Senior System Architect — Cloud, AI & Security Lead

Proximus Group; Brussel Hoofdstad; On-site; EUR 90,000 - 140,000; Full time

Job summary

Proximus Group is seeking a senior, autonomous System Architect to shape the NIT technology landscape. You will govern the technical roadmap across front-end and back-end stacks (.NET, Java, Angular, Camunda) and ensure secure, scalable, future-proof software while guiding multiple squads.

In this strategic role you will drive architectural best practices, support sprints with refactoring, promote CI/CD and DevOps excellence, and stay ahead of emerging tech such as agentic AI and cloud-native

Qualifications

• Seniority and autonomy in Security, Cloud, AI, or Software Engineering.
• Strong background in Java/.NET, microservices, APIs, and distributed systems.
• Solid understanding of CI/CD, GitHub workflows, cloud platforms, monitoring & observability.
• Ability to influence, guide, and collaborate with multiple squads.
• Excellent communication, coaching, and mentoring abilities.
• Moc kito/WireMock (test mocking)
• Nice to have: STRUTS, JSF/JSP
• Agentic AI: Claude CoWork, Codex
• SpringBoot, SpringCloud
• UML
• Oracle (incl. ExaCC) + PostGreSQL
• SQL & PL/SQL
• JDBC, Hibernate/JPA
• IntelliJ IDE
• JUnit, SONAR
• Tomcat/Websphere/JBOSS

Responsibilities

• As System Architect, govern & manage the technical roadmap for front-end and back-end technologies used across NIT (.NET, Java, Angular, Camunda…).
• Define architectural best practices & integration guidelines, ensuring secure, maintainable, and robust solutions.
• Support squads hands-on, including joining sprints to tackle refactoring, rework, or complex technical challenges.
• Drive consistency in tooling & engineering processes (CI/CD, GitHub workflows, Dynatrace, OpenShift/Azure, change & release management…).
• Act as a bridge between squads and Centres of Excellence (DevOps, Cloud, Security, Observability).
• Stay ahead of emerging technologies (agentic AI, cloud‑native evolutions, NIS2/PQC security standards…) and proactively bring innovation into NIT.

Skills

Senior autonomy

Java/.NET

Microservices

APIs & distributed systems

CI/CD & GitHub workflows

Cloud platforms (OpenShift/Azure)

Monitoring/Observability

Coaching & mentoring

Agentic AI awareness

Tools

OpenShift

Azure

Dynatrace

GitHub workflows

JUnit

JDBC

Job description

Proximus Group is seeking a senior, autonomous System Architect to shape the NIT technology landscape. You will govern the technical roadmap across front-end and back-end stacks (.NET, Java, Angular, Camunda) and ensure secure, scalable, future-proof software while guiding multiple squads.

In this strategic role you will drive architectural best practices, support sprints with refactoring, promote CI/CD and DevOps excellence, and stay ahead of emerging tech such as agentic AI and cloud-native