Senior Software Engineer

Job description

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.

Start date: August 2026

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 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 direction and ways of working of the team

What we offer

For a Dutch contract (based in our Rotterdam office):

• Monthly gross salary between €6300 and €6700 plus 6 ATV days (based on full-time employment, excluding 8% holiday allowance). Please note: ATV days do not apply to part-time contracts.
• We enjoy the journey so enjoy 25 holidays based on fulltime employment.

For a Spanish contract (based in our Girona office):

• Yearly gross salary between €72.042,- and €76.618,- (based on full-time employment)
• We enjoy the journey so enjoy 23 holidays based on fulltime employment.

Additionally, we offer:

• Enjoy up to 20% off when booking with our brands for you, your family, and your friends.
• As an international company we support a hybrid way of working. We provide you with office furniture and IT equipment.
• A personalized Reflect & Develop Plan to support your career growth.
• Benefit from coaching sessions designed to support your well-being.
• Receive work-from-home and travel allowances to ease your daily routine.

About Sunweb Group

Sunweb Group is one of Europe’s largest online travel platforms, with over 1.3 million customers annually. We operate in 8 international markets with 600+ colleagues across Europe. We combine scale with a fast-moving, ownership-driven culture where teams are trusted to build and improve continuously.