Roei Shtifelman-Zaady
Data Science Researcher at CBG - Cyber@Ben Gurion University- Claim this Profile
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English Native or bilingual proficiency
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Hebrew Native or bilingual proficiency
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Bio
Gintare Bendikaite
I highly recommend Roei as an employee. In the time I've known him, Roei has consistently been a strong employee — capable of taking control of projects and executing to the fullest. As well, he's a pleasure to work with. Roei is cheerful in the face of daunting deadlines and always available to lend a hand to co-workers when necessary. Also, he never counts his working hours and helps until it is needed. He was always willing to assist with any task. In addition, Roei was motivated and interested in learning. During his time on my team, he managed to build a lot of new automation and other improvements. Which helped to reduce processes handling time and quality.
Mark Faber
Roei is a really bright and highly motivated person with a great personality. He has continually shown interest and ability in finding ways to improve the way we work in the Chargeback Mitigation team, using a combination of process analysis and technology, which have had a direct impact on the key performance indicators for the team. Roei is always willing to help other team members and cooperates really well with other teams across the company all with his positive and happy disposition. I am sure Roei will be a great contributor and positive force in whatever company he joins.
Gintare Bendikaite
I highly recommend Roei as an employee. In the time I've known him, Roei has consistently been a strong employee — capable of taking control of projects and executing to the fullest. As well, he's a pleasure to work with. Roei is cheerful in the face of daunting deadlines and always available to lend a hand to co-workers when necessary. Also, he never counts his working hours and helps until it is needed. He was always willing to assist with any task. In addition, Roei was motivated and interested in learning. During his time on my team, he managed to build a lot of new automation and other improvements. Which helped to reduce processes handling time and quality.
Mark Faber
Roei is a really bright and highly motivated person with a great personality. He has continually shown interest and ability in finding ways to improve the way we work in the Chargeback Mitigation team, using a combination of process analysis and technology, which have had a direct impact on the key performance indicators for the team. Roei is always willing to help other team members and cooperates really well with other teams across the company all with his positive and happy disposition. I am sure Roei will be a great contributor and positive force in whatever company he joins.
Gintare Bendikaite
I highly recommend Roei as an employee. In the time I've known him, Roei has consistently been a strong employee — capable of taking control of projects and executing to the fullest. As well, he's a pleasure to work with. Roei is cheerful in the face of daunting deadlines and always available to lend a hand to co-workers when necessary. Also, he never counts his working hours and helps until it is needed. He was always willing to assist with any task. In addition, Roei was motivated and interested in learning. During his time on my team, he managed to build a lot of new automation and other improvements. Which helped to reduce processes handling time and quality.
Mark Faber
Roei is a really bright and highly motivated person with a great personality. He has continually shown interest and ability in finding ways to improve the way we work in the Chargeback Mitigation team, using a combination of process analysis and technology, which have had a direct impact on the key performance indicators for the team. Roei is always willing to help other team members and cooperates really well with other teams across the company all with his positive and happy disposition. I am sure Roei will be a great contributor and positive force in whatever company he joins.
Gintare Bendikaite
I highly recommend Roei as an employee. In the time I've known him, Roei has consistently been a strong employee — capable of taking control of projects and executing to the fullest. As well, he's a pleasure to work with. Roei is cheerful in the face of daunting deadlines and always available to lend a hand to co-workers when necessary. Also, he never counts his working hours and helps until it is needed. He was always willing to assist with any task. In addition, Roei was motivated and interested in learning. During his time on my team, he managed to build a lot of new automation and other improvements. Which helped to reduce processes handling time and quality.
Mark Faber
Roei is a really bright and highly motivated person with a great personality. He has continually shown interest and ability in finding ways to improve the way we work in the Chargeback Mitigation team, using a combination of process analysis and technology, which have had a direct impact on the key performance indicators for the team. Roei is always willing to help other team members and cooperates really well with other teams across the company all with his positive and happy disposition. I am sure Roei will be a great contributor and positive force in whatever company he joins.
