Ethosia

We’re Hiring: Senior Data Scientist / ML Researcher – Reinforcement Learning
Are you passionate about bridging the gap between cutting-edge research and real-world production? Do you want to shape the personalization experience for millions of players using state-of-the-art reinforcement learning?
We are looking for a
Senior Data Scientist / ML Researcher
to join our multidisciplinary personalization team!
Our team combines strong statistical fundamentals with SOTA algorithms to deliver real-time experiences. Over the last few years, we’ve built and scaled a real-time recommendation engine based on Bayesian multi-armed bandits (check out our public
pybandit
library!). Here, your research translates directly into production, serving diverse use cases across multiple studios.
🎯 What You’ll Do:
<ul>
<li>End-to-End Research:
Lead full-cycle, data-driven research—from problem definition, data collection, and validation to model development, evaluation, and deployment.</li>
<li>Real-World Impact:
Analyze, test, and demonstrate the direct impact of your models in a real-time production environment.</li>
<li>Cross-Functional Collaboration:
Partner closely with engineers, BI, and product teams to deploy and iterate quickly.</li>
<li>Thought Leadership:
Propose and contribute to scientific papers, tech blogs, and industry conferences.</li>
<li>Mentorship:
Act as a Data Science Subject Matter Expert (SME) within the organization, mentoring fellow DS and MLE colleagues.</li>
</ul>
🎓 What You’ll Bring:
<ul>
<li>Education:
M.Sc. or Ph.D. in Computer Science, Mathematics, Statistics, Engineering, or a related quantitative field.</li>
<li>Experience:
4+ years of hands-on industry experience.</li>
<li>Technical Depth:
Deep theoretical and practical knowledge of machine learning, paired with strong scientific reasoning to drive complex projects.</li>
<li>Coding &amp; Tools:
Proficiency in Python. Working experience with
PyMC
is a major plus.</li>
<li>Communication:
Excellent verbal and written communication skills—you can easily translate complex technical concepts for product managers and business stakeholders.</li>
<li>Mindset:
A true team player with a passion for collaborative problem-solving.</li>
</ul>
✨ Advantages (Nice to Have):
<ul>
<li>Strong background in Reinforcement Learning (specifically Multi-Armed Bandits).</li>
<li>Proficiency in SQL and experience with Git.</li>
<li>Experience in the gaming industry.</li>
</ul>

Senior Data Scientist / ML Researcher – Reinforcement Learning

Senior Data Scientist / ML Researcher – Reinforcement Learning

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