At Sunweb Group, we're passionate about creating unforgettable holiday experiences. As a Junior Data Scientist, you’ll be part of a small but experienced team, working at the intersection of business impact and machine learning. You’ll develop and deploy operational Machine Learning models that directly support and optimize all areas of our business – from pricing and personalization to forecasting and marketing.

Our models don’t just stay in notebooks. At Sunweb, your code runs in production without manual interference – delivering real value in real time. You’ll work in a supportive and flexible environment with the freedom to take ownership of your projects, while having access to experienced colleagues when you need it. Your contributions will help thousands of travelers enjoy seamless, personalized holiday experiences powered by your models.

Location: Rotterdam (Hybrid – 50% in office)

Start Date: Mid September / Beginning of October 2026

Availability: Fulltime

Reports to: Head of Data Science

This position is well-suited for candidates who have recently completed their Master's degree or are at the beginning of their professional career in Data Science.

What You’ll Work On

As a Junior Data Scientist, you'll spend your time not only developing models and working with data, but also collaborating closely with stakeholders across the business. Success in this role requires curiosity, strong communication skills, and the ability to build relationships with colleagues from different departments. You'll work together with teams such as Pricing, Marketing, Product, and Commercial to understand business challenges and translate them into data-driven solutions.

In this versatile role, you’ll work hands-on with data, create and implement ML models, communicate your findings to stakeholders, and develop the tools and dashboards that bring your insights to life.

Expect To Make An Impact Across Diverse Domains, Including

Dynamic Pricing
Personalization
Demand Forecasting
Media Mix Modelling

Your Responsibilities

Design, test, and deploy scalable Machine Learning models.
Perform data analysis and build data pipelines.
Translate results into clear insights through dashboards and presentations.
Support your models in production – from functional queries to technical troubleshooting.
Explore new ideas and continuously improve existing solutions.

What skills will bring you to the top?

You recently completed a MSc degree in Data Science, Computer Science, Econometrics, Mathematics, Artificial Intelligence, or a related quantitative field at a Dutch university.
You are legally authorized to work in the Netherlands without sponsorship.
You are passionate about turning data into practical business solutions and are eager to see your models running in production.
You enjoy working with people just as much as working with data. You are a social, approachable, and proactive communicator who knows how to connect with stakeholders across different departments.
You are curious, analytical, and not afraid to ask questions to fully understand a business challenge.
You can translate complex findings into clear insights and recommendations for non-technical audiences.
You are comfortable balancing longer-term projects with ad-hoc business requests.
You have strong communication skills in English. Dutch language skills are preferred but not required.
Experience with Python, R, SQL, Power BI, Databricks, BigQuery and/or Microsoft Azure is a strong advantage.

Why join our journey?

Monthly gross salary between €3500 and €4000 plus 6 ATV days (based on full-time employment, excluding 8% holiday allowance). Please note: ATV days do not apply to part-time contracts.
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.
We enjoy the journey so enjoy 25 holidays based on fulltime employment.
Access to a personalized Reflect & Develop Plan to support your career growth.
Opportunities to grow into senior or specialist roles.
Benefit from coaching sessions designed to support your well-being.
Receive work-from-home and travel allowances to ease your daily routine.

Let us introduce Sunweb Group

Sunweb Group is one of Europe’s largest online travel companies, sending over 1.3 million travellers each year to unforgettable destinations. With offices in eight international markets and over 600 colleagues, we’re united by one mission: to create seamless, high-quality holiday experiences at competitive prices.

We operate leading brands like Sunweb and Eliza Was Here, powered by our custom-built travel tech. Our Fast Forward culture values focus, trust, and innovation — enabling you to grow your career while helping millions press pause and create lifelong memories.

Ready for departure?

Do you want to become part of our team as a Junior Data Scientist? Apply now and help us transform the future of travel through data.

Do you have any questions? Please feel free to reach out to Yvonne van Essen, our Talent Acquisition Specialist via jobs@sunwebgroup.com. We are looking forward to hearing from you!

Deadline applications: 31st of July

Please note that due to the summer holiday period, live interviews with the hiring manager will be scheduled from week 34 onwards. We appreciate your patience and look forward to reviewing your application.

Our Interview Process Includes The Following Steps

An initial conversation via video Teams with our Talent Acquisition Intern (week 32- 33)
A (technical) interview with our Head of Data Science live at our office in Rotterdam (week 34 - 35)
Meet your future colleagues and learn more about the team (week 35 - week 36)

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.

Sunweb Group

Vacatures

Junior Data Scientist