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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer - **Company:** Sunweb Group - **Location:** Oña, Spain - **Contract:** Permanent contract - **Skills:** .NET Framework, Multitier Architecture, Agile Methodology, Automation of Tests, Microsoft Azure, C Sharp (Programming Language), Software Quality, Continuous Integration, DevOps, Github, Microsoft Visual Studio, Standard Sql, SQL Databases, Application Enhancement Tool, Spring Cloud, GitHub Copilot, ReactJS, Technical Debt, Build Management, Legacy Systems - **Published:** September 8, 2026 - **Apply:** https://www.buscojobs.com.es/senior-software-engineer-en-ona-ID-369401625 ## About the Role 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? ## 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.Location: Rotterdam / Girona Sunweb Group office (Hybrid) Start date: October - November **** 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 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 €**** and €**** 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 €******,- and €******,- (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.Ready for departure?Do you want to become part of our team as Senior Software Engineer?Click on "Apply".Do you have any questions?Please feel free to reach out to our Talent Acquisition team via.We are looking forward to hearing from you!Here's what you can expect during our selection process: Initial conversation (via video) with our Talent Acquisition Specialist First interview (via video/ live) with the Team Lead and Head of Tech Second interview (via video/ live) with the Team Lead and a team member Sunweb Group is an equal opportunity employer, which means we do not discriminate in any way.We celebrate diversity and are committed to creating an inclusive and safe environment for all employees.#LI-Hybrid #LI-YV1 ## Related Videos - [Watch Tests Go Brrrr! 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