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Staff

The many faces of GESIS

Schüller, Sascha
Service Strategy & Engineering
Software Engineering
 Deputy team lead

+49 (0221) 47694-523
sascha•schueller[at]gesis•org
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Vita

In 2005, completed vocational training and obtained a technical diploma (Business Assistant for Business Informatics with a focus on Information Processing) in Bad Godesberg. 

From 2006 to 2007, underwent training as a computer science expert / software development at the Chamber of Commerce and Industry in Cologne (IHK).

In 2008 to 2010, bachelor's program in Biomathematics/Bioinformatics at RheinAhrCampus in Remagen. 

Since May 2011, employed at GESIS - Leibniz Institute for Social Sciences, working in the development and automation of information processes in the social sciences in Bonn/Cologne.

In 2013, began further training as an Operative Professional / Certified IT Systems Manager (IHK). Completed a project thesis from 2014 to 2015, connecting the social science portal Sowiport to the GESIS Single Sign-On infrastructure. The goal was to enable federated authentication for GESIS portal users using their employer accounts through the German Research Network's Authentication and Authorization Infrastructure (DFN-AAI). This was achieved through the integration of a Service Provider (SP) installation and prototype development for Sowiport.

Obtained the training qualification for instructors (AEVO) in 2015.

In 2016, completed the advanced training as a Certified IT Systems Manager (IHK).

In 2017, received special recognition as the best in the Fortbildungsqualifikation (professional development qualification) among the nearly 4,000 individuals who took their further education exams at IHK Cologne.

Service

Automation of Informational Processes:

2011 - 2016 as a Specialist in Application Development in the Department of Knowledge Technologies for the Social Sciences (KTS, formerly WTS).

  • Automated import procedures for data sets in Sowiport (Python, SolR)
  • Procedures for uninterrupted import of data into the document-based database of Sowiport (Bash)
  • Further development of search technology in Sowiport (VuFind, PHP)
  • Import, export procedures, and field-based search in SOFISwiki (SMW Extension SolrStore)
  • Support for authentication and authorization, Single Sign-On DFN-AAI, Shibboleth, Login und Homeles-User bei GESIS
  • Connect Sowiport to the Single Sign-On infrastructure of GESIS (PHP, JavaScript)

 

Development, Implementation and Operation of GESIS Systems:

2017 - 2023 as a Certified IT Systems Manager in the Department of Knowledge Technologies for the Social Sciences (KTS) Team Data & Service Engineering.

  • Error fixing and test-driven development of automated linking of publications and research data (InFoLiS)
  • Import procedures (PHP) for heterogeneous data sources (ElasticSearch) into the GESIS-wide search (GWS)
  • Setup and administration of the GESIS Single Sign-On infrastructure (Kubernetes, GESIS-Login)
  • Setup and implementation of the logging infrastructure for centralized evaluation of connected GESIS services and offers (Graylog)
  • Client-based user interaction logging mechanism (JavaScript) with connection to the GESIS logging infrastructure (GESIS-Logging)
  • Bug fixing of the fact-checking web page scraper tool and provision of sample extracts (ClaimsKG)
  • Conception and implementation of manual link verification for automatically generated linking of data sets (MaLiViTo)
  • Design update (CSS) according to GESIS style guide requirements (GWS, Missy, GESIS-Login, TheSoz)
  • Frontend development (JavaScript) with consideration of accessibility and responsiveness (GWS)
  • Conception and creation of guides and training materials (Techdocs)
  • Definition of GESIS-specific software maturity levels (Techdocs)

 

2017 – 2020 as a Trainer.

 

Since 2024 as a Certified IT Systems Manager in the Department of Service Strategy & Engineering (SSE), Team Software Engineering.

  • Agile software development in combination with active participation in DevOps culture
  • Continuous Integration, Delivery, and Deployment (CICD)
  • Integration of legacy projects with Docker and GitLab-CI
  • Development of rule-based and schedule-specific pipelines
  • Implementation of and Support for Review App functionality (Infrastructure as Code)
  • Management of Docker images and data releases using GitLab (NEXUS)


Administered Information Systems, Databases, and Projects (Overview, including End-of-Life)


Other Profiles:

Publications

Chapter in an edited book

Carevic, Zeljko, Sascha Schüller, Philipp Mayr, and Norbert Fuhr. 2018. "Contextualised browsing in a digital library’s living lab." In Proceedings of the 18th ACM/IEEE on Joint Conference on Digital Libraries, edited by Jiangping Chen, Marcos André Gonçalves, and Jeff M. Allen, 89-98. doi: https://doi.org/10.1145/3197026.3197054. https://arxiv.org/abs/1804.06426.

Data/Software

Gangopadhyay, Susmita, Katarina Boland, Sascha Schüller, Torodov Konstantin, Andon Tchechmedjiev, Benjamin Zapilko, Pavlos Fafalios, Hajira Jabeen, and Stefan Dietze. 2022. ClaimsKG - A Knowledge Graph of Fact-Checked Claims (August, 2022). GESIS - Leibniz-Institute for the Social Sciences. Data File Version 1.0.0. doi: https://doi.org/10.7802/2469.

Presentation at a conference

van Hoek, Wilko, Brigitte Mathiak, Philipp Mayr, and Sascha Schüller. 2011. "Comparing the accuracy of the semantic similarity provided by the Normalized Google Distance (NGD) and the Search Term Recommender (STR)." 10th European NKOS Workshop at TPDL 2011.