Senior Software Engineer — Booking & Search Systems

Sunweb Group; Rotterdam; Hybrid; EUR 65,000 - 80,000; Full time

Benefits offered by this job

Holiday allowance

Hybrid work model

Brand booking discount 20%

Office furniture provided

Reflect & Develop Plan

Coaching sessions

Work-from-home and travel allowances

Job summary

Sunweb Group in Rotterdam is seeking a Senior Software Engineer to own the Booking and Search domain, shaping how customers find and book holidays. You’ll influence architecture, scale systems and mentor teammates in a small, autonomous Agile team.

You’ll work Hybrid from the Rotterdam office with start December 2026, bringing 5+ years of C#/.NET experience, Azure cloud deployments and a passion for clean architecture and pragmatic engineering. The role offers growth and international impact.

Qualifications

• 5+ years of experience with C# and .NET.
• Experience building cloud-native applications on Azure.
• Strong knowledge of SQL and data modelling.
• Solid understanding of system design and clean architecture.
• Experience with CI/CD, automated testing and DevOps practices.
• Experience with legacy systems and modernisation.
• Ownership mindset and drive to improve systems and processes.
• Strong stakeholder communication skills in English (Dutch is a big plus).
• Experience mentoring others and shaping the technical vision and direction of a team.
• Experience with Kubernetes is a big plus.

Responsibilities

• Define the team's technical vision and architectural direction.
• Own the Booking and Search domain and improve usability and performance for both customers and internal users.
• Work hands-on with the team on backlog items and complex technical challenges.
• Review designs and facilitate important technical decisions.
• Guide the maintenance and improvement of critical external applications and supporting tools, including updates pushed by our software vendor.
• Improve monitoring and alerting to enable fast response, and find structural fixes or mitigations.
• Work towards decoupling our systems from external applications by implementing an anti-corruption layer and creating a stable domain that shields our internal systems.
• Collaborate with business users, other engineering teams and software vendors on changes, issues and dependencies.
• Translate product needs into practical technical solutions and help break down complex work.
• Improve engineering quality through code reviews, documentation, pairing and knowledge sharing.
• Mentor engineers and help them grow their technical skills and ownership.
• Communicate technical risks, trade-offs and dependencies clearly.

Skills

C#

.NET

System design

Architecture thinking

English communication

Mentoring

Ownership mindset

Tools

Azure

Kubernetes

CI/CD

Job description

Sunweb Group in Rotterdam is seeking a Senior Software Engineer to own the Booking and Search domain, shaping how customers find and book holidays. You’ll influence architecture, scale systems and mentor teammates in a small, autonomous Agile team.

You’ll work Hybrid from the Rotterdam office with start December 2026, bringing 5+ years of C#/.NET experience, Azure cloud deployments and a passion for clean architecture and pragmatic engineering. The role offers growth and international impact.