOps, OCI or Microsoft Azure Administrator (AZ-104) certifications.
- Experience with Wazuh, SIEM, centralized logging and security monitoring.
- Experience managing VoIP infrastructure, Asterisk PBX, SIP and real-time communication platforms.
- Experience managing NVIDIA GPU servers and AI/LLM infrastructure.
- Experience with Kubernetes, Docker, Jenkins and CI/CD infrastructure.
- Experience mentoring junior Linux administrators and leading infrastructure operations teams.

📌 Senior Linux Administrator Infrastructure & Cloud Operations (Chennai)
🏢 Worktual Innovations
📍 Chennai