Dimitris Pantazatos

About

I work at the point where technology, operations and the business have to agree on something. That usually means owning a solution end to end: the architecture, the ML pipelines, the cloud integration, and the release readiness that turns a promising model into a system somebody depends on at 9am on a Monday.

I lead hands-on. I set the standards for quality, security and MLOps, review the code, and mentor engineers across software, data and DevOps — including people who do not report to me. I came to this from economics and informatics rather than from pure engineering, which is probably why I care as much about what a system costs and who has to use it as about how it is built.

Based in Athens. Greek native, English at C2.

Experience

AI & Data Solutions Manager

Hellenic Telecommunications Organization · Athens

March 2025 – present

Own the end-to-end technical design and delivery of scalable AI and data solutions, from architecture and ML pipelines through cloud integration to production readiness.
Take autonomous technical decisions on solution architecture, technology stack, ML approaches and Azure services.
Define and enforce standards for MLOps, monitoring, validation, security and release readiness.
Act as hands-on technical lead for software, data and DevOps engineers, influencing technical standards beyond direct reporting lines.

Selected work. Co-designed and productionised DoRe, an AI-driven document recognition and invoice processing system now supporting core procurement and finance operations. Designed and led the implementation of agentic AI solutions across business analysis, HR, procurement workflows and RFP management. Established the validation rules, error handling, alerting and human-in-the-loop controls that cut manual processing effort and error rates.

AI & Data Solutions Architect

100Mentors · Athens

July 2022 – March 2025

Designed and implemented the AI and data solutions behind the company's core products.
Led data strategy to keep quality, security and consistency intact across the analytics and BI layers.
Evaluated emerging AI, ML and data technologies and introduced the ones that earned their place in the product.
Technical lead for a team of data analysts and software engineers: mentoring, code review, direction.

Research Associate

Network Management & Optimal Design Laboratory · Athens

October 2016 – October 2026

Worked on multiple EU-funded projects (Horizon 2020, Horizon Europe, Erasmus+) spanning AI/ML, data analysis and digital infrastructure.
Contributed to work packages on learning analytics, digital material analysis, networked platforms and AI-enabled services.
Designed and maintained laboratory web platforms and infrastructure, including security and system administration.
Supported undergraduate and postgraduate teaching in intelligent networks, stochastic processes and optimisation in machine learning.

E-Learning Specialist

HYGIEIA Scientific Research & Educational Cluster · Athens

May 2019 – January 2022

Designed, developed and administered e-learning platforms and blended learning courses.
Analysed learning data to improve course effectiveness and engagement.

Earlier career

2009 – 2021

IT programming tutor — IEK ALFA & IEK Korelko, 2015–2021
Web developer & digital marketing assistant — Korelko Group, 2015–2016
Non-profit programme coordinator — NCDP Greece, 2014–2015
Customer support representative — ICAP Group, 2009–2014

Projects

Selected EU-funded projects and the role I held on each.

Education & certifications

MBA

Athens University of Economics and Business

2025 – present

MSc Big Data Analytics

University of Derby

2022 – 2023

MSc Informatics

University of Piraeus

2013 – 2016

Thesis: an introduction to game theory and its applications in economics and negotiations.

BA Economics

University of Piraeus

2008 – 2013

Certifications

Skills

Building

Running

Leading

Languages

Publications

Peer-reviewed work from the research years, mostly on learning analytics and, latterly, on interpreting ML classifiers.

2023

N. Kostopoulos, D. Kalogeras, D. Pantazatos, M. Grammatikou, V. Maglaris. SHAP interpretations of tree and neural network DNS classifiers for analyzing DGA family characteristics. IEEE Access. 10.1109/ACCESS.2023.3286313

2022

I. Bakaniene, M. Dominiak-Świgoń, M. A. Meneses da Silva Santos, D. Pantazatos, M. Grammatikou, M. Montanari, I. Virgili, G. Galeoto, P. Flocco, L. Bernabei, A. Prasauskiene. Challenges of online learning for children with special educational needs and disabilities during the COVID-19 pandemic: a scoping review. Journal of Intellectual & Developmental Disability, 48(2), 105–116. 10.3109/13668250.2022.2096956

2021

D. Pantazatos, M. Grammatikou, M. Montanari, S. Lariccia, G. Cibulskis, V. Maglaris. Examining the impact of a Next Generation Digital Learning Environment in high school students before and during COVID-19. INTED 2021.

M. Grammatikou, M. Montanari, D. Pantazatos, I. Barth, A. Third, S. Lariccia, V. Maglaris. Progressing from the emergency to the optimum in online learning. INTED 2021.

M. Montanari, M. A. Santos, A. Third, C. Pellegrini, A. Prasauskiene, S. Lariccia, M. Grammatikou, D. Pantazatos. Digital learning for students with disabilities in primary school. INTED 2021.

2020

M. Montanari, I. Barth, S. Lariccia, D. Pantazatos, F. Martinez De Carnero, N. Sansone, G. Toffoli. Using learning analytics in a Next Generation Digital Learning Environment to transition from face-to-face to remote learning. ICERI 2020.

M. Grammatikou, N. Sansone, D. Pantazatos, D. Cesareni, V. Maglaris. The design and redesign of an online socio-constructivist course on engineering management. Book chapter in Cases on Engineering Management Education in Practice, IGI Global.

I. Otero, D. Pantazatos, M. Grammatikou, D. Docampo. Learning analytics in a Next Generation Digital Learning Environment: lessons from secondary education teachers. EDULEARN 2020.

I. Otero, D. Pantazatos, M. Grammatikou, D. Docampo. Open Educational Resources awareness in secondary education. EDULEARN 2020.

D. Pantazatos, M. Grammatikou, I. Barth, S. Lariccia, V. Maglaris. Continuous professional development for secondary education teachers to adopt NGDLE platforms. IEEE EDUCON 2020.

I. Barth, J. Barokas, M. Grammatikou, D. Pantazatos, A. Urbaityte, S. Riskiene. Open Educational Resources for bridging high school – university gaps in academic English studies. INTED 2020.

2019

I. Otero, D. Pantazatos, D. Docampo. First steps of creating an immersive scenario for improving naval skills. ICERI 2019, Seville.

M. Grammatikou, D. Pantazatos, I. Barth, A. Corleto, N. Sansone, M. Zimniewicz. Pilot results: usage and lessons learnt within the first pilots in Europe. EDULEARN 2019, Palma de Mallorca.

I. Otero, D. Pantazatos, D. Docampo. Good practices adopting copyright for creating and reusing OER. INTED 2019, Valencia.

2018

I. Hatzakis, M. Grammatikou, A. Castro, P. Szegedi, D. Pantazatos. UP2U: bridging the gap between schools and universities through informal education. EDULEARN 2018, Palma de Mallorca.

D. Pantazatos, C. Marinos, K. Giotis, A. Vekris, M. Grammatikou, V. Maglaris. SelCont: synchronized e-learning content toolkit. INTED 2018, Valencia.

Interests

I spend as much time outdoors as the job allows — photography, dancing and sport take most of it. Forced indoors, I read, watch films and play video games, which is roughly how this page came about.

Game theory

My MSc thesis was an introduction to game theory and its applications in economics and negotiations. The prisoner's dilemma is the standard opening example: two players, one move each, and a payoff structure where the rational individual choice leaves both worse off than cooperation would.