--- title: 'Senior Full Stack .NET Developer at Spektrum' canonical: 'https://feeny.ai/job/senior-full-stack-net-developer-spektrum-capellen-jhwm4fdrj6sx' type: 'job' last_seen: '2026-09-10' --- # Senior Full Stack .NET Developer at Spektrum - **Company:** Spektrum - **Location:** Capellen, Luxembourg - **Posted:** 2024-07-07 - **Last confirmed live:** 2026-09-10 - **Apply:** https://spektrum-group.com/jobs?gh_jid=4362653101 ## Job description Spektrum supports apex purchasers (NATO, UN, EU, and National Government and Defence) and their Tier 1 supplier ecosystem with a wide range of specialist services. We provide our clients with professional services, specialised aerospace and defence sales, delivery, and operational subject matter expertise. We are looking for personnel to join our team and support key client projects. ## Who we are supporting The NATO Support and Procurement Agency (NSPA) is a key agency within the North Atlantic Treaty Organization (NATO) focused on providing comprehensive logistics, procurement, and support services to NATO member countries, partners, and other customers. The NSPA facilitates the collective acquisition and management of goods and services, ranging from military equipment to general supplies, enhancing the efficiency and effectiveness of NATO operations. The agency's responsibilities include: - Procurement - Managing the acquisition of a wide range of goods and services, including military equipment, supplies, and support services. - Logistics - Offering logistics support such as transportation, warehousing, and distribution to ensure that NATO forces have the necessary resources when and where they are needed. - Maintenance - Providing maintenance and repair services for military equipment, ensuring operational readiness, and extending the lifespan of assets. - Project Management - Overseeing and implementing various projects, including infrastructure development and other support activities. The NSPA operates under the direction of the NATO Support and Procurement Organization (NSPO), which sets the strategic goals and policies for the agency. By centralizing and standardizing procurement and logistics services, the NSPA helps NATO members achieve cost savings, improved interoperability, and enhanced operational capability. The program The NATO Support and Procurement Agency (NSPA) requires Project Support and Operation and Maintenance (O&M) consultancy services for implementing, operating and maintaining complex eBusiness solutions integrated in the NSPA environment, using the latest web technologies, Relational and non-Relational Databases, integration techniques and standards (synchronous and asynchrounous interfaces), cyber security layers and concepts. ## Role Background The scope of the role involves implementation, operations and maintenance of complex e-Business solutions based on Microsoft .NET technologies, relational and non-relational databases and the latest development frameworks and libraries available for web-based solutions. ## Role Duties and Responsibilities - Implementation of complex e-business solutions using Microsoft .NET technologies. - Use .NET framework and C# expertise to build web applications, handling both front-end and back-end development. - Implement various application architectures such as MVC, microservices, event-driven, and model-driven designs in applications. - Build responsive user interfaces using Single Page Application frameworks (Angular or React), HTML5, and Bootstrap. - Managing and optimizing SQL and Oracle databases. - Write secure, optimized code and manage version control using Git. Essential Skills and Experience - Proven experience of at least 5 years - on medium/large projects – on development of complex architectures for web-based systems based on Microsoft technologies. - Proven experience and skills in the following areas: - Proficiency in .NET frameworks and C# - Experience with various application architectures: MVC, Micro-services architectures based on REST API and message broker, Event Driven Architecture, Model Driven Design. - Experience with Single Page Application Frameworks (like Angular or React), HTML5, and Bootstrap. - Very good knowledge and proven experience of database management systems such as Microsoft SQL Server and Oracle. - Experience in writing secure code and cyber security, maintaining optimization and efficiency. - Experience with version control systems such as Git. - Knowledge of software development tools, methodologies, and best practices. - Very good knowledge on data modelling. - Ability to explain issues at different levels of the hierarchy. - Ability to write clear and concise reports and technical documentation. Language - Proficiency in English, written and oral, equivalent to CEFR B2 or higher Working Location - Capellen, Luxembourg Contract Duration - 3 years with 2 one year extensions Working Policy - On-Site Travel - Travel to other NATO sites may be required occasionally Security Clearance - Valid National or NATO Secret personal security clearance ## About Spektrum ## Company Overview - **One-liner**: Spektrum Group is a specialist consultancy that enables clients to navigate the complex defence, humanitarian, and government markets by connecting them with a fast-growing global network of subject matter experts, partners, and suppliers. - **Entity Type**: Private (stage not disclosed; no public funding rounds identified) - **Headquarters**: Multiple offices; global presence with registered addresses in Spain (Barcelona, ES: +34 932 712 919), the United Kingdom (Leeds, UK: +44 113 868 3500), Belgium (Mons), the Netherlands (The Hague), the United States (Norfolk, VA), and Norway (Stavanger). No single global HQ is explicitly designated. - **Founded**: Not publicly available - **Founders**: Not publicly available ## Core Business - **Industry/Industries**: