OverviewAt 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.LocationRotterdam / Girona Sunweb Group office (Hybrid)Start dateAugust 2026AvailabilityFulltimeWhat You’ll DoDesign and build scalable, cloud-native applications on AzureOwn technical decisions and contribute to architectureImprove and modernize existing (legacy) systemsDrive engineering practices like CI/CD, testing, and clean architectureIdentify and reduce technical debtCollaborate with product and stakeholders to deliver real impactMentor engineers and contribute to team growthHelp define team standards and technical directionOur tech stackC#, .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 Bring5+ years of experience with C# and .NETExperience building cloud-native applications on AzureStrong knowledge of SQL and data modelingSolid understanding of system design and clean architectureExperience with CI/CD, automated testing, and DevOps practicesExperience with legacy systems and modernizationAbility to balance speed and quality pragmaticallyOwnership mindset and drive to improve systems and processesStrong stakeholder communication skillsExperience mentoring others and influencing technical directionWhy this role is interestingYou have real influence on architecture and technical decisionsA pragmatic engineering culture focused on impactInternational product with real scale and complexityOpportunity to own and shape the technical direction and ways of working of the teamWhat We OfferFor 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 contr

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