Vacature

Senior Web Developer (Node.js & PHP)

We are Onyx. We are looking for talent.

Scale a Global Platform from our Hub in Hamme

The mission

Onyx One is a leading SaaS platform for supply chain risk management. We ensure safety and compliance for large industrial organizations worldwide. Recently acquired by a global powerhouse, we are now scaling from a local success story to the world’s #1 contractor management platform.

The best of both worlds

You get the resources of a global organization (250+ developers) with the agility and “small-team feel” of our Belgian office in Hamme.

The Tech Landscape

  • Backend: Node.js (Primary) & PHP (Legacy/Transition)
  • Frontend: React
  • Process & Data: MySQL, MongoDB, Camunda (Process Orchestration)
  • Infrastructure: AWS-hosted, Kubernetes (K8s)
  • AI & Tools: We embrace using AI for productivity (Claude Code)
  • Methodology: Scrum, TDD, DDD, and Mob Programming

Your role: collaborative engineering

We don’t believe in coding in silos. As a Senior Developer, you will be a driving force in our Mob Programming environment. You will solve complex architectural puzzles together with your peers, ensuring high code quality and instant knowledge sharing.

  • Global Scaling: Design systems capable of handling a massive, multi-tier international user base.
  • Hybrid Mastery: Navigate and improve our ecosystem across Node.js and PHP.
  • Quality Leadership: Apply TDD and DDD principles to build resilient, maintainable software.
  • AI in our product: Build features that leverage AI to enhance user experience and automate complex processes (such as scanning and validating uploaded documents)

What you bring

  • Senior Expertise: 4+ years of experience in Node.js. You’ve built and scaled production-grade systems.
  • Polyglot Mindset: A proven track record in PHP. You’re comfortable navigating existing codebases to move the platform forward.
  • Collaboration First: You thrive in a mobbing setup. You believe that the best code is written together.
  • Engineering Excellence: A “quality-first” mentality with experience in TDD and Domain Driven Design.
  • Learning: You’re eager to learn new programming languages and technologies such as using AI to boost productivity. 
  • Fluency: Strong communication skills in English.

The Offer

  • The Power of 250: Access to a massive international developer community while working in a small, autonomous team.
  • Continuous Growth: Our mobbing culture is a built-in learning machine. You will grow every single day.
  • Stability & Impact: The security of a global group with the impact of a scale-up.
  • Premium Package: Competitive salary, car or mobility budget, excellent fringe benefits, and a genuine work-life balance.
  • Modern Workspace: Join our close-knit Belgian team in Hamme (East Flanders).
  • Ready to build the world’s leading platform? The mob is waiting for you.

Send your resume and cover letter to Katrijn at katrijn@onyxone.com
Do you still have a question? Feel free to contact us at the number +32 9 269 80 21