# Senior Data Scientist (f/m/d) at adjoe

> The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday. This is one job from the board.

> Responsibilities: - Design and refine relevance models to im

- **Company:** adjoe (https://jobs.trythestack.co/companies/adjoe)
- **Location:** Hamburg, Germany
- **Work arrangement:** Remote
- **Employment type:** Full-time
- **Experience level:** 5–10 years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** Machine Learning, Python, SQL, Real-time Bidding, Recommender Systems, Neural Networks, Bayesian Methods, Reinforcement Learning, A/B Testing, Kubernetes, AWS, Airflow, MLFlow, Trino, Meta-Learning, Data Science
- **Posted by employer:** 2026-05-29
- **Added to The Stack:** 2026-06-05
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://jobs.ashbyhq.com/adjoe/16bf350d-3cd2-4dc2-98cb-cb6d589bae30 (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/senior-data-scientist-fmd-adjoe

## About the role

Responsibilities:
- Design and refine relevance models to improve targeting, engagement and revenue.
- Develop and optimize bidding policies using Bayesian methods, reinforcement learning and other optimisation techniques.
- Build meta-learning frameworks and personalization models that adapt from user interactions.
- Lead rigorous A/B testing and experimentation to validate model changes and measure KPI impact.
- Harden successful experiments into scalable production solutions using the company ML stack (Python, Kubernetes, Airflow, MLFlow, Trino).
- Collaborate with engineers and product teams to ensure models are production-ready and maintainable.
- Share knowledge, participate in architecture discussions and mentor junior team members.

Requirements:
- 4+ years professional experience in data science within AdTech, mobile gaming, e‑commerce or similar.
- Proven track record architecting and deploying large-scale recommender systems and neural-network models.
- Strong Python and SQL skills and familiarity with ML deployment tooling (Kubernetes, Airflow, MLFlow, Trino) preferred.
- Experience with A/B testing, experiment design and statistical analysis.
- Good engineering mindset: reproducibility, monitoring, and scalable data pipelines.
- Ability to translate research ideas into production-grade solutions and work closely with cross-functional teams.

## Responsibilities

Architect and refine relevance models and bidding policies to optimize ad performance and user engagement. Take end-to-end ownership of models within a modern ML stack, bridging the gap between experimentation and scalable production.

## Requirements

Requires 4+ years of professional data science experience in AdTech, mobile gaming, or e-commerce. Must be proficient in Python, SQL, and the deployment of large-scale recommender systems and neural networks.

## FAQ

- **Is this Senior Data Scientist (f/m/d) role still open?** It was posted on 2026-05-29. Listings more than 30 days old may no longer be active, so check adjoe's site before applying.
- **Does adjoe offer visa sponsorship?** This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on adjoe's site.
- **Where is this role located?** The listing gives the location as Hamburg, Germany. It is marked remote.
- **What skills does this role ask for?** The listing names: Machine Learning, Python, SQL, Real-time Bidding, Recommender Systems, Neural Networks, Bayesian Methods, Reinforcement Learning, A/B Testing, Kubernetes, AWS, Airflow, MLFlow, Trino, Meta-Learning, Data Science.

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## Notes for agents

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