At Sunweb Group, we’re building and evolving the core systems behind millions of holidays each year. As a Senior Software Engineer, you contribute directly to how our platform is designed, scaled, and improved.

You’ll work in a small, autonomous Agile team where ownership, pragmatism, and quality go hand in hand. This role goes beyond coding — you influence architecture, improve engineering practices, and help the department grow.

Location: Rotterdam / Girona Sunweb Group office (Hybrid)

Start date: October - November 2026

Availability: Fulltime

What You’ll Do

Design and build scalable, cloud-native applications on Azure
Own technical decisions and contribute to architecture
Improve and modernize existing (legacy) systems
Drive engineering practices like CI/CD, testing, and clean architecture
Identify and reduce technical debt
Collaborate with product and stakeholders to deliver real impact
Mentor engineers and contribute to team growth
Help define team standards and technical direction

Our tech stack

C#, .NET, Azure, SQL, React, GitHub, GitHub Copilot,



Visual Studio / VS Code

We actively leverage AI-powered tools such as GitHub Copilot to improve productivity and code quality.

What You Bring

5+ years of experience with C# and .NET
Experience building cloud-native applications on Azure
Strong knowledge of SQL and data modeling
Solid understanding of system design and clean architecture
Experience with CI/CD, automated testing, and DevOps practices
Experience with legacy systems and modernization
Ability to balance speed and quality pragmatically
Ownership mindset and drive to improve systems and processes
Strong stakeholder communication skills
Experience mentoring others and influencing technical direction

Not ticking every box? At Sunweb Group, we believe curiosity, energy, and the right mindset matter more than meeting every single requirement. If this role excites you, we’d love to hear your story — let’s explore the journey together.

Why this role

📌 Senior Software Engineer (España)
🏢 Sunweb Group
📍 España