Argyris Constantinides

CTO and co-founder,

Cognitive UX Ltd. &

Research Scientist,

Computer Science,

University of Cyprus

Education

PhD in Computer Science

University of Cyprus
2018 - 2022

MSc Web Science and Big Data Analytics

University College London
2014 - 2015

BSc Computer Science

University of Cyprus
2010 - 2014

Languages

  • Greek (Native)
  • English (Professional)

About

I am CTO and co-founder of Cognitive UX Ltd., and a Special Teaching Scientist at the Department of Computer Science, University of Cyprus.

I hold a PhD in Computer Science from the University of Cyprus (2018-2022), an M.Sc. in Web Science and Big Data Analytics from the University College London (2014-2015), and a B.Sc. in Computer Science from the University of Cyprus (2010-2014).

My research interests revolve around the area of Human-Computer Interaction, Usable Security, and Intelligent User Interfaces.

I have professional experience as a researcher and software engineer in EU research projects (Erasmus+ 2023 NARRATE, Erasmus+ 2021 CREAMS, Erasmus+ 2020 TRUSTID, H2020 SERUMS, EU-AAL MEMENTO) and National research projects (PersonaWeb, Smartag). In the past, I have worked as a software engineer at Playtech BGT Sports, London, UK (2015-2017).

Publications

ACM HEALTH 2023 - Constantinides, A., Belk, M., Fidas, C., Beumers, R., Vidal, D., Huang, W., Bowles, J., Webber, T., Silvina, A., & Pitsillides, A. (2023). Security and Usability of a Personalized User Authentication Paradigm: Insights from a Longitudinal Study with Three Healthcare Organizations. ACM Transactions on Computing for Healthcare. DOI: https://doi.org/10.1145/3564610
ICIMTH 2022 - Webber, T., Kuster Filipe Bowles, J., Constantinides, A., Belk, M., & Morley, E. (2022). Evaluating a smart healthcare system design through participatory approach. Advances in Informatics, Management and Technology in Healthcare. DOI: https://doi.org/10.3233/SHTI220725
Aging Clinical and Experimental Research 2022 - König, T., Pigliautile, M., Águila, O., Arambarri, J., Christophorou, C., Colombo, M., Constantinides, A., Curia, R., Dankl, K. Hanke, S., Mayer, C. C., Moritsch, S., Müllner-Rieder, M., Pernkopf, F., Schüler, C., Stillo, M., Mecocci, P., & Stögmann, E. (2022). User experience and acceptance of a device assisting persons with dementia in daily life: a multicenter field study. Aging clinical and experimental research, 34(4), pp.869-879. DOI: https://doi.org/10.1007/s40520-021-02013-8
IEEE/WIC/ACM WI-IAT 2021 - Constantinides, A., Constantinides, C., Belk, M., Fidas, C., & Pitsillides, A. (2021). Applying Benford's Law as an Efficient and Low-cost Solution for Verifying the Authenticity of Users’ Video Streams in Learning Management Systems. IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology (pp. 563-569). DOI: https://doi.org/10.1145/3486622.3493993
IJHCS 2021 - Constantinides, A., Fidas, C., Belk, M., Pietron, A., Han, T., & Pitsillides, A. (2021). From hot-spots towards experience-spots: Leveraging on users’ sociocultural experiences to enhance security in cued-recall graphical authentication. International Journal of Human-Computer Studies 149 (2021): 102602. DOI: https://doi.org/10.1016/j.ijhcs.2021.102602
UMAP 2020 - Constantinides, A., Pietron, A., Belk, M., Fidas, C., Han, T., & Pitsillides, A. (2020). A Cross-cultural Perspective for Personalizing Picture Passwords. In Proceedings of the 28th ACM Conference on User Modeling, Adaptation and Personalization (UMAP '20). ACM, New York, NY, USA, 43-52. DOI: https://doi.org/10.1145/3340631.3394859
