Senior Software Engineer: Cloud-Native Contracts App

Sunweb Group; Rotterdam; Hybrid; EUR 65,000 - 80,000; Full time

Benefits offered by this job

Hybrid work

Holiday allowance

Office equipment

Career development plan

Coaching

Home/travel allowances

Job summary

Sunweb Group in Rotterdam is seeking a Senior Software Engineer to help build a new internal contracting application, replacing the legacy system. You will join Team Dalyan initially, with growth into a dedicated Contracting Team, in a hybrid Rotterdam office.

Start date December 2026 and fulltime employment. You will design and implement cloud-native solutions using C#, .NET, and Azure, build user-friendly React interfaces for internal users, and model data with SQL.

Qualifications

• Five+ years of professional C#/.NET experience.
• Experience building cloud-native apps on Azure.
• Strong SQL and data-modelling skills.
• Clear communication and ownership mindset.

Responsibilities

• Design and build new contract app for suppliers.
• Develop cloud-native solutions using C#, .NET, and Azure.
• Build internal React applications.
• Replace legacy app with scalable modern solution.
• Contribute to system design and data modelling.
• Develop reliable integrations with SQL databases.
• Apply automated testing, CI/CD and DevOps practices.
• Communicate decisions, progress, risks and dependencies clearly.
• Take ownership from design to delivery and production.
• Collaborate with contractors, suppliers and internal teams.
• Use GitHub Copilot and other tools to boost productivity.

Skills

C#

.NET

Cloud architecture

SQL

React

English communication

Tools

Azure

GitHub Copilot

CI/CD

Job description

Sunweb Group in Rotterdam is seeking a Senior Software Engineer to help build a new internal contracting application, replacing the legacy system. You will join Team Dalyan initially, with growth into a dedicated Contracting Team, in a hybrid Rotterdam office.

Start date December 2026 and fulltime employment. You will design and implement cloud-native solutions using C#, .NET, and Azure, build user-friendly React interfaces for internal users, and model data with SQL.