Senior Systems Administrator

Cubic Transportation Systems

When you join Cubic, you become part of a company that creates and delivers technology solutions in transportation to make people’s lives easier by simplifying their daily journeys, and defense capabilities to help promote mission success and safety for those who serve their nation. Led by our talented teams around the world, Cubic is committed to solving global issues through innovation and service to our customers and partners. We have a top-tier portfolio of businesses, including Cubic Transportation Systems (CTS) and Cubic Defense (CD). Explore more on Cubic.com.

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.

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.

Employee

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.