IUI 2020 - Constantinides, A., Belk, M., Fidas, C., & Pitsillides, A. (2020). An eye gaze-driven metric for estimating the strength of graphical passwords based on image hotspots. In Proceedings of the 25th International Conference on Intelligent User Interfaces (IUI ’20). ACM, New York, NY, USA, 33–37. DOI: https://doi.org/10.1145/3377325.3377537
WI 2019 - Constantinides, A., Fidas, C., Belk, M., & Pitsillides, A. (2019). "I Recall this Picture": Understanding Picture Password Selections based on Users’ Sociocultural Experiences. In IEEE/WIC/ACM International Conference on Web Intelligence (WI '19), ACM, New York, NY, USA, 408-412. DOI: https://doi.org/10.1145/3350546.3352557
UMAP 2019 - Constantinides, A., Belk, M., Fidas, C., & Pitsillides, A. (2019). On the Accuracy of Eye Gaze-driven Classifiers for Predicting Image Content Familiarity in Graphical Passwords. In Proceedings of the 27th ACM Conference on User Modeling, Adaptation and Personalization (UMAP '19). ACM, New York, NY, USA, 201-205. DOI: https://doi.org/10.1145/3320435.3320474
MobileHCI 2018 - Constantinides, A., Belk, M., Fidas, C., & Samaras, G. (2018). On Sociocultural-centered Graphical Passwords: An Initial Framework. In Proceedings of the 20th International Conference on Human-Computer Interaction with Mobile Devices and Services Adjunct (MobileHCI '18). ACM, New York, NY, USA, 277-284. DOI: https://doi.org/10.1145/3236112.3236150
UMAP 2018 - Constantinides, A., Belk, M., Fidas, C., & Samaras, G. (2018). On Cultural- centered Graphical Passwords: Leveraging on Users’ Cultural Experiences for Improving Password Memorability. In Proceedings of the 26th Conference on User Modeling, Adaptation and Personalization (UMAP '18). ACM, New York, NY, USA, 245-249. DOI: https://doi.org/10.1145/3209219.3209254
MDM 2015 - Constantinides, A., Belk, M., Germanakos, P., & Samaras, G. (2015). The PersonaCheck System for Personalizing M-Commerce Checkout Processes. In Mobile Data Management (MDM), 2015 16th IEEE International Conference on (Vol. 1, pp. 303-306). IEEE. DOI: 10.1109/MDM.2015.58
UMAP 2015 - Germanakos, P., Belk, M., Constantinides, A., & Samaras, G. (2015). The PersonaWeb System: Personalizing E-Commerce Environments based on Human Factors. In UMAP Workshops.
INTERACT 2015 - Belk, M., Germanakos, P., Constantinides, A., & Samaras, G. (2015). A human cognitive processing perspective in designing E-commerce checkout processes. In Human-Computer Interaction (pp. 523-530). Springer, Cham. DOI: https://doi.org/10.1007/978-3-319-22701-6_38

Work Experience

Special Teaching Scientist

Jan 2024 - May 2024
Department of Computer Science, University of Cyprus, Nicosia, Cyprus
  • Introduction to Programming and Problem Solving

Special Teaching Scientist

Sep 2023 - Dec 2023
Department of Computer Science, University of Cyprus, Nicosia, Cyprus
  • Human Computer Interaction
  • Data Visualization

Special Teaching Scientist

Jan 2023 - May 2023
Department of Computer Science, University of Cyprus, Nicosia, Cyprus
  • Introduction to Programming and Problem Solving
  • Introduction to Programming for Electrical and Computer Engineers

Special Teaching Scientist

Sep 2022 - Dec 2022
Department of Computer Science, University of Cyprus, Nicosia, Cyprus
  • Computer Science and Information Systems
  • Data Structures and Algorithms for Electrical and Computer Engineers

CTO and co-founder

Sep 2019 - Present
Cognitive UX Ltd., Nicosia, Cyprus

Makes all executive decisions with regards to the technological interests of the company.

