A small piece of paper with numbers that have the power to change a life forever! Okay... let's replace the paper with an app and one person with 600,000+ monthly users. This is our business!

📌 Your Mission

As our Senior Data Scientist (m/f/d) you will build our understanding of marketing effectiveness: how we measure channel performance, predict valuable users, and turn insights into better decisions on budget, targeting, and personalization.

✅ Your Tasks & Responsibilities

• Build predictive models for marketing and user growth use cases, such as LTV, churn risk, propensity to convert, or user segmentation

• Support the design and analysis of experiments, holdouts, and A/B tests to understand whether marketing and product actions are creating real impact

• Help improve how we measure marketing effectiveness, starting with practical approaches such as channel analysis, attribution, and incrementality tests, and evolving toward more advanced methods over time

• Translate model outputs into clear, decision-ready recommendations on budget allocation, channel mix, and audience targeting, with honest trade-offs and uncertainty communicated plainly.
  Partner closely with Marketing, UX, Product, and Data colleagues to identify high-impact opportunities and turn ambiguous questions into useful decisions.
  

🎯 Your Goals in This Role

• Within 1 month: Deliver a first working marketing measurement diagnostic or prototype recommendation, such as an attribution readout, channel performance analysis, or budget allocation framework, with documented assumptions and next validation steps.

• Within 3 to 4 months: Have at least one predictive model (LTV, churn, or propensity) running on a regular cadence, validated via experimentation and influencing a real marketing decision.

• Within 6 months: Operate a repeatable measurement and modelling pipeline, regularly refreshed, monitored, and used by the marketing team to guide budget and targeting decisions.
  

🚀 Your Key Competencies

Must-have

• Strong applied statistics and machine learning, especially regression, classification, forecasting, experimentation, and uncertainty estimation in business contexts.

• Solid experimentation skills: designing tests, choosing the right metrics, and interpreting results without overfitting to noise.

• Strong data skills: SQL and Python, feature engineering, working with large datasets in cloud warehouses (e.g. BigQuery).

• Ability to work end-to-end: from ambiguous business questions to validated model to clear recommendation.

• Clear communication: you can explain model outputs, uncertainty, and trade-offs to non-technical stakeholders.

Nice-to-have

• Experience with Marketing Mix Modelling or Bayesian methods.

• Experience with paid digital channels, CRM, lifecycle, retention marketing, or consumer subscription/app businesses.

• High ownership: ships, measures, iterates—doesn’t stop at “analysis done”.

• Strong stakeholder communication: explains trade-offs, uncertainty, and rollout risks clearly.

• Pragmatic prioritization under ambiguity; focuses on highest ROI levers first.

• Calm, structured execution (production-quality over “clever hacks”).

• Collaborative mindset with Engineering/Data/Marketing/Finance.

🏆 Your Impact in This Role

• You contribute to making budget and channel decisions grounded in evidence, not intuition.

• You partner across the team to acquiring and retaining users more efficiently by targeting the right people with the right message.

• You support faster learning cycles by helping design strong experiments, interpret results accurately, and build on insights over time.

• You contribute to building a measurement foundation that scales beyond marketing into other parts of the business.

🎓 Your Background – Education & Experience

• Degree in Statistics, Mathematics, Computer Science, Econometrics, or a related quantitative field, or equivalent demonstrated skill.

• 4+ years of experience in Data Science or Applied ML

🎁 What we offer you:

Remuneration & work-life balance:

• Competitive salary and trust-based working hours.

• Private health insurance.

• Generous training budget.

• Extraordinary team events.

• Meal benefit.

Communication & trust:

• Open, honest and direct communication. Your ideas are welcome!

• A feedback meeting every quarter to help us grow together.

• We encourage innovation and are open to new ideas that push the boundaries.

Modern working:

• Everything you need for your daily work: MacBook, monitor, headphones and more.

Individual training:

• One training day per month and a generous training budget for your personal development.

Buddy program:

• An experienced team member will support you from day one to help you get started.

The team

• We are a colorful bunch from different nations and backgrounds. We don't distinguish by religion, gender, age, marital status... For us, the focus is on what you can do!

🪴Our values:‍

MAKE IT HAPPEN 💪🏼

• Drive results - Own the problem, the goal, and the outcome through self-organization and decisions backed by data

• Speak up with courage - Challenge ideas and raise issues directly when it matters

• Getting things done - Be pragmatic, keep momentum, and bring the energy

• Deliver quality impact - Ship solutions that move our mission and strategic goals forward

WIN TOGETHER 💚

• Communicate openly and respectfully - Be transparent, assume positive intent, and set aside own ego when interacting with others

• Help others win - Proactively share knowledge, time, and strengths in an interdisciplinary set-up

• Work across cultures - Learn from others’ perspectives and actively refine own style for trust-based collaboration in a diverse team

• Bring team spirit - Create moments of joy and belonging that fuel big outcomes together

SHAPE THE FUTURE  🚀

• Experiment to learn - Run tests, measure outcomes, treat mistakes as an invitation to learn and adapt insights into action

• Spot opportunities - Stay close to customers and market trends to identify what’s next

• Build user-first innovation - Deliver trustworthy, data-driven solutions and services that set the bar

• Grow yourself - Challenge and reflect on the way you work, seek feedback, and keep developing your skills
  
  
  👉 Sound like you?  📩 https://nextlottogmbh.teamtailor.com/