Platform Engineer (Developer Experience & Tooling)

Job Summary:

At Belfius, we are building the future of digital banking. Our team is dedicated to creating a next-generation technical ecosystem that is intuitive, secure, and highly efficient for our developers. We operate in a modern, agile environment, leveraging a tech stack centered around TypeScript/Node.js, React, and a cloud-native infrastructure powered by Azure and Azure DevOps.

The Role

We are looking for a highly skilled Platform Engineer with an expert-level background in Node.js and TypeScript to join our Platform Team. In this role, your "customers" are our internal developers. You won't just be running apps in the cloud; you will be building the tools, SDKs, and automation logic that make development at Belfius seamless. From managing our IDP to crafting custom CLIs and automated code migrations with ts-morph, you will be the architect of our Developer Experience.

Responsibilities

• Build & Scale Tooling: Design and maintain internal developer tools, including custom CLIs and metapackages, to standardize and accelerate the development lifecycle.
• Platform Orchestration: Own and evolve our Internal Developer Platform to provide developers with self-service capabilities.
• DevOps & CI/CD: Architect and optimize robust pipelines in Azure DevOps, ensuring smooth, automated deployments and high system reliability.
• Code Evolution: Leverage tools like ts-morph to perform large-scale code transformations and maintain high-quality standards across our repositories.
• Standards & Versioning: Implement and enforce Semantic Versioning (SemVer) and best practices for package management to ensure stability across our ecosystem.
• Monitoring & Observability: Run applications in the cloud with a focus on proactive monitoring, ensuring our platform services are resilient and performant.
• Mentorship: Act as a technical bridge, helping product teams leverage platform tools effectively and gathering feedback to continuously improve our stack.

What We're Looking For

Required Qualifications

• Educational Background: Bachelor's or Master's degree in Computer Science or a related engineering field. Strong problem-solving skills and ability to work independently and collaboratively.
• Experience: Proven experience of minimum 5 years as DevOps or fullstack web developer.
• Node.js Expertise: Deep, expert-level experience in building backend services and tooling using Node.js and TypeScript. Experience with relational databases (PostgreSQL, MSSQL).
• Frontend Literacy: Strong understanding of React and modern build tools like Vite. Track record of building Single Page Applications.
• Cloud & DevOps: Proven experience running applications in Azure and managing automation within Azure DevOps. Strong expertise with Kubernetes, such as CRDs.
• Process Driven: Experience with automated testing, code reviews, and Agile methodologies.
• Communication: Excellent written and verbal communication skills.
• Language Skills: Proficiency in English is mandatory, combined with fluency in either French or Dutch.

Nice-to-Haves

• Experience: Experience in the banking, financial services, or FinTech sector. Experience in big companies.
• Automation Enthusiast: Experience with Renovate for automated dependency management.
• Developer Portals: Hands-on experience with Backstage or similar IDP frameworks.
• Codemods: Experience using ts-morph or similar AST-based tools for automated refactoring.
• CLI Development: You have a passion for building intuitive Command Line Interfaces that developers love to use.
• Mindset: You are pragmatic, hands-on, and possess a "growth mindset"—always looking for ways to automate the mundane.