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Senior Java/Kotlin Developer

The Randstad

At Sytac, we build high-performing engineering teams for leading organizations. We combine a pragmatic, people-first culture with technical craftsmanship—giving engineers autonomy in real production environments.

For one of the largest transport organizations in the Netherlands, we are looking for a Senior Java/Kotlin Developer. You will join the team to build and scale a custom solution that manages the financial and logistical handling of door-to-door services like OV-fiets (bike sharing), P+R parking, and luggage lockers.

🛠 What you’ll do

  • Develop end-to-end: Engage in the full lifecycle from design and development to production maintenance.
  • Build for the future: Create modular, reusable building blocks for the KOSMOS application to accelerate service delivery.
  • Modernize the stack: Work within a complex IT environment using the latest technologies to make the platform future-proof for Mobility as a Service (MaaS).
  • Collaborate in Agile teams: Partner with developers, designers, and Product Owners in a DevOps-driven culture.
  • Ensure reliability: Share responsibility for platform lifecycle management and participate in a 24/7 on-call rotation (approx. once every 8 weeks).
  • Drive standards: Develop and document architectural guidelines to maintain high code quality.

✅ What we’re looking for

  • Senior Experience: At least 6 years of professional experience as a Developer with a HBO level of thinking.
  • Language Proficiency: Strong experience with Kotlin, Java, and Spring Boot.
  • Cloud & Containers: Hands-on experience with Docker/Kubernetes and cloud platforms (Azure is a plus).
  • API & Messaging: Expertise in REST APIs, Open API Specification (OAS/YAML), and messaging protocols like AMQP.
  • DevOps Mindset: Experience with Git, CI/CD, and a "hands-on" mentality.
  • Leadership: Ability to take the lead, coach the team, and drive a positive, result-oriented dynamic.
  • Languages: Excellent command of both Dutch and English.
  • NL residency (no sponsorship).

Tooling: Kotlin, Java, Spring Boot, Azure, Docker, Kubernetes, Git, AMQP, REST.

🌟 Nice to have

  • Azure DevOps: Experience with pipelines and CI/CD automation.
  • Security: Knowledge of OAuth 2.0, Microsoft AD, and secure connections (HTTPS/TLS).
  • IaC & Monitoring: Experience with Terraform, Prometheus, or Grafana.

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