Senior Software Engineer (Team Contract)

In this role you will design and build a new internal application to manage supplier contracts, replacing a legacy system. You’ll help shape the technical foundation and way of working for a new Contracting Team in Rotterdam, using a Microsoft-based stack. You will own delivery from design to production, collaborating with internal teams and external partners. This is a chance to influence architecture early and work on a modern, cloud-native solution that scales with Sunweb’s contracting needs.

• hybrid working
• office furniture and IT equipment provided
• 25 holidays + 6 ATV days
• travel discounts up to 20%
• coaching sessions for wellbeing
• Reflect & Develop Plan for career growth

• Design and develop a new contract management application
• Build cloud-native solutions with C#, .NET and Azure
• Create internal React UIs for users
• Replace legacy system with scalable modern platform
• Contribute to system design, architecture and data modeling
• Develop reliable SQL-based integrations and data handling
• Implement automated testing, CI/CD and DevOps practices
• Communicate progress, risks and dependencies clearly
• Take ownership from design through delivery and production
• Collaborate with contractors, suppliers and internal teams with accurate data
• Utilize GitHub Copilot and related tools to boost productivity

• ≥5 years of professional C# and .NET experience
• Experience building cloud-native apps on Azure
• Strong SQL and data modeling skills
• Solid system design experience
• Ability to apply clean-architecture pragmatically
• React experience for internal tools
• CI/CD, automated testing and DevOps practice experience
• Experience modernising or replacing legacy systems
• Clear communication and ability to surface risks and dependencies
• Ownership mindset from idea to delivery
• English communication; Dutch a plus

• strong communication
• ownership and accountability
• pragmatic focus balancing quality and delivery
• C#
• .NET
• Microsoft Azure