System Architect

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

A job at Proximus? You’ll find that everything revolves around the idea ‘Think Possible’. This means: we always assume that something is possible, even if it seems impossible. Well, especially so, actually. Call it a way of thinking that involves being open to a world of digital solutions that make our lives easier. And our way of working smarter.

A job at Proximus? You’ll find that everything revolves around the idea ‘Think Possible’. This means: we always assume that something is possible, even if it seems impossible. Well, especially so, actually. Call it a way of thinking that involves being open to a world of digital solutions that make our lives easier. And our way of working smarter.

About the Role

We’re looking for a senior, autonomous System Architect with deep expertise in at least one specialized domain (Security, Cloud, AI, Software Engineering…) and the curiosity to grow into new domains on the job. In this strategic role, you will help shape and evolve NIT’s technological landscape and ensure that our squads deliver high‑quality, future‑proof software.

As a System Architect, you will:

• 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.

You’ll be a key enabler ensuring teams deliver high‑quality software efficiently, consistently, and with long‑term vision.

Govern & Manage the NIT Technology Roadmap

• Steer the evolution of NIT’s technology stack (.NET, Java, Angular, CI/CD tooling, observability, cloud components…).
• Ensure architectural alignment and cross‑squad coherence.
• Provide domain leadership in Security, Cloud, AI, or Software Engineering.
• Guide modernization and technology‑adoption initiatives.
• Help squads align with NIT’s technical strategy.
• Join sprints to support complex implementation or refactoring.
• Promote scalable, maintainable, and high‑quality engineering practices.

Drive Tooling, DevOps & Process Excellence

• Enhance and harmonize tooling across squads:
• Release, change, incident & problem management
• Collaborate closely with DevOps, Cloud, Security & Observability CoEs.
• Advocate for automation, consistency, and operational excellence.

Lead Innovation & Technology Watch

• Track market and tech trends and evaluate new tools/frameworks.
• Drive PoCs, experiments, and pilot programs.
• Explore opportunities in agentic AI, cloud‑native evolution, and next‑gen security frameworks.
• Foster curiosity, experimentation, and continuous learning.

Your Profile

• 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.
• Mockito/WireMock (test mocking)
• Nice to have: STRUTS, JSF/JSP
• Agentic AI: Claude CoWork (Antrophic), Codex (OpenAI)
• SpringBoot, SpringCloud
• UML
• Oracle (incl. ExaCC) + PostGreSQL
• SQL & PL/SQL
• JDBC, Hibernate/JPA
• IntelliJ IDE
• JUnit, SONAR
• Tomcat/Websphere/JBOSS

Agile Ways of Working

• Scrum, XP, Pair‑Programming

Industry Experience (Nice to Have)

• Telecom industry experience
• Knowledge of TMF (TM Forum) standards
• Shape technology direction across all NIT squads.
• Influence engineering standards, tooling & architectural strategy.
• Work in a collaborative, high‑expertise environment with true autonomy & ownership.
• Join a culture that values quality, innovation & continuous improvement.

This job description is correct and surely not a hallucination

What do we offer you?

• We are 100% Belgian. So we make decisions in three languages. And all at the same time if you like!
• We are open to everyone: M, W, X, and in fact all the other letters of the alphabet.
• We encourage personal growth. At the Proximus Academy, you won't even want to miss a session.
• We are, of course, committed to sustainability. What else did you think?
• We firmly believe that working together is important, but that having fun together is even more so. That is why we regularly organise fun activities. (Please let us know if you have a talent for playing Santa Claus!)
• We believe in responsibility. Also in yours. For example, you can take it to launch your own initiatives.
• We put our customers first. And because we are all customers somewhere, you already know what that means. That’s good.
• And the ever-important work-life balance? We keep it in the right place.

Naturally we have a competitive salary package for you.