Christos Karatsalos
Athens
Overview
9
9
years of professional experience
19
19
years of post-secondary education
Work History
Director of Data Architecture & Data Assurance
OPTASIA (CHANNEL VAS)
1 2022 - Current
- Leading, coaching and mentoring team of twelve people in total, which consists of DataOps Engineering team (REST APIs), Visual Analytics team (Dashboards, performance, Data Monitoring) and Data Quality Assurance Engineering team (pre-processing, automation, data analytics, data cleaning)
- Build the Data Architecture & Data Assurance team since the beginning
- Operate in more than 40 deployments
- Organize and schedule everyday tasks using Kanban
- Define KPIs regarding monitoring of Data Quality
- Specifications regarding data visualization applications and automation regarding Data cleaning and Data Quality sanity checks
- Design appropriate data schema in order to persist data through data processing pipelines
- Design pipelines for Data Ingestion
- Design, implement and test in Java, REST API (Spring Boot) regarding Real Time Credit Scoring (Default Prediction) and Real Time Credit Limit Assignment.
Data Architecture & Data Assurance Manager
OPTASIA (CHANNEL VAS)
06.2021 - 01.2022
- Leading, coaching, and mentoring a group seven people in total (direct reports), which consists of Data Solution Architecture team, Visual Analytics team, and Data Assurance Engineering team
- Organize everyday tasks
- Hands-on performing data analysis using Pyspark and SQL (Apache Drill) on top of Hadoop file system
- Specifications regarding data visualization applications and automation tasks regarding Data cleaning and Data Quality sanity checks
- Design appropriate data schema in order to persist data through data processing pipelines
- Design pipelines for Data Ingestion
- Design, implement and test in Java a REST API (using Spring Boot) regarding Real Time Credit Scoring and Real Time Credit Limit Assignment.
Lead Data Architect
OPTASIA (CHANNEL VAS)
02.2019 - 06.2021
- Leading, coaching and mentoring a team of three people, having responsibilities for Data Assurance and Data Visualization
- Define new features for Credit Scoring process
- Data Modeling
- Design the appropriate data schema in order to persist data through data processing pipelines
- Design pipelines for Data Assurance and Data Cleaning
- Design and implement Data Visualization Tools for Monitoring Risk Assessment and the quality of Data as well
- Design and implement in Java a REST API for Real Time Credit Scoring.
Data Scientist
OPTASIA (CHANNEL VAS)
06.2017 - 02.2019
- Creating Scorecard Models for Credit Risk Assessment
- Utilizing distributed NoSQL databases (Mapr DB tables, parquet files etc.)
- Implementing scripts in Matlab for the feature retrieval process of the Risk Assessment and Profiling procedure
- Implementing the relevant Risk Strategies of the Credit Risk Assessment procedure in Matlab and Java as well
- Building Credit Risk Models using Matlab
- Building Tableau Dashboards for Credit Risk Assessment monitoring purposes
- Writing the definitions of the Variables that are used in the Risk Assessment process
- Credit Risk Profiling of the customers
- Time series analysis for analyzing kpis related to principal and outstanding metrics
- Design of database schemas for monitoring purposes and kpis visualization in Tableau.
Data Analyst
PERSADO
10.2015 - 03.2017
- Building Excel Reporting Dashboards for monitoring purposes
- Design and analysis of statistical experiments
- Utilizing databases and SQL (particularly PostgreSQL)
- Utilizing Data Mining techniques
- Implementing scripts in Python (NLTK, NumPy) for text analytics.
Education
BSc - Department of Mathematics, Applied Mathematics
University of Athens
Athens, Greece 01.2004 - 04.2009
BSc - Computer Science
Athens University of Economics And Business
Athens, Greece 01.2012 - 04.2018
MSc - Department of Informatics and Telecommunications, Computational Science
University of Athens
Athens, Greece 01.2009 - 04.2012
MSc - School of Electrical and Computer Engineering, Data Science and Machine Learning
National Technical University of Athens
Athens, Greece 01.2019 - 04.2023
Skills
Java (Springboot)
Matlab
Python
SQL (MySQL, PostgreSQL)
NoSQL (MongoDB, Mapr DB, Hbase, Hive)
Project Management
Project Coordination
Pyspark
Data Engineering
Data pipelines & Data Architecture
Research
- Institute of Biotechnology and Biomedicine, Barcelona, 06/2014, 12/2014, Internship, Dr. Xavier Daura, Developing application in C language for predicting protein-antibody interaction, Computational Biology, Machine Learning, Data mining in IEDB data for proteins
- NCSR Demokritos, Athens, 07/2013, Research centered summer school IRSS 2013, Bioinformatics, Computational Biology, Machine Learning - Transfer Learning
Languages
Greek
English
French
Publications
- Splice Site Recognition Using Transfer Learning, SETN 2014, Georgios Giannoulis, Anastasia Krithara, Christos Karatsalos, Georgios Paliouras, 341-353
- Attention-based method for categorizing different types of online harassment language, Joint European Conference on Machine Learning and Knowledge Discovery in Databases, Christos Karatsalos, Yannis Panagiotakis, 321-330, 1168, 2020
- Evaluation of Greek Word Embeddings, Proceedings of the 12th Language Resources and Evaluation Conference, Stamatis Outsios, Christos Karatsalos, Konstantinos Skianis, Michalis Vazirgiannis, 2543-2551, 2020
References
- Daura Ribera Xavier, Research Professor, ICREA Research Professor at UAB (Universitat Autònoma de Barcelona), +34 935868940, xavier.daura@uab.cat
- Michalis Vazirgiannis, Professor, LIX, École Polytechnique, 1 rue Honoré d'Estienne d'Orves, 91120 Palaiseau, France, +33 (0)1 77578056, mvazirg@lix.polytechnique.fr
Timeline
Data Architecture & Data Assurance Manager
OPTASIA (CHANNEL VAS)
06.2021 - 01.2022
Lead Data Architect
OPTASIA (CHANNEL VAS)
02.2019 - 06.2021
MSc - School of Electrical and Computer Engineering, Data Science and Machine Learning
National Technical University of Athens
01.2019 - 04.2023
Data Scientist
OPTASIA (CHANNEL VAS)
06.2017 - 02.2019
Data Analyst
PERSADO
10.2015 - 03.2017
BSc - Computer Science
Athens University of Economics And Business
01.2012 - 04.2018
MSc - Department of Informatics and Telecommunications, Computational Science
University of Athens
01.2009 - 04.2012
BSc - Department of Mathematics, Applied Mathematics
University of Athens
01.2004 - 04.2009
Director of Data Architecture & Data Assurance
OPTASIA (CHANNEL VAS)
1 2022 - Current
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