Eloi Ugo Pattaro, Developer in Berlin, Germany
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Eloi Ugo Pattaro

Verified Expert  in Engineering

Data Scientist and Developer

Location
Berlin, Germany
Toptal Member Since
August 1, 2022

Eloi Pattaro is a full-stack staff data scientist, well-versed in Python, SQL, PySpark, and cloud technologies (AWS, GCP, and Azure). Eloi's expertise includes data architecture, data mining, data visualization, and process automation. He has a strong background in leading data science teams and interfacing with marketing and product teams to improve efficiency. He is fluent in English and Portuguese and looks forward to adding value to your project.

Portfolio

Klarna
Python 3, Linux, Data Science, Data Analysis, Machine Learning, Python...
iFood
Linux, Machine Learning, Data Visualization, Project Design, Data Analysis...
Foxbit
Python 3, Amazon Web Services (AWS), Crypto, Data Analysis, Linux, Slack, Git...

Experience

Availability

Full-time

Preferred Environment

Amazon Web Services (AWS), Git, Artificial Intelligence (AI), Crypto, Data Analysis, Data Engineering, Data Science, Data Visualization, ETL, Machine Learning, Snowflake, Data Architecture, Statistical Analysis, Big Data

The most amazing...

...achievement I've had is updating a fraud prevention system, reducing the fraud rate from 3.5% to less than 0.3% and saving the company over $5 million a month.

Work Experience

Global Fraud Strategy Data Manager

2022 - 2022
Klarna
  • Identified a flaw with the company's authentication system and proposed a new algorithm that doubled the acceptance and conversion rates.
  • Detected and fixed key data integrity issues impacting models, analysis, and indicators.
  • Mentored and trained data scientists and analysts.
Technologies: Python 3, Linux, Data Science, Data Analysis, Machine Learning, Python, Time Series Analysis, Amazon Web Services (AWS), SQL, A/B Testing, Data Analytics, Slack, Git, Scientific Data Analysis, Science, Data Visualization, Natural Language Processing (NLP), Generative Pre-trained Transformers (GPT), Management, Project Design, Fraud Prevention, ETL, PostgreSQL, Artificial Intelligence (AI), Time Series, Cloud, Statistical Modeling, Data, Analytics, Quantitative Finance, Quantitative Risk Analysis, Data Cleaning, Unstructured Data Analysis, Large Data Sets, Data Scientist, Data Gathering, Spreadsheets, Web Scraping, Data Scraping, Scikit-learn, Pandas, Recommendation Systems, Cluster Analysis, Data Architecture, Statistical Analysis, Big Data

Decision Sciences Chapter Lead and Senior Manager

2019 - 2021
iFood
  • Led the anti-fraud department's data team during a chargeback crisis and reduced the chargeback by 90%, from over 3% to less than 30 basis points.
  • Proposed and assembled three new horizontal structures within the data domain, changing the structure from a single back office unit to squads across domains, which impacted over 80 employees.
  • Designed a new automated evaluation process based on graphs and reduced the performance evaluation time from two weeks to two days.
  • Made an FP&A cohort model, which resulted in the company changing how it spent a monthly $10 million marketing budget.
Technologies: Linux, Machine Learning, Data Visualization, Project Design, Data Analysis, Fraud Prevention, Logistics, Growth, Financial Planning & Analysis (FP&A), Python 3, Python, Data Science, Time Series Analysis, Amazon Web Services (AWS), SQL, A/B Testing, Data Analytics, Slack, Git, Scientific Data Analysis, Science, Generative Pre-trained Transformers (GPT), Natural Language Processing (NLP), Management, Technical Hiring, Hiring, Graphs, ETL, Databricks, PostgreSQL, Artificial Intelligence (AI), Time Series, Cloud, Data Engineering, Statistical Modeling, Data, Analytics, Quantitative Finance, Quantitative Risk Analysis, Data Cleaning, Unstructured Data Analysis, Large Data Sets, Data Scientist, Data Gathering, Spreadsheets, Web Scraping, Data Scraping, Scikit-learn, Pandas, Recommendation Systems, PySpark, Cluster Analysis, Data Architecture, Statistical Analysis, Big Data

Data Specialist

2017 - 2018
Foxbit
  • Recovered crucial customer data lost during a third-party platform provider (a white label solution) crash. This drastically mitigated any effects the crash may have caused on the company's customer base.
  • Detected a product flaw that allowed the customer to exploit its credit system. Over 100k USD and 30 BTC were recovered from customers abusing that product flaw.
  • Automated the financial reconciliation process the company had.
Technologies: Python 3, Amazon Web Services (AWS), Crypto, Data Analysis, Linux, Slack, Git, Scientific Data Analysis, Science, Data Science, Data Visualization, Natural Language Processing (NLP), Generative Pre-trained Transformers (GPT), Machine Learning, Project Design, ETL, Time Series Analysis, SQL, A/B Testing, Data Modeling, Time Series, Data Mining, Cloud, Data Engineering, Statistical Modeling, Azure, Data, Analytics, Quantitative Finance, Quantitative Risk Analysis, Data Cleaning, Unstructured Data Analysis, Large Data Sets, Data Scientist, Data Gathering, Spreadsheets, Web Scraping, Data Scraping, Scikit-learn, Pandas, Recommendation Systems, Data Architecture, Statistical Analysis, Big Data

