YUGENOX·JOBS

Senior Data Scientist – Graph Machine Learning

XM Careers · Athens

hybridfull-timeData & AnalyticsData Science and Business Intelligence

About the role

The Role:

We are looking for a Senior Data Scientist specializing in Graph AI to join our growing Data Science team. In this role, you will design and deploy production-grade graph machine learning solutions, working with Graph Neural Networks (GNNs), graph databases, and large-scale datasets to solve complex real-world problems.

You will play a key role in shaping the company's Graph AI capabilities, collaborating with cross-functional teams and mentoring other data scientists while delivering innovative, business-impacting solutions.

The main responsibilities of the position include: • Design, develop, and deploy Graph Neural Networks (GNNs) and graph-based machine learning solutions • Transform large, complex datasets into graph representations and extract actionable insights using advanced analytics, graph algorithms, and statistical techniques. • Drive the adoption of Graph AI across the organisation by identifying new use cases and contributing to the evolution of the company's data science strategy. • Communicate complex technical concepts and model outcomes clearly to both technical and business audiences. • Ensure high standards in data preparation, feature engineering, model evaluation, documentation, and code quality. • Leverage technologies such as Python, Graph Neural Networks, graph databases, modern ML frameworks, and cloud-based data platforms to build innovative data solutions • Ensure adherence to best practices in data quality, model monitoring, version control, and reproducible analytics • Lead and supervise a team of data scientists working on graph-related tasks • Partner closely with Data Engineers, Software Engineers, Product Managers, and business stakeholders to translate business challenges into scalable Graph AI solutions.

Main requirements: • University degree in Mathematics, Physics, Computer Science, Engineering, Data Science, or a related quantitative field • At least 6 years of experience in data science, machine learning and AI, including hands-on experience in designing, training and optimising Graph Neural Networks (GNNs) for production applications. • Experience working with relational and non-relational databases • Solid experience working with graph databases (e.g., Neo4j, Neptune) and proficiency in graph query languages (e.g., Cypher or Gremlin). • Experience with data visualization tools such as Matplotlib, Seaborn, or Plotly • Strong programming skills in Python and experience with Pandas, NumPy, and similar data analysis libraries • Strong analytical thinking, problem-solving ability, and attention to detail. • Excellent communication skills and the ability to work collaboratively in a team environment • Fluent in English

Benefit from: • Attractive remuneration package plus performance related reward • Private health insurance • Corporate pension fund • Intellectually stimulating work environment • Continuous personal development and international training opportunities

The Hiring Experience: What Awaits You • Let’s Connect – Intro Chat with Talent Acquisition • Deep Dive – First Interview with Your Future Team • Bring It to Life – Role-Specific Take-Home Task • Final Connection – Final Interview

All applications will be treated with strict confidentiality!

By submitting this application, I confirm that I have read and agree to the terms of the Privacy and Data Protection Notice and the Confidentiality Undertaking.

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Posted
Jul 28, 2026 (3 months ago)
First seen by us
Nov 7, 2026
Still listed
Nov 12, 2026
Source
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