IT Systems Administrator – Contract (Dublin, Ireland)
Hadfield Green is recruiting a senior IT Systems Administrator to serve as technical lead on a significant Cyber Security infrastructure programme within a critical, always-on operational environment.
Specialising in Microsoft technologies, this role bridges the IT Operations function and the Cyber Security Project Team — responsible for the design, planning, and delivery of security-driven infrastructure change.
You will work closely with internal and external stakeholders to build infrastructure and security architectures that meet business objectives, regulatory expectations, and strict service-level and availability requirements.
What You'll Do
Key Responsibilities
Serve as technical lead for Cyber Security infrastructure initiatives in a live 24/7 environment
Develop and implement industry best-practice infrastructure designs ensuring scalability, resilience, and security
Manage vulnerability assessment and security patch management programmes
Implement and test high-availability and disaster recovery strategiesProduce high-quality documentation for internal and external audit purposes
Provide infrastructure and security performance monitoring against agreed SLAs
Resolve escalated technical issues from first and second line support
Mentor junior staff and contribute to ongoing process improvement
Skills Required
MCSA, MCP and/or CCNA certified with expert-level Windows Server ************** implementation, administration, and Windows 11 client OS skills
Deep knowledge of Active Directory, Group Policy, network protocols, and concepts
Strong experience with backup solutions and principles; NetBackup knowledge an advantage
Proven analytical and problem-solving skills with the ability to work both independently and collaboratively across all levels of seniority
Strong organisational, documentation, and communication skills with proven experience working under strict process control methodologies such as ITIL
Virtual platform (VMware), storage technology, and Linux (RedHat/OEL) experience desirable
Proficiency with automation tools including Python, Ansible, and REST APIs desirable
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