Lead Data Scientist

2016 - 2017
Mira Educacao
  • Hired and structured a small team consisting of four data scientists and engineers.
  • Oversaw data engineering and data analytics projects and processes.
  • Built an Optical Mark Reader for the mobile app, which could scan and correct test sheets.
Technologies: Amazon Web Services (AWS), Python 3, ETL, Data Analysis, Machine Learning, Computer Vision, Data Visualization, Linux, Slack, Git, Scientific Data Analysis, Science, Data Science, Natural Language Processing (NLP), Generative Pre-trained Transformers (GPT), Management, Project Design, Technical Hiring, Hiring, Time Series Analysis, SQL, A/B Testing, PostgreSQL, Data Modeling, Artificial Intelligence (AI), Time Series, Data Mining, Cloud, Data Engineering, Machine Vision, Statistical Modeling, Data, Analytics, Data Cleaning, Unstructured Data Analysis, Large Data Sets, Data Scientist, Data Gathering, Spreadsheets, Web Scraping, Data Scraping, Scikit-learn, Pandas, Recommendation Systems, Data Architecture, Statistical Analysis, Big Data

Business Analyst

2016 - 2016
Nubank
  • Detected an issue in the company's underwriting model in which it misrepresented the operational cost of customers. As a result, the company was onboarding unprofitable customers, severely impacting its P&L.
  • Defined main KPIs for the new customer credit policies and built the monitoring tools and processes.
  • Perceived an issue with how the company grew its operational team and offered an alternative that reduced the customer experience cost by 60%.
Technologies: Python 3, Databricks, Linux, Amazon Web Services (AWS), MongoDB, PostgreSQL, SQL, Data Visualization, Data Analysis, Slack, Git, Scientific Data Analysis, Science, Data Science, Natural Language Processing (NLP), Generative Pre-trained Transformers (GPT), Project Design, ETL, Time Series Analysis, A/B Testing, Time Series, Cloud, Statistical Modeling, Data, Analytics, Quantitative Finance, Quantitative Risk Analysis, Data Cleaning, Unstructured Data Analysis, Large Data Sets, Data Scientist, Data Gathering, Spreadsheets, Web Scraping, Data Scraping, Scikit-learn, Pandas, Recommendation Systems, Data Architecture, Statistical Analysis, Big Data

iFood – Performance Evaluation Graph System

Created a graph-based system that decides who should evaluate the performance of other employees at the end of a cycle, enabling the company to automate a large part of its evaluation process and significantly increase efficiency.

iFood – Anti-fraud Decision Engine Refactoring

Collaborated with my team to reduce the complexity of a fraud prevention system, for which the company had a convoluted undocumented system that wasn't working as intended, and nobody knew why. We reduced over 500 policies to less than 20 while dramatically increasing the system's performance and lowering the 3.5% fraud rate to less than 0.3%.
2011 - 2016

Bachelor's Degree in Physics

Universidade de Sao Paulo - Sao Paulo, Brazil

Libraries/APIs

Scikit-learn, Pandas, PySpark

Tools

Spreadsheets, Git, Slack

Languages

Python 3, Python, SQL, Snowflake

Paradigms

Data Science, Management, ETL

Platforms

Amazon Web Services (AWS), Linux, Databricks, Azure

Storage

MongoDB, PostgreSQL

Other

Scientific Data Analysis, Science, Coding, Data Visualization, Machine Learning, Data Analysis, Project Design, Fraud Prevention, Technical Hiring, Hiring, Time Series Analysis, A/B Testing, Data Analytics, Data Modeling, Artificial Intelligence (AI), Time Series, Data Mining, Cloud, Data Engineering, Statistical Modeling, Data, Analytics, Quantitative Finance, Quantitative Risk Analysis, Data Cleaning, Unstructured Data Analysis, Large Data Sets, Data Scientist, Data Gathering, Web Scraping, Data Scraping, Recommendation Systems, Data Architecture, Statistical Analysis, Big Data, Physics, Natural Language Processing (NLP), Computer Vision, Logistics, Growth, Financial Planning & Analysis (FP&A), Graphs, Crypto, Machine Vision, Generative Pre-trained Transformers (GPT), Cluster Analysis

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