Senior Systems Administrator

Department: Ireland-Technology

Employment Type: Full Time

Location: Ireland

Description

At Bluefin, we thrive in a dynamic and fast-paced environment where innovation and leadership are at the forefront of everything we do. Join us in revolutionizing data security within the integrated payments industry, as we protect over 35,000 companies across 59 countries with our cutting-edge encryption and tokenization technologies. Our collaborative culture empowers you to take initiative and make impactful contributions, while our commitment to professional growth ensures you have the tools and opportunities to excel. Embrace the challenge of working in a vibrant atmosphere that values agility and leadership, and be part of our mission to create secure, frictionless experiences for businesses and their customers. If you’re ready to drive change and make a difference, we invite you to embark on this exciting journey with us!
We are seeking a Senior Systems Administrator to ensure the availability, performance, scalability, and security of systems across hybrid environments with a strong emphasis on containerized infrastructure and Kubernetes orchestration. This role requires experience in high-availability production environments and a deep understanding of modern infrastructure automation, monitoring, and container operations. You will join a technology-forward payment processing company where security, compliance, and reliability are mission-critical. This role reports to the Systems Admin, Team Lead.

Essential Duties and Responsibilities

• Administer and support Linux- and Windows-based systems across cloud, virtual, and on-premises environments
• Design, deploy, and maintain containerized applications using Docker and orchestrate workloads with Kubernetes
• Collaborate with DevOps and development teams to support CI/CD pipelines, automate deployments, and troubleshoot infrastructure and application issues
• Build and maintain infrastructure as code using tools like Terraform, Helm, or Ansible
• Implement and manage monitoring, alerting, and logging for containers and system services
• Lead system upgrade efforts and ensure systems are patched and compliant with industry standards
• Contribute to a culture of continuous improvement by automating repetitive tasks and workflows
• Document infrastructure, processes, and deployment procedures thoroughly and consistently
• Participate in an on-call rotation to provide after-hours support for production systems
• Assist in the planning and execution of disaster recovery and high-availability strategies
• Maintain and enhance our existing virtual environments (VMware) and cloud-based infrastructure (AWS preferred)
• Support security efforts including hardening, vulnerability mitigation, and compliance with PCI-DSS and OWASP standards
• Partner with cross-functional teams on infrastructure planning and scaling initiatives

Skills and Qualifications

To perform this job successfully, the individual must be able to perform each essential duty satisfactorily. The requirements listed below are representative of the knowledge, skill, and/or ability required. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions:

• Proven ability to administer, scale, and secure containerized environments (Docker, Kubernetes) in production
• Familiarity with Hypervisors (Proxmox, Vmware)
• Proficiency with Linux system administration, particularly RedHat/Oracle Linux
• Strong scripting and automation skills (Bash, Python, PHP, or similar)
• Familiar with cloud-native technologies, microservices, and networking in a Kubernetes context
• Experience with AWS infrastructure and services (EC2, EKS, S3, IAM, etc.) is a strong plus
• Proficient in managing and troubleshooting networking issues (TCP/IP, DNS, HTTP/S, SNMP, etc.)
• Familiarity with CI/CD tools such as Jenkins, GitLab CI, or ArgoCD
• Knowledge of web servers and proxies: Apache, Tomcat, NGINX
• Experience with load balancers, GSLB, and WAFs (Imperva, F5)
• Competent with database administration: (SQL Server)
• Understanding of encryption technologies (TLS, RSA, AES, etc.) and security standards (PCI DSS, ISO 27001, OWASP)
• Strong verbal and written communication skills, with the ability to collaborate across teams
• Proficient using Word, Excel, Outlook and ability to multi-task

Education/Experience: 

• Bachelor’s degree in Computer Science, Engineering, Information Systems, or equivalent experience
• 7+ years in a systems administration, infrastructure, or DevOps role