Senior Data Scientist (m/f/x)

Atolls is the world's largest community-driven shopping platform, active in 20+ markets. We help millions make smarter spending decisions across discovery, evaluation, and (re-)purchase by connecting people with the right brands and retailers. Our 1,000+ team across 10 countries builds products used every day at global scale, where you'll have real ownership and see your impact. Want to shape the destinations people rely on to shop with confidence? Keep reading. About This Role: We are looking for a Data Scientist to join our Community Data Team . At Atolls, you will be part of a growing applied ML capability — working on real problems that have a direct impact on how millions of users discover and interact with deals every day. You will build and iterate models that go into production — from predicting churn to understanding what makes a deal resonate with a community. We have rich behavioral data, a strong domain, and a clear belief that applied ML is one of the key ways we stay ahead. Beyond model building, you will also dig into complex statistical analyses and define the metrics that help us truly understand our users. At Atolls, your role will be instrumental in helping us lead our community intelligence and data integrity efforts. As a key part of our team, you will be directly involved in shaping the intelligence behind the digital destinations our users rely on throughout their shopping journeys. Your work will help us understand our community better, build smarter products, and make sure millions of consumers can make good, fair, and rewarding choices. Our Benefits: At Atolls, we believe in nurturing both your professional and personal growth. Here's what you can expect: A culture that values personal and professional development, with internal mobility opportunities. A supportive and open-minded team that embraces diverse perspectives and innovative ideas. 32 days of paid vacation plus your birthday off, giving you the time you need to recharge. A flexible hybrid working scheme to balance work and life. Access to a learning budget and internal training to help you grow in your role. Mental health coaching to support your well-being. Regular global and local get-togethers to celebrate successes and build connections. The possibility of taking a sabbatical after three years with the company. A cloud-based company setup, providing flexibility and collaboration opportunities no matter where you are. *These are global benefits that apply to all employees, with additional local perks based on your location. Responsibilities: In this role, you will: Data Science & Modeling: Build and iterate ML models - Churn Prediction, Sentiment Analysis, Member Segmentation, and more — using Python (Pandas, NumPy, Scikit-learn, XGBoost). You will learn and grow through collaboration and code reviews, with the goal of taking independent ownership of models over time. Deep-Dive Community Analytics: Analyze complex member behaviors - retention cohorts, engagement velocity, and viral loops — to uncover insights that drive community growth. Problem Translation: Take fuzzy, real-world business questions - like "what makes a deal good?" - engage with domain experts, and turn them into something measurable and actionable. High-Performance SQL: Master our ClickHouse environment, writing optimized queries that leverage columnar storage to process billions of rows of interaction data. Your Profile: We're looking for someone with experience in writing complex SQL, investigating web/app event data, and building predictive models in Python, who is dedicated to creating exceptional user experiences and driving innovation. We hire for aptitude and drive above depth of experience. If you have the right foundation and the right mindset, we want to hear from you. What we care about most: Problem translation : You can take something vague like "what makes a deal good?", talk to the right people, and figure out what to actually measure. For us, this matters most. Intellectual honesty : You don't trust your own results just because they look good. You check anyway. This is something we won't compromise on. Drive and curiosity : You want to get it right. You dig in, try things, and hold yourself to a high standard, not because someone asks you to, but because that's just how you work. What you need to bring: Solid Python skills and familiarity with core data science libraries (Pandas, NumPy, Scikit-learn) — you can actually build, not just describe Sound understanding of ML and statistics fundamentals — core models, train/validation/test splits, overfitting — enough to learn fast under guidance Solid SQL skills — comfortable with CTEs, window functions, and writing efficient queries At least one self-built, end-to-end project on a messy or open-ended problem — where you had to figure out what "good" meant yourself, not follow a tutorial. Also valued: Signals of applied curiosity — Kaggle, open-source contributions, personal projects or research in recommendation systems or LLMs Community Domain Knowledge: Experience analyzing developer communities, forums, or social platforms Our hiring process : TA Call : Meet one of our Talent Experts and get to know Atolls better. Technical Round : Focus on the technical aspects of the role (Through a Live Case) , and meet your potential manager. Final Round : Meet other Atollians 🏝️ It varies from 1 to 3 interviews *Some processes might slightly change according to needs Ready to apply? Be part of a destination where your work helps millions of people make better decisions every day. One focused application is all we need. If you truly fit more than one role, you're welcome to apply to up to three. This helps us match you with the right opportunity faster. We review every application with equal care and will reach out if your profile aligns. Apply now with your CV in English. *Portfolios, writing samples, or certifications may be requested based on the role. #LI-PM1 #LI-Hybrid At Atolls, we want to ensure that all employees can thrive in an inclusive environment. Our employment opportunities are open to every gender, race, religion, age, sexual orientation, ability, place of origin, or socioeconomic status. We remain committed to a culture of diversity, equity and belonging, where all employees are welcomed, respected, connected, and engaged. Find Jobs in Germany on Arbeitnow