John P. Caffier

Developing and operating digital products (apprat.io, WebViewGold, Textwash Pro, photos2webgallery, kalAIDoCreate, neooutput & more) used by more than 15,000 customers – from individuals to organisations across the private, public, and non-profit sectors – and over 45 million end users. Certified to ISO 27001 and ISO 9001.

Web and mobile app development using Objective-C (later Swift), Java, PHP, and other technologies (later React Native and Flutter for hybrid mobile apps); early web projects such as Mathe-VollLogo and BreisgauStraussen.

• Supervised by Prof. Dr. Bennett Kleinberg (Behavioural Data Science) and Prof. Dr. Olga Stavrova (Social Psychology & Micro-Sociology)
• Helping to supervise Bachelor’s thesis projects in Data Science at the Department of Mathematics and Computer Science, Eindhoven University of Technology
• Presented research at the NLPSI (Copenhagen) and ODISSEI (Utrecht) conferences
• Reviewer for journals such as Legal and Criminological Psychology and NLPPercep

• Research group of Prof. Dr. Ralph Hertwig (Adaptive Rationality)
• Supervised by Dr. Philipp Lorenz-Spreen (Computational Social Science)

• Research Assistant at the Experimental Psychology & Internet Science research group, e.g., in the DFG project e-SNARC: Replicability of Fundamental Results on Spatial-Numerical Associations in Highly Powered Online Experiments (08/2019 – 03/2022)
• Teaching Assistant at the General and Biological Psychology research group of Prof. Dr. Harald Schupp (10/2018 – 03/2019)
• Offering Exam Crash Courses on behalf of the Student Council (2022 & 2021)
• Speaker at the Ideas & Cheers event (12/2021)
• Participant at the 4th Summer School on Internet-based Data Collection and Analysis (09/2021)
• Takeover of the @unikonstanz Instagram channel on behalf of the Communications and Marketing department (05/2018)
• Won the Kilometer1 Idea Cup 2019 with a side project (07/2019)

• Big Data thesis project in cooperation with Jodel (06/2017 – 09/2017)
• Research Assistant at the Clinical Psychology and Psychotherapy research group of Prof. Dr. Jennifer Svaldi (10/2014 – 08/2017)
• Research Assistant at the Media Innovation and Media Change research group of Prof. Dr. Klaus Sachs-Hombach (10/2015 – 09/2017)
• Teaching Assistant at the Empirical Media Research research group of Prof. Dr. Guido Zurstiege (10/2016 – 03/2017)
• Deputy Member of the Student Union (10/2016 – 09/2017)
• Host & Producer of Visionen und O-Saft, the first podcast at the Institute of Media Studies, together with Dr. Kiron Patka (03/2016 – 10/2016); format continued by subsequent student cohorts since then; Guest in the 5-year anniversary episode (08/2021)
• Editor at the student journal Kupferblau (04/2015 – 09/2015)
• Later, offering Alumni Workshops to current students (e.g., 11/2022 & 11/2023)

• AI, Web & Social Media (2025)
• Philosophy: Justice (2024)
• Social Learning in Complex Systems (2023)
• Psychotherapy in the Digital Age (2022)
• Internet-Based Data Collection and Analysis (2021)
• Data Science: Machine Learning (2020)

• Member of the Special Interest Group “Future of Work”