Senior Data Scientist

JOIN OUR TEAM
As
Senior Data Scientist
, you will lead our efforts in incrementality testing and causal inference, helping to quantify the true impact of marketing activities across all channels. In this highly analytical and hands-on role, you will design and analyse experiments, guide marketing measurement strategy and play a key part in enabling smarter, evidence-based decision-making. This is a great opportunity for someone who combines statistical rigour with strong stakeholder communication and thrives in a fast-paced, data-driven environment. This position is
permanent
and based in
Warsaw
.

*WHAT YOU'LL DO*

• Design, enforce and execute incrementality experiments such as geo-experiments, holdout tests and lift studies to quantify marketing impact
• Develop models to estimate causal effects using methods including difference-in-differences, synthetic control and Bayesian inference
• Collaborate with marketing, data science and engineering teams to build scalable and reliable testing frameworks, exploring the integration of AI-based approaches to automate experiment design and analysis
• Analyse and communicate results to stakeholders, translating experimental findings into clear, actionable business insights
• Support the broader marketing measurement strategy, contributing to media mix modelling (MMM) and attribution when relevant
• Champion best practices in experimental design, causal modelling and data quality across the organisation

YOU COME WITH

• 4+ years of experience in marketing analytics, data science or experimentation
• Strong knowledge of causal inference and experimental design, including geo-experiments, DiD, synthetic control and Bayesian methods
• Proficiency in Python, with a solid understanding of marketing metrics and multi-channel measurement challenges
• Excellent communication skills, with the ability to convey uncertainty and statistical nuance to non-technical audiences
• A curious, hands-on and ownership-driven mindset, with a passion for designing experiments and validating hypotheses through real-world data
• A pragmatic, business-oriented approach that balances statistical rigour with commercial impact, combined with strong analytical thinking, attention to detail and a drive to help marketing teams make smarter, evidence-based decisions

WHY WESTWING
If you are looking for a place where ambition meets creativity, where ideas turn into impact fast, and where people are trusted to grow - you have found it.

At Westwing, we're building the Superbrand in Design with a team that's shaping the future of beautiful home & living.

Here is what you can look forward to:

• A high-performance culture built on trust, feedback and collaboration
• An inspiring, international environment that empowers you to think big, take ownership, and grow beyond your comfort zone
• A flexible hybrid setup with 2 office days per week - because strong connections and quick collaboration make great ideas happen
• Work-from-anywhere opportunities for up to 4 weeks per year - as fresh perspectives spark bold ideas
• 20 to 28 days of paid holiday to rest, recharge, and come back ready to create
• A beautiful, centrally located, dog-friendly office with inspiring spaces
• Exclusive discounts - 40% off Westwing Collection, 20% off third-party brands (each on non-reduced items), 10% Family & Friends discount, plus special-occasion vouchers
• Wellbeing support through mental health resources, sports memberships, and preventive care
• Team rituals that celebrate results and togetherness - from Summer to Winter Parties

*ABOUT US*
Westwing, Europe's #1 in Beautiful Living e-commerce, is present in 20+ European countries and achieved a GMV (Gross Merchandise Volume) of EUR 497 million in 2024. As Europe's premium one-stop destination for Design Lovers, it offers a unique brand experience with a carefully curated assortment of the Westwing Collection and 3rd party design brands. The integrated platform combines Shop, Daily Specials, Stores, the B2B Service (Westwing Business) and the Westwing Design Service. Westwing's team works together on its shared purpose to "Excite people to create homes that unlock the full beauty of life". Founded in 2011, Westwing is headquartered in Munich and went public on the Frankfurt Stock Exchange in October 2018.

Our team is a diverse group of professionals aiming for high performance, working together at a fast pace in an inspiring, international and informal environment that enables you to grow your career while working with a brand and products our customers love. We're made up of passionate people who are creative enough to disrupt the status quo, brave enough to fail and smart enough to win. So come, be part of the "wow, you work at Westwing?" crowd.

Diversity is deeply rooted in our culture. Our mission doesn't stop to inspire only your design choices, it continues to embrace an inclusive lifestyle filled with respect to everyone's uniqueness, cultural differences and equal opportunity.