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Spektrum Management Group

Aerospace, defense and government support

Senior Application Support Engineer

Full-TimeUpdated on 10/15/2026
No salary listed
Mid
Braine-l'Alleud, Belgium
HybridHybrid schedule with 50% on-site; some travel to other NATO sites may be required.
IT OperationsEnterprise Applications, IT Service Desk & End User Support

About the job

Requirements
  • Deep understanding of end-user devices, including desktops, laptops, tablets, smartphones, Windows operating systems, Android operating systems, and Apple iPhones and iPads.
  • Expert knowledge of Linux server infrastructure, Windows server infrastructure, and Active Directory.
  • Expert knowledge of Microsoft SQL Server 2019–2025 and IIS-based web applications.
  • Very good understanding and experience with AI and large language models, including cloud- and on-premises-based large language models, agentic systems development, AI and large language model integration, MLOps, and AI lifecycle management.
  • Deep understanding of networking infrastructure.
  • Very good knowledge of cloud technologies and deployment for AWS and Azure.
  • Deep understanding of public key infrastructure.
  • Expert knowledge of software engineering technologies and standards, including at least four of HTML5, REST and web services, XML, HTTP, SQL, and Visual Basic for Applications.
  • Knowledge of identity management and application integration using OAuth, OIDC, and SAML2.
  • Knowledge of application server technologies and relational database management systems.
  • Knowledge of programming languages and platforms including .NET/C#, Java, and JavaScript.
  • Knowledge of task automation through scripting in both Windows and Linux.
  • Deep understanding of security constraints and requirements in communications and information systems.
  • Deep understanding of NCIA and NATO security directives and regulations, industry best practices, and standards.
  • Familiarity with Microsoft services and tools including Outlook, Teams, and SharePoint.
  • Experience and good knowledge of COTS technologies including IIS, JBoss, Apache Tomcat, and .NET-based applications.
  • Extensive experience deploying and managing client-server applications, application integration, and data transformation for application integration.
  • Strong troubleshooting skills to diagnose and resolve hardware, software, and network issues.
  • Ability to guide users through problem-solving steps effectively.
  • Full proficiency in English.
  • Ability to communicate technical information clearly to non-technical users.
  • Ability to work in cross-functional application management and deployment teams.
  • Strong customer-service focus and commitment to user satisfaction, with patience and empathy when addressing user issues and concerns.
  • Ability to manage multiple support tickets, prioritize tasks, document support activities, and maintain accurate records.
  • At least three years of relevant experience in computer science or electronic engineering.
  • Very good knowledge across areas of software engineering, including requirements elicitation and management, non-functional requirements for operations and maintenance, software change management and testing, software design, implementation and testing, software engineering techniques and methodologies, application release and deployment management, configuration management practices and tools, and application lifecycle management concepts and tools.
  • Ability to work effectively as part of a team and share knowledge and resources.
  • Strong customer relationship skills, including negotiating complex and sensitive situations under pressure.
  • Prior experience in an international environment comprising military and civilian elements.
  • Valid National or NATO Secret personal security clearance.
Responsibilities
  • Deploy and manage server applications running on Windows or Linux servers.
  • Integrate applications with identity providers.
  • Support the creation and deployment of client applications on end-user workstations.
  • Gather and report metrics and key performance indicators.
  • Support in-service operations of systems.
  • Support and operate assigned systems used by the NATO enterprise community and local commands.
  • Manage and configure Atlassian products.
  • Maintain operational and support environments and monitor the performance of assigned service applications.
  • Support CIS Support Units and other support staff in daily system operations.
  • Manage Entra ID groups and roles, and manage and configure cloud components.
  • Deploy, configure, and support AI-based solutions, tools, and agents.
  • Support the integration of AI with COTS applications in production environments, including ongoing monitoring, maintenance, and support.
  • Provide support services in accordance with service-level agreements and NCI Agency support levels, roles, and responsibilities.
  • Provide second- and third-level support for end-user queries.
  • Troubleshoot and resolve software issues and problems to minimize disruption and ensure efficient use of resources.
  • Communicate solutions and advice to customers and users.
  • Monitor incident-management processes for tickets created in the helpdesk ticketing system.
  • Log and track support incidents in the helpdesk ticketing system, ensuring tickets contain accurate, detailed information and are resolved within agreed service levels.
  • Escalate complex issues to vendor support or appropriate teams and follow up to ensure timely resolution and user satisfaction.
  • Create and maintain knowledge-base documentation of common issues and solutions, and share knowledge and best practices with team members.
  • Contribute to analysis and documentation of new requirements and change requests.
  • Participate in reviews of requirements definitions, software design and functional or technical analysis, system specifications, and other deliverables.
  • Control, manage, and provide access to restricted areas managed by the business area.
  • Ensure the proper functionality and security of software and hardware managed by NBAC.
  • Monitor COTS applications and other NBAC-managed software, identifying and reporting infrastructure, hardware, and software application problems.
  • Support the NBAC team in security approval and accreditation of software applications and communications and information systems.
  • Control and check compliance with NCIA and NATO security regulations for software and hardware used in NBAC services.
  • Gather functional and non-functional requirements, including drafting system specifications.
  • Support technical reviews, walkthroughs, and audits.
  • Support preparation of functional and technical specifications for software and hardware, with a focus on the SSBA business area domain.
  • Support change management, configuration management, release and deployment, and testing.
  • Work with and provide input to service delivery managers, project managers, portfolio managers, and other stakeholders.
  • Communicate with users to understand their issues and provide clear instructions, and collaborate with NCIA and vendor teams.
  • Travel to other NATO sites as required.
Desired Qualifications
  • French language proficiency is desirable and an advantage.

About the company

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Spektrum Management Group

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Spektrum Management Group provides consulting, staffing, logistics and market support across defense, humanitarian and government sectors. It helps clients plan, win, deliver and operate programs, recruits specialist personnel and coordinates products or support for demanding locations. The company focuses on international institutions, English-speaking governments and ministries of defense, with documented work supporting NATO requirements. Its model combines subject-matter experts, supplier networks and project teams rather than acting only as a recruitment agency or equipment reseller.

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