Responsible for outlining the company's technological vision, implementing technology strategies, and ensuring that the technological resources are aligned with the company's business needs.

Human-centered Computing Researcher

Jan 2018 - Present
University of Cyprus, Nicosia, Cyprus

My research interests revolve around the area of Human-Computer Interaction, Usable Security, Artificial Intelligence, and Intelligent User Interfaces.

Python Back-End Software Developer, SRE Team

Nov 2015 - Dec 2017
Playtech BGT Sports, London, UK

Involved in the development and maintenance of the common projects including communication and service libraries, development/integration tools and configuration/monitoring tools

Involved in the development and maintenance of the build/deployment/management of containerized applications as microservices and responsible for the stability of the Development Environments

Member of the Out Of Hour Support Team – 1st Line Support for issues reported on Production Environments

Research Lab Assistant

Jun 2014 - Aug 2014
SCRAT Group, University of Cyprus, Nicosia, Cyprus

Highly involved in the web development of a national-funded research programme (PersonaWeb), which is a framework for dynamic adaptation and personalization of general content eServices, based on cognitive and human factors

Summer Staff

Jun 2013 - Sep 2013
IT Department, Elysium Hotel, Paphos, Cyprus

Assist and support various Software Systems available in the Hotel

Highly involved in the development of the Hotel’s Website

Summer Staff

Jun 2011 - Aug 2011
IT Department, KPMG, Nicosia, Cyprus

Operating System installation (including imaging and remote installation)

Software installation and configuration

End User Support

IT asset inventory

Education

PhD in Computer Science

Jan 2018 - Apr 2022
University Of Cyprus, Nicosia, Cyprus

Dissertation: "Personalized Cued-recall Graphical User Authentication based on Image Content Familiarity"
My dissertation proposes a new retrospective-based and personalized image delivery approach for cued-recall Graphical User Authentication (GUA) schemes. The suggested approach is realized in a Web-based cued-recall GUA scheme, coined RetroPass, by leveraging on end-users' sociocultural experiences for the delivery of personalized images, which depict sceneries that reflect end-users' sociocultural activities, experiences and declarative memories on different levels of abstraction.

MSc Web Science and Big Data Analytics

Oct 2014 - Oct 2015
University College London, London, UK

A specialist programme that covers fundamental aspects of Web related technologies and big data analytics, ranging from information search and retrieval, data mining and analytics, large-scale distributed and cloud computing, to E-Commerce and their business economic models, and the latest concepts of Web 2.0 and the underlying network science.

Coursework: A challenging one-year programme covering 8 taught modules, including Information Retrieval and Data Mining, Distributed Systems and Security, Multimedia Systems, Complex Networks and Web, Web Economics.

Dissertation: "Relevance, Popularity, Credibility: A Novel URL Recommender System on the Social Web"
My dissertation is part of an online social website, coined Searcular, which combines Google search with social networks aiming to provide personalized recommendations for improving user search experience by looking at like-minded people. My contribution to the Searcular project revolves around the recommendation of relevant, popular and credible public URLs extracted from social networks.

BSc Computer Science

Sep 2010 - Jun 2014
University of Cyprus, Nicosia, Cyprus

A combination of theoretical and practical aspects of Computer Science, examined in terms of final year written exams as well as the application of practical tools to individual and team projects

Coursework: An intensive four year course covering 33 taught modules, including Communications and Networks (8.5/10), Logic In Computer Science (8.0/10), Networks Information Security (8.0/10), System Programming (8.5/10), Advanced Networks (8.0/10), Computer Architecture (8.0/10), Mobile Computing Systems – Android Development (9.5/10)

Dissertation: "Tool for Development and Processing of General Content eServices for Personalized and Adaptive System"
My dissertation is part of a national-funded research programme, coined PersonaWeb, aiming to supply a framework for dynamic adaptation and personalization of general content eServices, based on cognitive and human factors.