IT System Administrator III in Portsmouth

IT System Administrator III | Senior Systems & Network Administrator

DART Aerospace | Information Technology

About DART Aerospace

DART Aerospace is a global aerospace company specializing in the design, manufacturing, and distribution of mission-critical equipment and solutions for the aviation industry.

Operating across multiple international locations, we combine technical excellence, innovation, and operational expertise to support customers worldwide.

We are looking for an experienced IT System Administrator III – Senior Systems & Network Administrator to join our IT team and play a key role in maintaining, securing, and optimizing our technology infrastructure.

The Opportunity

Reporting to the IT Director, you will be responsible for the administration, configuration, security, and reliable operation of our systems, networks, servers, and cloud infrastructure.

This senior-level position combines hands‑on systems administration, network engineering, cybersecurity, and infrastructure optimization within a multinational manufacturing environment.

We are seeking an experienced IT professional capable of working independently, resolving complex technical challenges, and contributing to infrastructure modernization and operational continuity.

Key Responsibilities

Systems & Infrastructure Administration

• Maintain, configure, and optimize Windows Server and/or Linux environments.
• Administer physical and virtual servers, including VMware and Hyper‑V.
• Manage on‑premises and cloud infrastructure, including Microsoft Azure, AWS, or comparable platforms.
• Perform system upgrades, patch management, backups, and disaster recovery activities.
• Maintain Active Directory, DNS, DHCP, user permissions, and identity/access management.
• Develop technical documentation, system configurations, and infrastructure specifications.

Network Administration & Security

• Design, implement, and maintain LAN/WAN infrastructure, VPNs, firewalls, switches, and routers.
• Monitor network performance, availability, and security vulnerabilities.
• Troubleshoot complex networking and connectivity issues.
• Implement and maintain cybersecurity protocols, security controls, and IT best practices.
• Support infrastructure security improvements and proactive risk mitigation.
• Ensure infrastructure reliability and business continuity across IT environments.
• Develop and maintain PowerShell scripts to automate administrative processes and improve efficiency.
• Support infrastructure modernization, upgrades, and technology integration projects.
• Identify opportunities to optimize system performance, security, and operational efficiency.
• Contribute to IT process improvements and infrastructure standardization.

Technical Support & Collaboration

• Diagnose and resolve advanced hardware, software, server, and network issues.
• Provide technical support and guidance to internal teams.
• Collaborate with IT colleagues and business stakeholders across different locations.
• Communicate technical information effectively to both technical and non-technical audiences.
• Maintain accurate documentation of incidents, technical solutions, and system changes.

Required Qualifications

• 5–10 years of professional experience in systems administration and network administration.
• Strong hands‑on experience with Windows Server and/or Linux.
• Advanced knowledge of networking technologies, including TCP/IP, VLANs, routing, switching, VPNs, and firewalls.
• Demonstrated experience administering Active Directory, DNS, DHCP, and access controls.
• Strong experience with virtualization platforms such as VMware or Hyper‑V.
• Working knowledge of Microsoft Azure, AWS, or similar cloud platforms.
• Experience with PowerShell scripting and IT automation.
• Solid understanding of cybersecurity principles, infrastructure security, and best practices.
• Proven troubleshooting and analytical problem‑solving abilities.
• Ability to manage complex technical issues independently.
• Excellent communication, documentation, and collaboration skills.
• Fluent English, both written and spoken, is required.

Preferred Qualifications

• Experience supporting IT infrastructure in a manufacturing, aerospace, or multinational organization.
• Knowledge of ERP systems, including SAP, Microsoft Dynamics NAV, or Plex Manufacturing.
• Experience with Power BI, including development or programming.
• Hands‑on experience with Artificial Intelligence (AI) tools and technologies.
• Experience with infrastructure optimization, automation, or IT transformation initiatives.
• Working proficiency in French and/or Spanish is a strong asset.

Export Control & Eligibility Requirements

This position may involve access to export‑controlled information and technology.

Candidates must satisfy applicable international trade compliance and access authorization requirements.

British citizenship is currently specified as an eligibility requirement, subject to confirmation under applicable export‑control and employment regulations.

Why Join DART Aerospace?

• Join an established international aerospace organization.
• Work with diverse technologies across systems, networks, cybersecurity, and cloud environments.
• Contribute to infrastructure modernization and technology improvements.
• Collaborate with international IT and business teams.
• Take ownership of complex infrastructure challenges in a dynamic manufacturing environment.
• Make a direct impact on operational reliability, security, and business continuity.

DART Aerospace is committed to equal employment opportunities and an inclusive workplace.