Senior Systems Administrator

CrowleysDFK; Dublin; Hybrid; EUR 65,000 - 90,000; Full time

Benefits offered by this job

Flexible working hours

Hybrid working structure

Work from Anywhere policy

Competency and Career Paths Framework

Learning & Development Programme

Health and wellbeing initiatives and培训

Sports & Social Team

Charity Partner

3pm finish Fridays

Birthday day off

Job summary

Crowleys DFK is seeking a Senior Systems Administrator for our Dublin office. The role is hybrid (2 days in-office), full-time, 37.5 hours per week, focusing on managing infrastructure, cybersecurity, and Microsoft 365 environments.

You will work on governance, compliance, and cloud migrations, collaborating with a professional services team in a regulated environment. Relevant certifications and strong problem-solving skills are encouraged.

Qualifications

• 5+ years in systems/infrastructure administration.
• 2+ years in a Senior Systems Administrator role.
• Strong knowledge of AD/Entra and identity management.
• Networking, firewalls, VPNs and endpoint security understanding.

Responsibilities

• Manage and monitor core IT infrastructure and systems.
• Administer Microsoft 365 including Exchange Online, Teams and SharePoint.
• Manage Entra ID/AD, identities, access controls.
• Support Windows server and endpoints.
• Maintain system documentation and records.
• Lead ICT projects and drive continuous improvement.

Skills

Microsoft Entra ID/AD

Networking basics

Windows Server

Troubleshooting

Cybersecurity awareness

Tools

Microsoft 365

Intune

ISO 27001

Job description

At Crowleys DFK we recognise that it’s our people who make us who we are. We pride ourselves on our value‑based culture which creates a caring, inclusive, innovative and collaborative environment – a culture where you can take your career to the next level. We celebrate the different skillsets, backgrounds, and talents in all our people and are always looking for experienced professionals to join our team.

If you want to work for a progressive and successful firm, one founded on teamwork and that offers you support at every stage of your career, then that firm is Crowleys DFK!

What we can offer you:

• Flexible Working hours , Hybrid Working structure, Work from Anywhere policy
• Multiple internal growth and career progression opportunities through our Competency and Career Paths Framework anda comprehensive Learning & Development Programme to develop your skills and knowledge.
• Focus on your mental health with our health and wellbeing initiatives and training.
• Participate in exciting events and activities organised by our Sports & Social Team and make an impact on the community by getting involved with our chosen Charity Partner.
• Kickback and relax by enjoying year-round 3pm finish Fridays and a paid day off on your Birthday.

About the opportunity:

Due to exciting and continued growth, our ICT department are looking for a Senior Systems Administrator to join their team in our Dublin office. The role is hybrid (2 days in the office), full-time permanent, with a 37.5-hour work week.

You can expect your duties will include but not limited to:

Infrastructure & Systems Administration

• Manage, maintain and monitor the firm’s core IT infrastructure and systems.
• Administer Microsoft 365, including Exchange Online, Teams, SharePoint and related services.
• Manage Microsoft Entra ID/Active Directory, user identities, permissions and access controls.
• Support Windows server and endpoint environments.
• Manage infrastructure including networking, firewalls, Wi‑Fi, VPN and connectivity.
• Monitor system capacity, availability and performance and proactively address issues.
• Manage system patching, upgrades and maintenance.
• Support backup, recovery and business continuity arrangements.
• Maintain accurate technical documentation, configurations and system records.

Cybersecurity

• Play a key operational role in maintaining and improving the firm's cybersecurity controls.
• Monitor and respond to security alerts, vulnerabilities and incidents.
• Support vulnerability management, patch management and remediation activities.
• Manage and review privileged access, MFA and other identity security controls.
• Support cybersecurity audits, assessments and certification activities.
• Assist with the continued development of the firm's security framework.
• Work with external security and technology providers where specialist assistance is required.
• Promote good cybersecurity practices across the firm.

Microsoft 365 & Cloud

• Act as a technical administrator for the firm’s Microsoft 365 environment.
• Manage security, access and configuration across the Microsoft cloud environment.
• Troubleshoot complex Microsoft 365 issues and elevate to suppliers/Microsoft where appropriate.
• Support the adoption and secure implementation of new Microsoft technologies and services.
• Assist with configuration and governance of emerging technologies, including AI-enabled services.
• Act as a senior escalation point for complex technical issues that cannot be resolved through standard ICT support.
• Diagnose and resolve infrastructure, application, connectivity and user issues.
• Provide technical guidance to other members of the ICT team.
• Liaise with third‑party suppliers and manage technical issues through to resolution.
• Identify recurring issues and implement permanent solutions rather than relying on workarounds.

Projects & Continuous Improvement

• Participate in and, where appropriate, lead technical elements of ICT projects.
• Support system implementations, migrations, integrations and upgrades.
• Identify opportunities to improve ICT resilience, security, automation and efficiency.
• Evaluate new technologies and recommend appropriate solutions.
• Support ICT aspects of office changes, business growth and integration activities.
• Ensure appropriate testing, documentation and handover accompanies system changes.

Governance & Compliance

• Ensure systems are administered in line with the firm's ICT and information security policies.
• Support GDPR, data security and regulatory requirements from a technical perspective.
• Maintain appropriate system documentation and audit evidence.
• Participate in technology risk assessments and security reviews.
• Support disaster recovery and business continuity testing.

What we are looking for:

• Minimum 5 years' experience in systems/infrastructure administration, including at least 2 years in a Senior Systems Administrator or equivalent role.
• Strong knowledge of Microsoft Entra ID/Active Directory and identity/access management.
• Strong understanding of networking, firewalls, VPNs and endpoint security.
• Experience with backup and disaster recovery technologies.
• Good understanding of cybersecurity principles and controls.
• Strong troubleshooting and problem‑solving skills.
• Ability to independently manage complex technical incidents.
• Ability to communicate technical matters clearly to non‑technical colleagues.
• Significant hands‑on experience in systems administration or infrastructure support.
• Experience within a professional services or similarly regulated environment.
• Microsoft technical certifications.
• Cybersecurity qualifications or certifications.
• Experience with ISO 27001, Cyber Essentials Plus or similar security frameworks.
• Experience supporting cloud migrations or major infrastructure projects.
• Experience with Microsoft Intune and modern endpoint management.
• Experience with security monitoring, vulnerability management and incident response.