Senior Systems Administrator

Job Summary:

Seeking an experienced Senior System Administrator to design, manage, and scale mission-critical infrastructure across AWS and Azure. This role involves administering Linux platforms, container orchestration (EKS/AKS), Infrastructure as Code (Terraform), and automation (Ansible). The ideal candidate will ensure secure, reliable, and high-performing systems through proactive monitoring, automation, and continuous improvement.

Essential Job Duties and Responsibilities:

• Cloud Infrastructure (AWS & Azure)
  • Manage and optimize AWS services (EC2, VPC, IAM, RDS, S3, ALB/NLB, CloudWatch, EKS).
  • Support Azure environments (VMs, VNets, NSG, Azure Monitor, AKS, Azure Load Balancer, ).
  • Implement HA/DR strategies, cost optimization, tagging standards, and resource governance.
• Linux Administration
  • Install, secure, patch, and troubleshoot RHEL/Oracle Linux  systems.
  • Manage system performance, storage (LVM), filesystems, and SELinux policies.
  • Automate tasks using Bash/shell scripting and Ansible.
• Load Balancing
  • Design and maintain L4/L7 load balancing solutions (ALB/NLB, Azure Load Balancer, Nginx, HAProxy, or F5).
  • Configure SSL/TLS offloading, health checks, routing, and traffic policies.
• Containers & Orchestration (EKS/AKS)
  • Operate and maintain Kubernetes clusters, including RBAC, networking, storage, and security controls.
  • Perform cluster upgrades, manage deployments, scaling, and observability (Prometheus, Grafana, ELK).
• Infrastructure as Code (Terraform)
  • Build and manage Terraform-based deployments with modules, version control, and environment segregation.
  • Implement policy-as-code and maintain secure state management.
• Automation (Ansible)
  • Develop and maintain playbooks/roles for provisioning, patching, and configuration management.
  • Integrate Ansible workflows with CI/CD pipelines and secrets management.
• Security, Compliance & SRE Operations
  • Enforce CIS/NIST/ISO hardening standards, patch/vulnerability management, IAM policies, and incident response.
  • Define and track SLIs/SLOs, conduct RCAs and post-mortems, and maintain KB documentation.
• Collaboration & Mentorship
  • Work closely with development, network, and security teams to deliver resilient infrastructure.
  • Mentor junior administrators and contribute to knowledge transfer and documentation.
• Core Competencies
  • Ownership and accountability for production systems.
  • Clear documentation and knowledge sharing.
  • Strong analytical and communication skills.
  • Security-first mindset and attention to detail.
  • Ability to prioritize and perform under pressure with on-call responsibilities
  • 24*7 shift along with Oncall responsibility

General Duties and Responsibilities:

• Comply with Cubic’s Quality Management System
• Comply with Cubic Occupational Health, Safety and Environment policies and procedures
• Comply with security in accordance with established policies and procedures of the organisations
• Comply with Cubic Human Resources Procedures
• Other duties as requested

Minimum Job Requirements:

• 7 - 12 years of Linux system administration with strong AWS & Azure experience (core services, networking, IAM, EKS).

Working knowledge of Azure and AKS.

• Proficiency in Terraform and Ansible.
• Solid understanding of networking (TCP/IP, DNS, VPN, firewalls, SSL/TLS).
• Skilled in monitoring/observability (CloudWatch, Prometheus, Grafana, ELK/OpenSearch, Azure Monitor).
• Strong troubleshooting and performance tuning abilities; scripting in Bash/Python.

• Windows Server Administration (AD, DNS, Group Policy).
• VMware Administration (ESXi, vCenter, vSAN).
• Familiarity with Ivanti, GitOps (Argo CD/Flux), CI/CD (Azure DevOps, GitHub Actions).
• Experience with secrets management (HashiCorp Vault, AWS Secrets Manager).
• Professional certifications (AWS SysOps/Admin, CKA/CKAD, Azure Administrator, RHCSA/RHCE).

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We are committed to creating an inclusive workplace and welcome applications from people of all backgrounds. We do not discriminate based on any protected characteristic under applicable law.