Domain Architect NNA

You are part of the NBU/NIT organization (Network IT), within the NAA domain (Network Activation & Automation). This domain manages and evolves OSS (Operations Support Systems) that enable the activation of Telco services-Data, TV, Internet, Voice, and more-across the various Proximus networks for customer-facing divisions such as CBU, EBU, and CWS.

Beyond daily operational support, Proximus OSS is undergoing a major transformation to align with a modern, open, digital network vision. This includes adopting industry standards such as TMF and leveraging cloud technologies like Azure, while integrating new technological capabilities including 5G, SD-WAN, and uCPE.

In this context, your role as Domain Architect is to collaborate with peers in defining and realizing the next-generation OSS stack, ensuring alignment with Proximus strategic architecture, business needs, and market best practices. You'll the end-to-end view of the activation chain-from requirements clarification to solution design, E2E test definition, and operational support-for both simple and highly complex projects.

Responsabilities

As a Domain Architect, you will:

Strategic Alignment

• Understand the business vision, strategy, and project roadmaps.
• Ensure complete, relevant, and clear operational requirements are captured.
• Contribute to the creation of an OSS architecture roadmap, defining realistic steps aligned with business priorities.
• Promote industrialized, reusable, automated solutions over point fixes; align designs with TMF best practices and NIT strategy.

Solution Architecture

• Translate functional and non-functional requirements into reliable, scalable, and efficient architecture designs by producing functional blueprints (context/flow diagrams, sequence diagrams, information models), E2E activations flows and integration patterns (API/Event-driven).
• Work collaboratively with domain architects, functional analysts, and technical teams to deliver end-to-end solutions across applications.
• Provide continuous architecture support to delivery teams (backlog refinement, design clarifications, decision logs).
• Convert the roadmap into EPICs and user stories that drive delivery within the new OSS solution.

Cross-Domain Collaboration

• Engage with colleagues across NBU and DTI to understand the impact of projects on Proximus networks by acting as single solution contact for OSS
• Provide coaching and guidance to promote NIT's vision and strategic direction.

E2E Quality & Operational Readiness

• Define E2E OSS test strategy & scenarios covering business flows, non-functional requirements and operational use-cases (happy paths, fallouts, …
• Ensure smooth handover to operations with up-to-date documentation and knowledge transfer

Do you have experience in Waterfall?, Do you have a Master's degree?, * Master's degree in IT or telecommunications, or equivalent professional experience.

• Strong background in IT architecture within complex environments.
• Hands-on with agile methodologies, with familiarity in waterfall models and UML.
• Proven experience in telco OSS/BSS will be considered as a strong asset.

Technical & Industry Know-How

• Understanding of business processes and large enterprise automation systems.
• Strong command of TM Forum concepts; hands-on TMF implementation experience is a major asset.
• Awareness of modern telecom network management trends (e.g., SDN/NFV, MEF models).
• Good knowledge of one or several residential and professional telecom services is an advantage.
• Familiarity with cloud-native principles (Azure), CI/CD pipelines, infrastructure as code, and security-by-design.

Soft Skills

• Strong analytical mindset with the ability to anticipate impacts of complex solutions.
• Creative, optimistic, solution-oriented, and comfortable navigating ambiguity.
• Fully customer-oriented, with excellent communication and natural collaboration habits.
• Highly motivated to learn and continuously develop.
• Strong facilitation and stakeholder alignment skills

Languages

• Good command of English (oral and written).
• Knowledge of one of Belgium's national languages is a strong additional asset.