Platform Architect

About Proximus Luxembourg

Proximus Luxembourg is a leading historical player in the ICT & Telecoms markets. Proximus Luxembourg addresses both residential and business markets through its commercial brands Tango, Proximus NXT and more recently Codit.

With PSF support status, the company has almost 750 employees. All these experts share a passion for digital technology, a spirit of openness and innovation, and a desire to simplify, connect and make their customers' personal and professional activities ever more secure.

Proximus Luxembourg is actively contributing to the acceleration of Luxembourg's digitalisation and its economic influence through the development of connectivity, resilient infrastructures and 5G, as well as innovative technologies such as Blockchain, Artificial Intelligence, Machine Learning and IoT.

Proximus Luxembourg is a subsidiary of the Proximus group (Euronext Brussels: PROX), provider of digital services and communication solutions operating in the Belgian and international markets.

Your mission :

•    Own the architecture of production-grade Kubernetes platforms — managed and on-premises/bare-metal — spanning multi-environment and multi-cluster topologies, networking, storage, and the security baseline.
•    Define reference architectures, platform standards, and upgrade/lifecycle strategy that engineering teams implement and operate.
•    Architect advanced cluster networking, including the CNI (Cilium), ingress and load balancing, and BGP-based routing and peering for on-premises and bare-metal environments.
•    Set the infrastructure-as-code and GitOps operating model — Terraform/OpenTofu module strategy, Argo CD or Flux, and Helm/Kustomize standards — so platform state is declarative, auditable, and reusable.
•    Define observability, resilience, and scaling strategy — monitoring, backup and disaster recovery, autoscaling, and capacity planning.
•    Own the security architecture: RBAC, Pod Security Standards, network policies, secrets management, image and policy guardrails, and governance.
•    Lead client advisory, workshops, and training, acting as the senior technical authority and trusted advisor in engagements.
•    Provide architectural escalation and design guidance to Platform Engineers on the platforms and infrastructure delivered.
•    Shape our AI-infrastructure direction — model serving, GPU scheduling, and ML platform patterns on Kubernetes.
•    Mentor engineers and grow platform capability, bringing relevant cloud-native practices back to the team.

Your profile :

•    Deep Kubernetes expertise — cluster architecture, workloads, scheduling, RBAC, networking (CNI, with hands-on Cilium experience), and storage (CSI) — at a design and architecture level.
•    Proven platform-architecture track record — designing production Kubernetes platforms and reference architectures across managed and on-premises/bare-metal, with at least one production distribution such as OpenShift or Rancher (RKE2).
•    Advanced networking — TCP/IP, DNS, routing, firewalls, load balancing, Kubernetes ingress, and BGP-based routing and peering for on-premises and bare-metal.
•    Infrastructure as code & GitOps mastery — Terraform/OpenTofu, Helm or Kustomize, CI/CD pipelines, and GitOps (Argo CD or Flux).
•    Security architecture & governance — designing RBAC, Pod Security Standards, network policies, secrets management, and policy guardrails.
•    Consulting & leadership — leading workshops, advisory, and stakeholder management, and mentoring engineers.
•    Documentation — excellent writing skills across formats (architecture documents, slides, emails, etc.).
•    Languages — fluency in English is required; French is a strong plus.

Our offer :

A professional and stimulating work environment in the IT & telecom sector. Multiple career opportunities within the Proximus Group at national and international level, cutting-edge training in new technologies, a wealth of recognized expertise. We also offer an attractive salary package and many other benefits.

Our company is an equal opportunity employer, valuing diversity in all its forms. We firmly believe that each individual brings a unique richness to our teams, and we are committed to creating an inclusive environment where every voice counts.

If at the end of the process your application is successful, you will be asked to provide an extract from your criminal record. Your personal information will be handled in compliance with applicable data protection laws.