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 OpenShift 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.

🔎Key Responsibilities

•  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 OpenShift or Kubernetes clusters (including AWS-managed solutions like EKS).
• Linux Platform Management: Administer, configure, and fine-tune enterprise Linux operating systems (RedHat/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 DevOps teams to ensure smooth application deployment pipelines and infrastructure resilience.

✅Qualifications & Experience

• 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 OpenShift 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.

✅Preferred Attributes

• Certifications: AWS Certified SysOps Administrator / Solutions Architect, Certified Kubernetes Administrator (CKA), or Red Hat certifications (RHCE).
• CI/CD Tools: Familiarity with modern deployment pipelines (GitLab 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

🚀 Ready to take the next step in your Cyber Security career?

📩 For more information, contact us at 4u@actionline.gr or 📞 210 3637822