PAT Platform Developer - C

About Proximus NXT

Proximus NXT Luxembourg supports all organizations in their digital transformation, by providing holistic ICT & Telecommunication solutions, as well as tailored managed services. With our partners and customers, we co-create opportunities and enable growth in a secure and sustainable manner. As a result of our unique expertise in next-gen IT services, mobile and advanced connectivity, we help our customers achieve their ambitions and realize their vision.

Together with them and our partners we implement sovereign and trusted solutions that make people work smarter.– www.proximusnxt.lu

Your mission :

Our team manages approximately 40 tools supporting infrastructure lifecycle operations. The squad is currently delivering two strategic platforms — Cycloid (self-service infrastructure portal) and n8n (workflow orchestration engine) while maintaining and evolving a broader portfolio of legacy and modern tools.
We are looking for a Platform Developer to join the team and contribute to both platform delivery and the evolution of the tool portfolio.

As a Platform Developer in the PAT squad, you will:

• Develop and maintain components for the Cycloid and n8n platforms (APIs, integrations, automation scripts)
• Build CI/CD pipelines to support automated delivery of platform components
• Develop new solutions to replace or reinforce existing tools in the PAT portfolio
• Collaborate closely with Domain Architects, the Lead Developer, and the Lead Architect to deliver robust, maintainable solutions

Key Responsibilities

Platform Development (Cycloid & n8n)

• Develop and maintain the CJ API (Go/Python) that serves dynamic form data and handles request lifecycle
• Build and maintain n8n workflows and sub-workflows (transversal building blocks)
• Develop Cycloid Stack Forms (.forms.yml) and associated handlers (Python)
• Implement integrations between platforms (Cycloid ↔ GitLab, n8n ↔ CMS, n8n ↔ ServiceNow, n8n ↔ CMS)
• Write and maintain automated tests for platform components

CI/CD & Automation

• Design, build, and maintain CI/CD pipelines (GitLab CI, Concourse)
• Automate build, test, and deployment processes for platform components
• Manage container image builds and promotion across environments (Dev → Acceptance → Production)
• Implement GitOps practices for platform deployments (ArgoCD, Helm)

Tool Portfolio Evolution

• Analyse existing tools to identify replacement or improvement opportunities
• Develop new solutions (APIs, scripts, integrations) to replace legacy tools or extend platform capabilities
• Ensure backward compatibility during migration from legacy to new solutions
• Document all developed solutions (architecture, usage, operational procedures)

Collaboration & Quality

• Participate in code reviews and enforce coding standards
• Write clear technical documentation for developed components
• Support Domain Architects in developing their Cycloid stacks and n8n workflows
• Contribute to the definition of development best practices and reusable patterns

Your profile :

Technical Skills

Required

• Proficiency in Python (primary development language)
• Experience with Ansible (playbooks, roles, automation)
• Experience with CI/CD pipelines (GitLab CI, Jenkins, Concourse, or similar)
• Experience with Git (branching strategies, merge requests, GitOps)
• Experience with containers (Docker, Kubernetes/OpenShift)
• Experience with REST API design and development
• Familiarity with YAML/JSON configuration and schema validation
• Comfortable with Linux command line and shell scripting (Bash)

Nice to Have

• Experience with Helm charts and Kubernetes manifests
• Experience with n8n or similar workflow automation tools (Airflow, Temporal, AWX)
• Experience with PostgreSQL or other relational databases
• Familiarity with Terraform or other IaC tools
• Knowledge of OIDC/LDAP authentication and authorization
• Experience with observability tools (Prometheus, Grafana, Dynatrace)
• Experience working in a regulated or institutional environment

Soft Skills

• Adaptable - able to switch between products and technologies as the squad's missions evolve. Nothing is permanent; priorities shift based on project needs and the team must respond accordingly
• Reliable estimator - able to assess effort and time required for each assignment before committing delivery timelines to stakeholders•
• Transparent communicator - proactively flags potential delays and difficulties early, and regularly updates progress on development tasks
• Autonomous and proactive - able to pick up a problem and drive it to completion
• Team player- works well in a small squad, shares knowledge, asks for help when needed
• Clear communicator - can explain technical decisions to non-technical stakeholders
• Pragmatic - delivers working solutions, iterates, avoids over-engineering

Our offer:

• A professional, stimulating and innovative working environment:

Joining Proximus Luxembourg means becoming part of a human-sized company while benefiting from the strength, expertise and opportunities offered by the Proximus Group. You will work within dynamic, supportive and collaborative teams, where team spirit, knowledge sharing and innovation play a central role.

• Genuine career opportunities within the Proximus Group:

You will have the opportunity to develop your career within Proximus Luxembourg and the Proximus Group, both nationally and internationally. Thanks to the diversity of our activities, internal mobility opportunities and an environment that encourages continuous learning, you will be able to strengthen your skills and grow your expertise in innovative fields such as cloud, data, artificial intelligence, telecommunications and emerging technologies. You will benefit from personalized support and tailored training programs to support your professional development.

• An attractive remuneration package and benefits that support your work-life balance:

Your salary is defined according to a clear salary framework, taking into account your professional experience, skills and seniority. The recruiter will share the applicable salary range with you before the first interview. You will also benefit from flexible working hours with the possibility of teleworking, as well as numerous benefits: meal vouchers, the possibility of a company car, “quality time” dedicated to supporting your work-life balance (4 hours per month), additional days of leave linked to our collective agreement, sports and well-being activities, and much more.

• A company committed to diversity and inclusion:

Proximus Luxembourg promotes equal opportunities and provides an inclusive environment where everyone can thrive and develop their full potential. Our multicultural teams, representing 34 nationalities, reflect the richness of our company culture.

As part of the recruitment process, a criminal record extract may be requested. Your personal data is processed in accordance with applicable data protection regulations.