Aerospace & Defence, Humanitarian Aid, Government Services, Consulting & Advisory - **Target Customers**: International institutional organisations (e.g., UN, NATO), English-speaking national governments, and ministries of defence (apex purchasers), as well as the broader defence ecosystem (from small specialists to global enterprises) - **Mission / Purpose**: “Thinking differently to make a difference” – Spektrum aims to solve today’s aerospace and defence market problems, acting as a force for good with a sincere intent to positively impact its clients and their teams. ## Products & Services - **Consulting**: Strategic advisory, market navigation, and subject matter expertise for clients aiming to achieve aerospace and defence objectives. - **Logistics and Supply**: Supply chain support and logistics management tailored to complex defence and humanitarian environments. - **Communication**: Strategic communication services, including social media scripting and event promotion (as evidenced by job postings for Social Media Scripter). - **Events**: Planning and execution of events for defence, humanitarian, and government stakeholders. *Additional note:* Spektrum Labs (a related entity) is described as “building the backbone of the cyber resilience ecosystem, unifying cybersecurity, compliance, and insurance into one seamless platform powered by AI, cryptography, and automation,” but Spektrum Labs appears to be a separate brand under the Spektrum umbrella. ## Market Standing - **Valuation / Market Cap**: Not publicly available (private company) - **Key Metric**: Unspecified revenue; total funding not disclosed. However, rapid hiring (112+ open roles listed on Built In) suggests strong growth and demand. - **Notable Investors / Partners**: Not publicly disclosed. The company states it is a “Member Of” unspecified organisations, a “Registered supplier to” key entities, and holds certifications (logos visible on website but not named in the provided results). - **Growth Signals**: - Fast-growing global network of partners and suppliers - 112+ job openings across multiple countries and disciplines (engineering, IT, talent acquisition, contract management, assurance, etc.) - Offices in at least six countries (Spain, UK, Belgium, Netherlands, USA, Norway) ## Competitive Advantages - **Deep Niche Expertise**: Focus exclusively on the challenging and complex defence, humanitarian, and government sectors, an area many traditional consultancies avoid. - **Global Network**: Extensive ecosystem of subject matter experts, partners, and suppliers that can be rapidly deployed to solve client problems. - **Apex Payer Focus**: Directly targets the highest-level purchasers within institutional organisations and ministries of defence. ## Strategic Focus - Priority is to help clients navigate the increasingly complex landscape of international defence and government procurement. - Emphasis on building a “resilient and effective” supplier ecosystem through diversity and capability. - Continuous improvement of internal processes and client support, with a culture of questioning everything to drive growth. ## Why Work Here - **Culture Highlights**: Values include transparency, effective communication, enthusiasm and fun, and setting ambitious yet realistic goals. Employees celebrate successes together and maintain a friendly, relaxed environment. - **Work Policy**: Hybrid workspace is available, with some roles offering a combination of remote and on-site work, while others (e.g., in The Hague, Brussels, Norfolk) are labeled “In-Office” on Built In. Policy likely depends on role and location. - **Notable Perks / Engineering Culture**: Not explicitly described, but career growth is supported by a wide range of senior and junior roles. The company places “great emphasis on supporting and collaborating with our team and clients.” Spektrum Labs’ focus on AI, cryptography, and automation indicates a forward-leaning engineering culture in the cybersecurity arm. ## Sources 1. [Spektrum Group – Official Website](https://spektrum-group.com/) 2. [Spektrum Group – About Us](https://spektrum-group.com/about-us) 3. [Spektrum Group – What We Do](https://spektrum-group.com/what-we-do) 4. [Spektrum Group – Jobs Page](https://spektrum-group.com/jobs) 5. [Built In – Spektrum Group Careers & Culture](https://builtin.com/company/spektrum-group) 6. [Spektrum Group – Greenhouse Careers Page](https://job-boards.greenhouse.io/spektrum) ## Other roles at Spektrum - [Business Process Analyst – Quality Systems & SharePoint](https://feeny.ai/job/business-process-analyst-quality-systems-sharepoint-spektrum-the-hague-p0w1f4kpjr9k) — The Hague, Netherlands - [Principal Project Manager](https://feeny.ai/job/principal-project-manager-spektrum-brussels-2gcr4te86j7h) — Brussels, Belgium - [Splunk Engineer](https://feeny.ai/job/splunk-engineer-spektrum-mons-3wevsc3be1wc) — Mons, Belgium - [Senior Camunda Developer](https://feeny.ai/job/senior-camunda-developer-spektrum-the-hague-e1bed02fgpg8) — The Hague, Netherlands - [NATO Training & Workforce Analyst – Data & AI](https://feeny.ai/job/nato-training-workforce-analyst-data-ai-spektrum-oeiras-ejrb169sg475) — Oeiras, Portugal - [Electromagnetic Operations (EMO) Training Specialist](https://feeny.ai/job/electromagnetic-operations-emo-training-specialist-spektrum-oeiras-1a22z27gez06) — Oeiras, Portugal - [Administrative & Reporting Coordinator](https://feeny.ai/job/administrative-reporting-coordinator-spektrum-mons-qwyyenp71p9t) — Mons, Belgium - [Endpoint Security Assistant](https://feeny.ai/job/endpoint-security-assistant-spektrum-mons-gap6m7bxjdpj) — Mons, Belgium - [Vulnerability Management Engineer](https://feeny.ai/job/vulnerability-management-engineer-spektrum-mons-e9xvs1qm2246) — Mons, Belgium - [Firewall Engineer](https://feeny.ai/job/firewall-engineer-spektrum-mons-4n7a5w34qtgn) — Mons, Belgium