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AI Engineer with 6+ years turning business needs into working LLM and GenAI systems, owning the full lifecycle from problem framing and research to robust, production-ready implementation. Specialized in multi-agent pipelines, agentic tool use, RAG, and fine-tuned models. Currently leading AI R&D for cybersecurity applications at Sphynx Technology Solutions, including Swiss and European research initiatives, with measurable impact such as 70% faster analytics pipelines and ~50% fewer customer-reported errors.…AI Engineer with 6+ years turning business needs into working LLM and GenAI systems, owning the full lifecycle from problem framing and research to robust, production-ready implementation. Specialized in multi-agent pipelines, agentic tool use, RAG, and fine-tuned models. Currently leading AI R&D for cybersecurity applications at Sphynx Technology Solutions, including Swiss and European research initiatives, with measurable impact such as 70% faster analytics pipelines and ~50% fewer customer-reported errors.

Dimitris Eleftheriou

Data Scientist, AI Engineer, Project Manager, +4

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AI Engineer with 6+ years turning business needs into working LLM and GenAI systems, owning the full lifecycle from problem framing and research to robust, production-ready implementation. Specialized in multi-agent pipelines, agentic tool use, RAG, and fine-tuned models. Currently leading AI R&D for cybersecurity applications at Sphynx Technology Solutions, including Swiss and European research initiatives, with measurable impact such as 70% faster analytics pipelines and ~50% fewer customer-reported errors.…AI Engineer with 6+ years turning business needs into working LLM and GenAI systems, owning the full lifecycle from problem framing and research to robust, production-ready implementation. Specialized in multi-agent pipelines, agentic tool use, RAG, and fine-tuned models. Currently leading AI R&D for cybersecurity applications at Sphynx Technology Solutions, including Swiss and European research initiatives, with measurable impact such as 70% faster analytics pipelines and ~50% fewer customer-reported errors.

Available to hire

AI Engineer with 6+ years turning business needs into working LLM and GenAI systems, owning the full lifecycle from problem framing and research to robust, production-ready implementation. Specialized in multi-agent pipelines, agentic tool use, RAG, and fine-tuned models.

Currently leading AI R&D for cybersecurity applications at Sphynx Technology Solutions, including Swiss and European research initiatives, with measurable impact such as 70% faster analytics pipelines and ~50% fewer customer-reported errors.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Greek, Modern

Fluent

English

Fluent

German

Beginner

Work Experience

Lead AI Engineer at Sphynx Technology Solutions AG

September 1, 2024 - Present

Led end-to-end development of multi-agent LLM/LMM systems for cybersecurity use cases, including CTI extraction and STIX automation, agentic hardware asset identification from images, and an AI Vulnerability Analyzer. Engineered service architecture using FastAPI for ingestion and asynchronous orchestration with Celery and RabbitMQ, persisted outputs via distributed tasks, and packaged deployments with Docker Compose. Built custom training datasets via automated crawling and fine-tuned open-weight models with designed evaluation metrics to improve extraction quality. Currently leading SOC automation and LLM-generated cyber range initiatives, and coordinating Swiss/European research collaborations.

Lead AI Engineer – Project Manager at Sphynx Technology Solutions AG

September 1, 2024 - Present

Led the R&D of a multi-agent pipeline leveraging LLMs and LMMs for advanced Cyberthreat Intelligence (CTI) extraction from unstructured data using Python, LangChain and Ollama. Developed CTI datasets from official and dark web reports using Python, Selenium, and BeautifulSoup. Fine-Tuned LLMs to optimize their performance in extracting CTI objects from text using PyTorch, Transformers and Unsloth. Developed LLMs and LLMs multiagent architectures using LangChain and LangGraph. Developed new evaluation metrics of ML models in CTI identification using Python. Directly assisted Cyber security Analysts by identifying new vulnerabilities in real time. Project management in Swiss/ European research projects related to AI in Cyber Security.

Data Science Instructor at Big Blue Data Academy

August 1, 2024 - September 6, 2025

Teaching compelling educational content relating to Data Science field such as Python, Statistics, Artificial Intelligence and Machine Learning.

Data Scientist at Circana

August 1, 2024 - September 6, 2025

Engineered a novel methodology in estimating accurate marketing campaign effectiveness using Python and MLlib. Resulting in 20% increase in accuracy of results and 50% decrease in computational time. Development of LLM enhanced chatbot using RAG for results demonstrations/explanations to customers. Integrated with Circana’s SQL Database for direct access of campaign results using Python and LangChain. Optimized ETL pipelines using PySpark, resulting in 50% decrease of computational time. Re-developed KPIs for measuring marketing campaign effectiveness using PySpark. Resulted in higher customer satisfaction and 70% percent decrease in computational time.

Data Science Instructor (part-time) at Big Blue Data Academy

September 1, 2023 - August 31, 2024

Taught Python, statistics, machine learning, and AI to 100+ professionals and students alongside full-time employment.

Data Scientist at Circana

October 1, 2021 - August 31, 2024

Prototyped and helped deliver an LLM-powered conversational RAG analytics product integrated with a company SQL database for natural-language campaign analytics. Engineered campaign attribution and KPI methodology using MLlib to increase accuracy by 20% while cutting computation time by half. Modernized large-data ETL/ML workflows in PySpark (preprocessing, feature extraction, outlier detection, training), reducing end-to-end processing time by ~50% and cutting KPI computation time by 70%, also reducing customer-reported KPI errors by ~50%.

Data Analytics Consultant at European Dynamics

October 1, 2021 - September 6, 2025

R&D of AI models -utilizing BERT encoders - for extracting skills acquired from unstructured educational programs curriculums and skills needed from unstructured job descriptions using PyTorch and Transformers. Achieving >90% accuracy. Project management of European Commission’s project (AI4EDUCAT).

Statistician (Internship) at Linked Business

August 1, 2020 - September 6, 2025

R&D in Market Segmentation analysis using Python. Utilized BERT encoders to analyze unstructured text descriptions of Greek companies' business codes. Developed Survival Analysis models of Greek enterprises utilizing their economic data using R.

Data Scientist at European Dynamics

March 1, 2020 - October 31, 2021

Built BERT-based multi-label classification models mapping European education programs to occupations for the European Commission (AI4EDUCAT), achieving 93% accuracy in extracting skills from unstructured curricula and job descriptions. Supported project management and stakeholder alignment across internal and external teams.

Education

MSc in Artificial Intelligence and Deep Learning at University of West Attica

March 1, 2023 - May 1, 2024

MSc in Statistics at Athens University of Economics and Business

October 1, 2018 - March 1, 2020

BSc in Mathematics at National and Kapodistrian University of Athens

October 1, 2011 - June 1, 2017

MSc, Artificial Intelligence & Deep Learning at University of West Attica

January 1, 2023 - January 1, 2024

MSc, Statistics at Athens University of Economics and Business

January 1, 2018 - January 1, 2020

BSc, Mathematics at National and Kapodistrian University of Athens

January 1, 2011 - January 1, 2017