Credentials
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Sequences, Time Series and Prediction in TensorFlow
DeepLearning.AIOct, 2023- Nov, 2024 -
Natural Language Processing in TensorFlow
DeepLearning.AISep, 2023- Nov, 2024 -
Cluster Analysis in Python
DataCampMay, 2023- Nov, 2024 -
Feature Engineering for Machine Learning in Python
DataCampMay, 2023- Nov, 2024 -
Introduction to TensorFlow in Python
DataCampMay, 2023- Nov, 2024 -
Extreme Gradient Boosting with XGBoost
DataCampApr, 2023- Nov, 2024 -
Introduction to Deep Learning in Python
DataCampApr, 2023- Nov, 2024 -
Linear Classifiers in Python
DataCampApr, 2023- Nov, 2024 -
Machine Learning with Tree-Based Models in Python
DataCampApr, 2023- Nov, 2024 -
Unsupervised Learning in Python
DataCampMar, 2023- Nov, 2024 -
ICH Good Clinical Practice E6 (R2)
The Global Health NetworkFeb, 2023- Nov, 2024 -
Data Cleaning in Python
KaggleJan, 2022- Nov, 2024 -
Feature Engineering
KaggleJan, 2022- Nov, 2024 -
Advanced SQL Using Big Query
KaggleDec, 2021- Nov, 2024 -
Data Visualization
KaggleDec, 2021- Nov, 2024 -
Intro to Deep Learning
KaggleDec, 2021- Nov, 2024 -
Intermediate Machine Learning
KaggleNov, 2021- Nov, 2024 -
Intro to AI Ethics
KaggleNov, 2021- Nov, 2024 -
Intro to SQL Using Big Query
KaggleNov, 2021- Nov, 2024 -
Introduction to Data Science in Python
University of MichiganNov, 2021- Nov, 2024 -
Intro to Machine Learning
KaggleOct, 2021- Nov, 2024 -
Introduction to Programming Using Python
KaggleOct, 2021- Nov, 2024 -
Pandas
KaggleOct, 2021- Nov, 2024 -
Python Programming for Beginners in Data Science
UdemyAug, 2021- Nov, 2024 -
Developing Your Emotional Intelligence
LinkedInSep, 2020- Nov, 2024 -
Interpersonal Communication
LinkedInSep, 2020- Nov, 2024 -
Data Science with Python
SoloLearnAug, 2020- Nov, 2024
Experience
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CBG - Cyber@Ben Gurion University
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Israel
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Research Services
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1 - 100 Employee
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Data Science Researcher
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Mar 2023 - Present
NLP - Handling Adversarial Attacks in Large Language Models (GPT). NLP - Handling Adversarial Attacks in Large Language Models (GPT).
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Clalit Innovation
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Israel
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Hospitals and Health Care
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1 - 100 Employee
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R&D Data Analyst - The Department of AI Based Medicine
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Sep 2022 - Mar 2023
C-Pi is a in-house personalized healthcare system designed to create a set of custom recommendations, referrals, and medication plans for patients based on live data. Enabling physicians an in-depth picture of the patient and a medical plan according to the latest medical guidelines available. Working on the world's single largest healthcare database, my role includes: - Creation of big-data SQL ETLs that form tailor-made medical plans for over 2 million patients of Clalit Health Services. - Algorithm development - planning, execution and testing. - A/B testing the impacts of different treatments to various medical conditions. - Working with Data Scientists to create features for ML models and implement the models' predictions into the system. Show less
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Simplex
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Israel
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Financial Services
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100 - 200 Employee
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Senior Chargeback Specialist
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Dec 2021 - Sep 2022
Data Analyst & Project Manager.E2E Data Analysis using SQL, Python, Qlik & A/B testing that lead to cross-company changes in the product, processes & the database.Constant contact with multiple departments, acquiring banks and partners.BI Dashboards and ETLs development.Taking initiative to share and implement new ideas and solutions while thinking beyond the confines of traditional practices to recognize opportunities.Reaching team level efficacy improvements worth hundreds of thousands of USDs a year.Notable Work:- Analysis of effectiveness of existing assumptions that lead to a time-reduction of 30% in internal processes.- Analysis of product features that lead to a change in the company's main product, resulting in higher customer satisfaction and lower dispute rate.- Automation using Python & SQL of the creation of financial reports that lead to a time-reduction of 99%.-Analysis and creation of a one-stop-shop query which retrieves all setup data needed for analysis in one place, saving 2100 work hours a year. - Analysis and creation of an SQL & Python based ETL that resulted in the savings of 260 hours worth of work per year. Show less
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Chargeback Specialist
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Jan 2021 - Dec 2021
Fraud Analysis. Investigating, analyzing, and mitigating fraudulent chargeback claims related the exchange of cryptocurrency for fiat, while following strict Visa & Mastercard regulation.Direct communication with international acquiring banks.Writing complex SQL queries, using Salesforce, Qlik & advanced Excel features.
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SCE - Shamoon College of Engineering
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Israel
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Higher Education
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200 - 300 Employee
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Undergraduate Teaching Assistant
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Oct 2021 - Sep 2022
Teaching the course 'Data Science' - Advanced statistical analysis of real world data using R. Teaching the course 'Data Science' - Advanced statistical analysis of real world data using R.
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Education
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Ben-Gurion University of the Negev
M.Sc Software and Information Systems Engineering, Machine Learning and Big-Data Analytics -
SCE - Shamoon College of Engineering
B.Sc Industrial Engineering and Management, Information Systems