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

> Actionline Ltd. · Athens, Greece · Full-time · Posted 2026-09-04

**Workplace:** on_site

**Department:** O-HDN011

## Description

🏢 **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

**🔹 Position Overview**

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.

 **🎯 Personal Skills**

-   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**](mailto:4u@actionline.gr) or 📞 **210 3637822**

## Benefits

[](mailto:4u@actionline.gr)

## Apply

[Apply at Actionline Ltd.](https://apply.workable.com/actionline-ltd/j/7AEC2E161D/apply)

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