L3 Senior Linux Engineer

About the role

An experienced L3 Linux System Engineer is sought for the infrastructure and technical operations team. The role covers resolving complex escalations, managing and optimizing Linux and cloud infrastructure, supporting web hosting environments, implementing automation, and keeping critical systems secure and reliable. It also involves guiding and mentoring L1 and L2 support teams and helping resolve high-priority incidents.

Key responsibilities

• Resolve complex escalations from L1 and L2 support and troubleshoot advanced Linux, server, network, cloud and application issues
• Perform root-cause analysis for failures, performance problems and security incidents
• Manage and optimize Linux servers, Windows servers, VMs, web servers, databases and cloud infrastructure; maintain high availability and reliability
• Manage AWS, Azure and GCP environments and configure web hosting platforms (Apache, Nginx, cPanel, Plesk, WHM)
• Implement automation and Infrastructure-as-Code with Ansible, Terraform, Puppet, Bash, Python or PowerShell
• Support CI/CD pipelines, monitor with Zabbix, Nagios, Prometheus and Grafana, and analyze logs with ELK Stack and Splunk
• Troubleshoot TCP/IP, DNS, BGP, VPNs, firewalls, load balancing and SSL/TLS; implement WAF, IDS/IPS, IAM, SIEM and DDoS protection
• Patch systems, harden security, remediate vulnerabilities, and design backup, HA and disaster recovery solutions
• Take part in capacity planning, create technical documentation and SOPs, and mentor L1 and L2 engineers
• Work US Central Time, including rotational on-call and emergency support

Required profile

• 7+ years in Linux system administration, cloud hosting, IT infrastructure or related fields
• Hands-on Linux experience, especially Ubuntu, RHEL and CentOS
• Windows Server and virtualization (VMware, KVM, Hyper-V); at least one major cloud platform (AWS, Azure or GCP)
• Web hosting knowledge, strong networking and infrastructure understanding
• Scripting and automation proficiency; monitoring, logging, security and incident-response tool experience
• Database knowledge (MySQL, PostgreSQL, MongoDB, Redis)
• Willingness to work US Central Time, take rotational shifts and on-call duty; immediate joiners or those available within 30-60 days preferred

Required skills

• Linux (Ubuntu, RHEL, CentOS), Bash, Python, Ansible, Terraform, PowerShell
• AWS, Azure, GCP, Kubernetes, CI/CD and DevOps (preferred)
• Certifications such as RHCE, AWS Solutions Architect, Azure Solutions Architect Expert, Google Cloud Professional, VMware VCP, CKA, Terraform Associate, CCNP/CCIE, CISSP or CEH (preferred)
• Experience with ISO 27001, PCI-DSS, GDPR or similar, and mentoring teams (preferred)