Senior Data Scientist – Ad Fraud & Attribution Protecting our advertising ecosystem and improving attribution accuracy

How do you make our customers happy?

By ensuring advertisers reach real customers and understand the true value of their campaigns.

You will work at the intersection of fraud detection and attribution, analyzing large‑scale behavioral data, identifying sophisticated fraud patterns, and helping the organization interpret attribution data correctly. A key part of your work is explaining what the data can and cannot tell us, guiding product, PMs, and business partners toward decisions rooted in statistical rigor and sound reasoning. Your insights strengthen trust in our entire marketing & advertising ecosystem.

The biggest challenge

This role demands an unflinching commitment towards the realities of fraud detection and attribution modeling. You’ll face datasets that are messy, adversarial, and often riddled with bias—there are no shortcuts or easy answers. Every day brings new tactics from fraud actors and shifting market dynamics, requiring a commitment to transparency and rigorous analysis.

Complexity is the norm: distinguishing genuine customer behavior from noise or malicious signals is rarely straightforward. You’ll investigate bot activity, attack surfaces, and suspicious cohorts, and you’ll be expected to clearly articulate how attribution data should—and should not—be interpreted. Quantifying uncertainty, bias, and econometric effects is a central part of the job, as is validating hypotheses with statistical rigor and improving attribution logic using advanced modeling techniques.

Success in this role is rooted in analytical independence and a collaborative mindset. You’ll bridge gaps across teams, translating complex findings into actionable insights and fostering a culture of transparency and trust. Leadership here is demonstrated not by titles, but by the courage to confront complexity, communicate honestly, and drive principled decisions that shape our advertising ecosystem.

What you’ll do as Data Scientist

You provide the analytical depth and cross‑team influence needed to keep our platform safe and accurately measured. Fraud actors evolve rapidly, and attribution accuracy requires both mathematical skill and clear stakeholder guidance.

You will combine technical modeling with strong communication and organizational influence, helping teams understand how to interpret data, weigh model choices, and align around the right direction.

You shape both our fraud detection evolution and our attribution logic, not only through modeling but by driving the conversations that lead to the right strategic choices.

You’ll need to:

  • separate genuine customer behavior from malicious or noisy signals
  • investigate attack surfaces, bot behavior, and suspicious cohorts
  • quantify uncertainties, biases, and econometric effects
  • validate hypotheses using statistical reasoning
  • improve attribution logic using statistical, econometric, ML, or neural network techniques
  • guide PMs and business in understanding trade‑offs
  • choose between ML, econometric models, or neural networks — and articulate why

You’ll work closely with cross-functional teams including data science, product, engineering, and business stakeholders, acting as a key resource for fraud detection and attribution analytics.

Expect a blend of hands-on data analysis, model development, team meetings, and stakeholder presentations, with a focus on driving actionable insights and platform safety.

Why you can make a difference

You bring depth in statistics, econometrics, machine learning, and analytical investigation.
You are energized by:

  • exploring ambiguous or messy data,
  • reasoning economically about value, uncertainty, and incentives,
  • separating signal from noise,
  • guiding teams toward the right modeling choices,
  • and independently diving into large datasets to uncover actionable insights.

Your work directly influences platform trust, advertiser value measurement, and detection quality.

3 reasons why this is (not) for you

Switch to find out

  • - Uncertainty slows you down You prefer stable, predictable datasets and aren’t comfortable with analytical uncertainty or behavioral noise.
  • - Works best with structured questions You avoid collaborative, iterative investigation and would rather wait for someone else to define the problem fully.
  • - You work best in your silo You’re not interested in influencing or guiding cross-functional teams toward the best analytical choices.
  • + Ambiguity energizes you You get energy from solving ambiguous, high-stakes challenges and shaping analytical direction for others.
  • + You enjoy wrestling data (and usually win) You love diving deep into messy, adversarial data using tools like SQL, BigQuery, and ML frameworks to surface actionable insights.
  • + You’re a cross‑team player You communicate clearly and influence across teams—engineering, product, business—bringing people together to drive real results.

Where you’ll be working.

You’ll join the Reliable product group within Marketing & Advertising, working closely with Engineering, Product, Analytics and Business teams. The team serves as the primary ingestion point for interaction data in Marketing & Advertising, holding a business-critical role in ensuring transparency to our advertisers.

Overview of hard skills

To be successful in this role, you need:

  • Experience shaping analytical solutions and guiding organizational decision‑making
  • Strong skills in statistics and/or econometrics
  • Experience with ML (any framework) — anomaly detection, fraud detection, or adversarial modeling a plus
  • Familiarity with attribution modeling, causal inference, or bias‑correction techniques
  • Proficiency in SQL (BigQuery) and Python
  • Ability to explain data and modeling choices to non‑technical stakeholders
  • Strong communication and data visualization skills
  • Curiosity and passion for applied ML, adversarial thinking, and complex data challenges correction‑ techniques

We take pride in our B Corp certification and strive for continuous improvement every day. Our annual bonus is tied to sustainability goals, and we are committed to equality and equal opportunities for all.

Perks of having a blue heart

Bonus

The bonus is calculated at the end of the year and we always end the year with a fun party!

On and off

At bol we understand like no other that you have to take care of yourself first, then your environment and then bol. In that order. Therefore, everyone at bol receives 29 days of vacation.

The culture and the office

Our colleagues work hard to make the daily lives of our customers easier and more fun. But of course, we do this in an inspiring and creative environment!

Your application process

Any questions?

I'm Monika Myslinska, Recruiter at bol. Anything I can help you with regarding the Senior Data Scientist - Ad Fraud & Attribution vacancy?

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Monika Myslinska

Recruiter

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