Mid-Senior Systems Engineer; Linux, K8s​/OpenShift & AWS

About Actionline

Actionline is a Greek company specializing in innovative Human Resources and Recruitment solutions since 2011. On behalf of our client, a leading company in the Energy sector, we are seeking an experienced Mid-Senior Systems Engineer to join a dynamic and highly skilled team.

Location: Athens
Industry: Energy
Employment Type: Full-time
Work Model: On-site

We are seeking a highly skilled Mid-Senior Systems Engineer
with strong cloud and container expertise. In this role, you will be a key contributor to managing, automating, and scaling our enterprise Linux environments, hosted primarily on Amazon Web Services (AWS)and orchestrated via Open Shift or Kubernetes
.

The ideal candidate bridges the gap between modern cloud architecture and robust system administration. If you have deep Linux expertise
, hands-on AWS experience
, and a passion for managing containerized workloads at scale, we want you on our team.

• Cloud Architecture & Support:Design, deploy, and maintain scalable, highly available infrastructure utilizing core AWS services
  (EC2, EKS, IAM, S3).
• Container Orchestration:Manage, scale, and optimize production Red Hat Open Shift or Kubernetes
  clusters (including AWS-managed solutions like EKS).
• Linux Platform Management:Administer, configure, and fine-tune enterprise Linux operating systems
  (Red Hat/Oracle Linux, Ubuntu) for optimal cloud performance.
• Infrastructure as Code (IaC):Drive automation by provisioning and managing AWS resources using Terraform
  or Ansible.
• Monitoring & Cost Optimization:Implement robust cloud monitoring, logging, and alerting systems while proactively optimizing AWS resource usage and costs.
• Security & Compliance:Enforce cloud security best practices, handling OS hardening, AWS IAM policies, and network security groups.
• Cross-Functional Collaboration:Partner with Dev and Dev Ops teams to ensure smooth application deployment pipelines and infrastructure resilience.

• Experience:5 years of experience
  in Systems Engineering or Cloud Operations role.
• AWS Expertise:Proven track record of configuring and managing production workloads in AWS environments
  .
• Linux Proficiency:Advanced administration skills, deep understanding of networking (TCP/IP, DNS, routing), and strong scripting abilities (Bash, Python).
• Containerization:Hands-on experience orchestrating containers with Open Shift
  or Kubernetes
  in enterprise settings.
• Automation Tools:Practical experience with infrastructure automation tools, specifically Terraform
  and Ansible
  .
• Problem-Solving:Analytical mindset with a strong track record of troubleshooting complex cloud and container infrastructure issues.

• Certifications:AWS Certified Sys Ops Administrator / Solutions Architect, Certified Kubernetes Administrator (CKA), or Red Hat certifications (RHCE).
• CI/CD Tools:Familiarity with modern deployment pipelines (Git Lab CI, Jenkins, ArgoCD).
• Cloud Networking:Advanced knowledge of AWS networking components, Transit Gateways, and hybrid cloud connectivity.

• Strong troubleshooting and problem-solving skills
• Self-motivation and proactive mindset
• Ability to prioritize and manage multiple tasks simultaneously
• Strong collaboration and teamwork skills
• Excellent communication abilities
• Flexibility and adaptability in a fast-paced environment
• Continuous improvement and quality-oriented mindset