Senior Linux Administrator Infrastructure & Cloud Operations

Worktual Innovations; Chennai; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

Worktual Innovations Pvt. Ltd. in Chennai is seeking a Senior Linux Administrator to lead production infrastructure across on-prem and cloud.You will manage Ubuntu/Debian servers, high-availability clusters, email systems, virtualization, and cloud services (AWS/OCI/Azure), with security, performance, and disaster recovery focus. Strong scripting and automation skills are essential.

Join a seasoned IT Infrastructure & Operations team to drive reliable operations and strategic improvements.

Qualifications

• 10+ years Linux admin in production infra.
• Ubuntu/Debian server admin, troubleshooting, performance tuning, security hardening.
• Design and manage high-availability clusters with automatic failover.
• MySQL/PostgreSQL admin with replication and DR.
• Postfix/Dovecot admin with SPF/DKIM/DMARC.
• Proxmox VE, KVM, LXC virtualization.
• Cloud infra: AWS, OCI, Azure.
• Storage knowledge: RAID/LVM/NFS/iSCSI, backups & DR.
• Networking: TCP/IP, DNS, VLANs, VPN, firewalls.
• Automation: Bash, Python, Ansible.

Responsibilities

• Linux operations: manage Ubuntu/Debian production servers, patching, tuning, CIS hardening.
• High availability: design, implement, maintain HA using Pacemaker/Corosync/Keepalived and HAProxy.
• Email infrastructure: manage Postfix/Dovecot with email security features.
• Virtualization: administer Proxmox VE clusters, KVM, LXC, VM migration and backups.
• Cloud infrastructure: manage compute, networking, storage, security across AWS/OCI/Azure.
• Storage & DR: manage RAID/LVM/NFS/iSCSI, backups, off-site replication, DR testing.
• Infrastructure security: firewall policies, SSH hardening, vulnerability remediation.
• Monitoring & automation: Zabbix/Prometheus/Grafana; Bash/Python/Ansible scripting.
• Web & app infra: manage Nginx, Apache, Docker, SSL, reverse proxies, DNS.
• Networking: TCP/IP, DNS, VLANs, routing, VPNs; incident RCA and docs.
• Technical leadership: mentor juniors and coordinate with DevOps/security teams.

Skills

Linux operations

HA clustering

Email infrastructure

Virtualization

Cloud infrastructure

Storage & DR

Security operations

Monitoring & automation

Web & app infrastructure

Networking

Incident handling

Technical leadership

Education

B.E./B.Tech/MCA in CS/IT

Tools

Pacemaker

Corosync

Keepalived

HAProxy

Postfix

Dovecot

Proxmox VE

KVM

LXC

AWS

OCI

Azure

Nginx

Apache

Docker

Kubernetes

Zabbix

Prometheus

Grafana

Bash

Python

Ansible

rsync

Job description

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.
• Strong 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.