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XM

Athens

Senior Data Scientist – Graph Machine Learning.

FULL TIMESENIOR LEVELDATA & ML

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 Policy and the Confidentiality Undertaking.
Pay
Not stated
Where
Athens · Limassol · Nicosia
Work
Not stated
Type
Full time
Posted
28 Jul, 2026
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