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

Why this role is interesting
You have real influence on architecture and technical decisions
A pragmatic engineering culture focused on impact
International product with real scale and complexity
Opportunity to own and shape the technical dire

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