Mid-Senior Systems Engineer (Linux, K8s/OpenShift & AWS)

About the role

Actionline, a Greek HR and recruitment company, is recruiting on behalf of its client, a leading energy-sector company, for a Mid-Senior Systems Engineer based in Athens. The role is full-time and on-site, and focuses on managing, automating and scaling enterprise Linux environments hosted mainly on AWS and orchestrated with OpenShift or Kubernetes.

Key responsibilities

• Design, deploy and maintain scalable, highly available infrastructure using core AWS services (EC2, EKS, IAM, S3)
• Manage, scale and optimise production Red Hat OpenShift or Kubernetes clusters, including AWS-managed solutions such as EKS
• Administer and tune enterprise Linux systems (RedHat/Oracle Linux, Ubuntu) for cloud performance
• Provision and manage AWS resources with Terraform or Ansible
• Set up monitoring, logging and alerting, and optimise AWS resource usage and costs
• Enforce cloud security best practices, including OS hardening, IAM policies and network security groups
• Work with Dev and DevOps teams to support application deployment pipelines

Required profile

• 5 years of experience in Systems Engineering or Cloud Operations
• Proven track record of configuring and managing production workloads in AWS
• Advanced Linux administration and strong scripting (Bash, Python)
• Hands-on experience with OpenShift or Kubernetes in enterprise settings
• Experience with Terraform and Ansible
• Analytical approach to troubleshooting complex cloud and container issues

Preferred attributes

• AWS Certified SysOps Administrator / Solutions Architect, CKA or Red Hat certifications (RHCE)
• Familiarity with GitLab CI, Jenkins or ArgoCD
• Advanced knowledge of AWS networking, Transit Gateways and hybrid cloud connectivity