Senior Systems Administrator (Windows Infrastructure)

ATG Europe; Noordwijk; On-site; EUR 70,000 - 100,000; Full time

Job summary

ATG Europe seeks a Senior System Administrator to support the European Space Agency on-site in Noordwijk, the Netherlands. You will manage on-prem SCCM infrastructure, Windows Server environments, AD, and security-compliant operations, ensuring high availability and accurate documentation.

The role requires 4+ years of enterprise Windows administration, ITIL-aligned processes, strong problem-solving and communication skills, and the ability to collaborate with cross-functional teams and external

Qualifications

• Experience administering enterprise Windows infrastructure (SCCM/ConfigMgr, AD, DNS, DHCP, GPOs).
• Experience with Windows Server administration and patching.
• Familiarity with ITSM and ITIL practices.

Responsibilities

• Administer and maintain on-prem SCCM infrastructure, including site servers, databases, and client health.
• Monitor system availability and performance; analyze alerts; implement corrective actions.
• Support ESA/ESTEC Labs users with Windows deployments, upgrades, and hardware changes.
• Manage server patching, software update deployments, and rollback when required.
• Perform OS deployment, packaging, and task sequences for server builds; maintain automation and troubleshoot failures.
• Maintain technical documentation and SOPs for audits and knowledge transfer.
• Collaborate on incident resolution, RCA, and infrastructure projects with cross-functional teams.
• Coordinate with IT services, networking, cybersecurity, and external suppliers; work on-site Monday to Friday 08:30–17:30.

Skills

Windows Server

Active Directory

PowerShell

ITSM

ITIL

ConfigMgr/SCCM

Documentation

Stakeholder management

Education

Master’s degree in computer science or related IT field

Relevant IT studies or equivalent qualifications

Tools

ConfigMgr/SCCM

Job description

We are looking for a Senior System Administratorto complete our consultants Workforce Management Serviceon behalf of the European Space Agency (ESA) for their location inNoordwijk,The Netherlands.Please beinformedthis position requires full on-site support.

Please note, the successful candidate will be employed by ATG Europe (or one of its subsidiaries). Furthermore, upon selection, they will be subject to a general security screening performed by an external provider (further information will be provided at the interview stage).

ATG is dedicated to diversity and inclusion and is an equal opportunity employer. Regardless of race, color, religion, sex, sexual orientation, gender identity, national origin, age, handicap any other reason protected by relevant state or municipal legislation, we are pleased to consider all eligible candidates for employment.

The successful candidate will be tasked with, but not limited to:

• Administer and maintain the on-premises Microsoft Configuration Manager (ConfigMgr/SCCM) infrastructure, including site servers, SQL databases, distribution and management points, boundaries, collections, and client health;

• Monitor system availability and performance; analyse logs, alerts, and user-reported incidents; and implement timely corrective and preventive actions;

• Support ESA/ESTEC Technology Labs users with Windows system deployments, upgrades, maintenance, and hardware changes, including memory, storage, and network interface components;

• Manage server patching and update deployment, including software update groups, maintenance windows, compliance reporting, remediation, and controlled rollback where required;

• Perform operating system deployment, application packaging, and task‑sequence management for server builds; maintain standardised automation and troubleshoot deployment failures;

• Maintain accurate technical documentation, configuration records, operating procedures, and evidence required for service reviews, audits, and knowledge transfer;

• Collaborate with team members on major incident resolution, root‑cause analysis, problem management, and the delivery and closure of infrastructure projects;

• Coordinate with corporate IT services, networking, cybersecurity, and facility management teams, as well as external suppliers where applicable;

• Work in accordance with ITSM practices and IT Service Operations processes and tools, with onsite presence Monday to Friday from 08:30 to 17:30.

• Master’s degree in computer science, information technology, systems engineering, or a related discipline, with at least four years of relevant professional experience; or

• Relevant IT studies or equivalent technical qualifications, with at least ten years of progressively responsible experience in enterprise Windows infrastructure administration;

• Strong professional communication, stakeholder-management, and teamwork skills, with the ability to explain technical matters clearly and produce concise operational documentation;

• Advanced hands‑on knowledge of Microsoft Configuration Manager (ConfigMgr/SCCM), including infrastructure administration, client management, software distribution, patching, application packaging, operating system deployment, task sequences, and compliance reporting;

• Strong Windows Server administration skills, including hands‑on knowledge of Active Directory Domain Services (AD DS), domain controllers, users and groups, organisational units, Group Policy, trusts, replication, delegation, authentication, permissions, DNS integration, Active Directory SSO, Kerberos, PowerShell scripting, security hardening, and troubleshooting in enterprise environments;

• Sound understanding of network and storage fundamentals, including firewalls, routers, switches, DMZs, WAN, LAN/VLANs, VPNs, NAS, SAN, Active Directory SSO, and Kerberos;

• Practical knowledge of infrastructure monitoring, log analysis, capacity and performance management, backup and recovery principles, and incident diagnostics;

• Demonstrated experience working within controlled enterprise environments, applying change, configuration, incident, problem, and security‑management procedures;

• Excellent analytical, problem‑solving, and decision‑making skills, with the ability to work independently, prioritise competing demands, and operate effectively with limited supervision;

• Proven knowledge of ITSM good practices; ITIL Foundation certification (version 3 or 4) is preferred;

• Relevant Microsoft or infrastructure certifications are an advantage. The successful candidate must be willing to complete additional certifications through the ATG training programme;

• Interest in space‑related engineering activities and ESA programmes, with an appreciation of service continuity, information security, and operational reliability;

• Fluency in spoken and written English at CEFR level B2 or above; knowledge of additional languages is an advantage;

• Candidates must be eligible to work in the EU.

• Due date: 2026-10-07